Chandana Napagoda - Java, Eclipse,Maven and Other Programming Tips

Introduction to OSGi - 2 (OSGi Services)

2012-01-03T09:49:00.003+05:30

There are so many OSGi tutorials, blogs, and samples. I am going to add another OSGi sample/tutorial with my OSGi leanings. Here is my previous article regarding OSGi(Introduction to OSGi).

An OSGi Service is a java object instance which is registered with OSGi framework with set of attributes. Services can be accessed via service registry(performed via the class BundleContext). BundleActivator is to be invoked on start and stop. When BundleActivator call start method we are going to register our service. After that any bundle can access that service.

Service Bundle:

In service bundle you need to export your service and need to register it via service registry. When we are exporting service we export interface package only. As usual that is to hide the implementation from the other bundles.

I have created a sample OSGi project called HelloServcie

MANIFEST.MF

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: HelloService
Bundle-SymbolicName: com.chandana.hello.HelloService
Bundle-Version: 1.0.0
Bundle-Activator: com.chandana.hello.helloservice.Activator
Bundle-Vendor: CHANDANA
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Import-Package: org.osgi.framework;version="1.3.0"
Export-Package: com.chandana.hello.service
Bundle-ActivationPolicy: lazy

Service Interface:

public interface  HelloService {    
    public String helloMethods();
}

Service Implementation:

public class HelloServiceImpl implements HelloService {
    @Override
    public String helloMethods() {
        String retValue = "Inside Hello Service method";
        return retValue;
    }
}

Boundle Activater:

public class Activator implements BundleActivator {
    ServiceRegistration serviceRegistration;
    /*
     * (non-Javadoc)
     * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
     */
    public void start(BundleContext context) throws Exception {
        System.out.println("Bundle Started.....!!!!!");
        HelloService service = new HelloServiceImpl();
        serviceRegistration = context.registerService(HelloService.class.getName(), service,null);
    }
    
    /*
     * (non-Javadoc)
     * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
     */
    public void stop(BundleContext context) throws Exception {
        System.out.println("Bundle Stoped.....!!!!!");
        serviceRegistration.unregister();
    }
}

When we are using published services, we can import it from another Bundle. So need to create another Plug-In-Project for HelloClient

Bundle Context

Bundle context is the context of a single bundle within the OSGi runtime and it is created when Bundle get started. Bundle context can be used to Install new bundles, Obtain registered services by other bundles and Register services in the framework.

MANIFEST.MF

Import-Package: org.osgi.framework;version="1.3.0",com.chandana.hello.service

After importing the bundle, you can access the service. Important thing is service can be accessed only through bundle context. You can get actual service object via BundleContext.getService() method .

Activator class:

public class Activator implements BundleActivator {
     ServiceReference serviceReference;     
    /*
     * (non-Javadoc)
     * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
     */
    public void start(BundleContext context) throws Exception {
        serviceReference= context.getServiceReference(HelloService.class.getName());
        HelloService helloService =(HelloService)context.getService(serviceReference);
        System.out.println(helloService.helloMethods());
    }
    
    /*
     * (non-Javadoc)
     * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
     */
    public void stop(BundleContext context) throws Exception {
        context.ungetService(serviceReference);
    }
}

context.getServiceReference() method return the HelloService OSGi service reference and Using that service reference can access the actual service object.

For Run this project click on Run --> Run Configuration , In OSGi Framework Right click and create new Run Configuration. Make sure HelloService and HelloClient .

Issues:
What happened if the service is not started when client is accessing the service?
What happened if you have stopped the service bundle?

Code Repo:
http://code.google.com/p/osgi-world/source/browse/#svn/trunk/com.chandana.hello.HelloService
http://code.google.com/p/osgi-world/source/browse/#svn/trunk/com.chandana.hello.HelloClient

How to Ignore Files or Directories in Subversion

2011-12-13T10:00:00.001+05:30

We are facing a common problem when trying to commit some changes to the SVN. That is each time we have to ignore some JAR files, because those JAR files are user run time specific and if they are committed, it would not work on other local runtimes.

Here is a pretty simple solution for this problem. We can tell subversion to ignore directories or specific files as follows.

Ignore directories or specific files.
svn propedit svn:ignore ./some_path

It will ignore all files in the specified directory. Here only wildcard indication is supported, and regular expressions are not supported.

Example wildcard supprt:

svn propedit svn:ignore *

Example ingnore class files with wildcard:

svn propedit svn:ignore *.class

If you are using Eclipse SubEclispe plugin,

Right Click file or folder --> Team --> Then click on svn:ignore

How to debug using Maven Jetty

2011-11-10T19:25:00.000+05:30

Debugging is a better approach to find out bugs in our programs. Here is a way to debug a maven project, and I am going to run my web application in the Jetty server.

First you need to add the following environmental variables on your Windows/Linux environment.

MAVEN_OPTS = -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=4000,server=y,suspend=y

Now go to your maven web project location through command line and start the jetter server -> mvn jetty:run

Now in eclipse debug configuration, add a remote Java application instance on port 4000. Then Add some debug points to your codes and start the remote app instance on debug mode. You can see the steps from following screen shots.

In this manner you can debug your java web apps and find out the bugs. With this way you can debug your java web app.

if you are using maven latest version( Maven 2.0.8 or later)

run the

 mvnDebug

command instead of

mvn

and attach a debugger on port 8000.

Love to hear from you! feedback(comments) are always welcome

Google Cloud SQL, Hibernate JPA Support

2011-10-25T13:53:00.000+05:30

With my last post about Google Cloud SQL(Google App Engine) with Spring Hibernate, many people had encountered the same issue about HIbenrate JPA. If you are developing Hibernate JPA based applications,there is some issues with Hibernate JPA support which you need to be awared.

When you are running the application you may get an error like this:

java.lang.NoSuchMethodError: javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;

This is because Hibernate used JPA 2.0 specification. But Google App Engine only support JPA 1.0 specification. I also got the same issue, and therefore I used Spring Hibernate support (instead of Hibernate JPA).

"The App Engine Java SDK includes an implementation of JPA 1.0 for the App Engine datastore"
Google App Engine JPA : http://code.google.com/appengine/docs/java/datastore/jpa/

Love to hear from you! feedback(comments) are always welcome

Google Cloud SQL with Struts, Spring and Hibernate

2011-10-17T21:39:00.000+05:30

With Google App engine SDK 1.5.5, Google have introduced Google Cloud SQL for GAE (Currently we can't connect any other external application with Google Cloud SQL. This can be only with Google App Engine Apps).

It's faster than connecting with Amazon RDS and other Cloud based Data solutions. No need to worry about load balancing as well. Cloud SQL supports 5 QPS read/write rate, so as long as you don't go over that, you can use cloud SQL. If you are going over this read/write rate limit, datastore might become a much more effective approach to you.If you are storing large blobs data(images, attchments and sound files, it's better storing them in the datastore or blobstore.

When Google App Engine became populer in late 2009 many people asked about Hibernate support. But with their datasore people were unable to develop Hibernate support applications with GAE. But with Google Cloud SQL developers can use Hibernate supported applications as well.

Last week I shared my first application which was developed with Google Cloud SQL. It was only a JSP and Servlet based web application. Afterwards I mainly focused on developing a Struts, Spring & Hibernate based application and deploying it to Google App Engine where the data source is Cloud SQL.

In Last weekend I got a time to focus on this idea. So finally I have deployed my Struts, Spring and Hibernate based application in to GAE and it's data source( Database) is Google Cloud SQL. If you are migrating your existing Spring Hibernate based application in to GAE and Cloud SQL, there is not much to do.

Only need to change data source and driver name. If you need more clarification, feel free to contact me.

Try out my application http://mycloudsql.appspot.com

Source Code(CloudSQLSample2) : http://code.google.com/p/cloudsql/

My Previous Post: http://cnapagoda.blogspot.com/2011/10/sample-application-with-google-cloud.html
Cloud SQL Doc: https://code.google.com/apis/sql/

Google App Engine and Cloud SQL will be revolutions of Cloud Computing. (updated 01-11-2011)

Sample Application with Google Cloud SQL

2011-10-12T12:02:00.000+05:30

Three months ago I was able to participate in one of the Google App Engine based task management project. However, in that project, I had to face some critical issues in searching as Google Datastore did not support many search options including LIKE search. It is known that searching is one of the essential parts of the enterprise applications.

However, Google introduced Cloud SQL last week and they approved my "Google Cloud SQL" request today (they took 5 days to approve it.:D ). Once they approved, I decided to develop a sample application with Cloud SQL. Gogole Cloud SQL database engine is MySql Version 5.1.59 and database size must be no larger than 10GB. Here I have added option to Test LIKE search. If you need more clarification, feel free to contact me.

Test Application http://securezilla.appspot.com/

PS: Added Source Code
Sample Project : http://code.google.com/p/cloudsql/

New Post : Google Cloud SQL with Spring and Hibernate

Added on 2011-10-20:

Some people have issue when developing their application because Google currently doesn't support access Google Cloud SQL from outside Google App Engine. there for your local development you need to test with local DataBase(EX: Mysql). After that you when code release to Google App engine it's work fine.

For you local development no need to change the connection URLs.Just need to pass the VM arguments . I think you are using Eclipse IDE.

Go to Run --> Run Configurations
Add the following lines into the your project VM Arguments section.

-Drdbms.server=local
-Drdbms.driver=com.mysql.jdbc.Driver
-Drdbms.url=jdbc:mysql://localhost:3306/database?user=dbuser&password=dbpass

After that add MySql JDBC driver in to your App Engine SDK/lib/impl folder. Then create DataBase and tables for according to requirement.

Introduction to OSGi(Java Modular)

2011-09-11T10:07:00.000+05:30

OSGi Alliance is the governing body of this stranded and it was started at 1999. their initial goal was create open stranded for network devices. Based on this idea this specification introduced for Java also. Eclipse was first in Java. they introduced OSGi based Eclipse IDE at 2004 June.

OSGi is way to define dynamic module in java. There are main three OSGi container implemented for Java,such as Apache Felix, Eclipse Equinox and Knopflefish.

Why OSGi? Because OSGi provide ability to divided application in to multiple module and those module easy to manage with other dependencies. other than that is very easy to install, update,stop and delete module without stop engine(Ex: Tomcat web application container). We can have multiple version of implementation with effecting to other references.

There are main 3 layers in web based Java framework(Presentation , Business layer and DAO layer). There we can divide it into three OSGi based module. then we can very easily fixed bug in one layer with out effecting to others and restarting our Web container. Just we need to update out module.

in OSGi world output is bundle, it can be either Jar or War file. A bundle consists of Java classes and other resources that with some additional metadata (providing services and packages to other bundles).

I am going to use Eclipse IDE for create my first bundle. Because Eclipse IDe has built in Equinox container(every eclipse plugins are OSGi bundles) .

Create Eclipse Plug-In-Project

Go to New--> Other --> Plug-In-Project and click on Next then new project creation dialog will be appeared

Provide project name and Target platform as below. and Click on Next

com.chandana.Hello.HelloWorld

Stranded OSGi

In next screen you can change bundle information(These information available in MANIFEST.MF and I will give details information later) then click on Next button.

After that OSGi project template selection dialog will be appear.There select Hello OSGi Bundle and click on Finish

After few second Eclipse will generate Hello World Plug-In-Project(I had Not responding few second :) )

In my project structure is like this:

Activator.java

package com.chandana.hello.helloworld;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;

public class Activator implements BundleActivator {

 /*
  * (non-Javadoc)
  * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
  */
 public void start(BundleContext context) throws Exception {
  System.out.println("Hello World!!");
 }
 
 /*
  * (non-Javadoc)
  * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
  */
 public void stop(BundleContext context) throws Exception {
  System.out.println("Goodbye World!!");
 }

}

Activator is class which implement BundleActivator interface. It has stop and start methods. those methods are called when a bundle is started or stopped. This bundle activator class specify in MENIFEST.MF file(Bundle-Activator entry).

Start Method:

The OSGi container calls start method when bundle is starting. We can use this start method for initialized database connection, register a service for other bundle use.

Stop Method:

The OSGi container calls stop method when bundle is stopping. We can use this method for remove services form service registry like clean up process

MANIFEST.MF

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: HelloWorld
Bundle-SymbolicName: com.chandana.Hello.HelloWorld
Bundle-Version: 1.0.0.qualifier
Bundle-Activator: com.chandana.hello.helloworld.Activator
Bundle-Vendor: CHANDANA
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Import-Package: org.osgi.framework;version="1.3.0"

Bundle-ManifestVersion

Bundle-ManifestVersion header show the OSGi container that this bundle follows the rules of the OSGi specification. A value of 2 means that the bundle is compliant with OSGi specification Release 4; a value of 1 means that it is compliant with Release 3 or earlier.

Bundle-Name

Bundle-Name header defines a short readable name for bundle.

Bundle-SymbolicName

Bundle-SymbolicName header specifies a unique name for the bundle. This is the name you will use while referring a given bundle from other bundles.

Bundle-Version

Bundle-Version header is the version number of the bundle.

Bundle-Vendor

Bundle-Vendor header is description of the vendor(foe example it's my name).

Import-Package

Import-Package is indicate what are the other Java bundle(OSGi) required for this bundle. what we called dependency.

Export-Package

Export-Package is indicate what are public packages in bundle and those Export-Package can import from other bundle.

Run the Bundle:

For Run this project click on Run --> Run Configuration , In OSGi Framework Right click and create new Run Configuration.

First unchecked the all target platform and Click on Add Required Bundles.
After that Apply the changes and Run the project by click in Run button.
After Run the project OSGi console display like below.

OSGi Terminal Commands:

start      - start the specified bundle(s)

stop       - stop the specified bundle(s)

uninstall  - uninstall the specified bundle(s)

update     - update the specified bundle(s)

refresh    -  refresh the packages of the specified bundles

b          - display details for the specified bundle(s)

headers    - print bundle headers

services   -  display registered service details

Source Code

In My Next post I will describe how to create dependency based OSGi bundle.

Advanced Java questions -4

2011-08-23T22:33:00.005+05:30

A program which will accept three sentences (one sentence per line) and print the words having Initial Caps within the sentences. Below is an example.

Here is an example. If the below three sentences are given to the program as input,

This is a Program
Coding test of Initial Caps
the program Will Test You

Then, the output would look like:

This
Program
Coding
Initial
Caps
Will
Test
You

Solution:
Pattern p = Pattern.compile("^[A-Z]");

Advanced Java questions -3

2011-08-23T22:18:00.001+05:30

Where 1999 is the year and 5 is the numeric sequence of the month (corresponding to June). The program should display the day on which June 28, 1999 fell, and in this case the output will be MONDAY.

The output should be displayed in uppercase letters.

Suppose the following INPUT sequence is given to the program:

1999-5
1998-6

Then the output should be:

MONDAY
TUESDAY

Solution:

import java.text.DateFormatSymbols;
import java.util.Calendar;
import java.util.Scanner;


public class Solution {

 /**
  * @param args
  */
 public static void main(String[] args) {
  boolean condition = false;
  do {
   Scanner scanner = new Scanner(System.in);
   String value = scanner.nextLine();
   condition = value.equalsIgnoreCase("exit");
   if(!condition && value.contains("-")){
    calculate(value);
   }
   System.out.println("Count is: " + condition);
  } while (!condition);


 }

 private static void calculate(String value) {
  final String[] input = value.split("-");
  Calendar cl = Calendar.getInstance();
  cl.set(Integer.parseInt(input[0]), Integer.parseInt(input[1]), 28);
  String[] weekdays = new DateFormatSymbols().getWeekdays();
  System.out.println(weekdays[cl.get(Calendar.DAY_OF_WEEK)].toUpperCase());
  
 }

}

Advanced java questions -2

2011-08-23T22:00:00.000+05:30

Write a program that prints the numbers between 258 and 393 (both inclusive) which do not end with 5. The program should print the output so as to have one value per line. The output would therefore follow the below format:

value1
value2
value3
.
..
.
so on
Solution:

public class Solution2 {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  int start = 258;
  int end = 393;
  for (int i = start; i < end; i++) {
   if(i%10 !=5){
    System.out.println(i);
   }
   
  }

 }

}

Advanced Java questions

2011-08-23T21:53:00.002+05:30

A program which will accept a single pair of strings separated by a comma; the program should calculate the sum of ASCII values of the characters of each string. The program should then subtract the sum of the ASCII values of the second string from the sum of the ASCII values of the first string.

Suppose the following input is given to the program:

123ABC,456DEF

Then the sum of the ASCII values of the characters in '123ABC' is 348 and in '456DEF' it is 366. The Difference between these numbers is 348 – 366 = -18
The corresponding output to be printed by the program is:

-18

Solution:

import java.util.Scanner;



public class Solution {

 /**
  * @param args
  */
 public static void main(String[] args) {
  boolean condition = false;
  do {
   Scanner scanner = new Scanner(System.in);
   String value = scanner.nextLine();
   condition = value.equalsIgnoreCase("exit");
   if(!condition && value.contains(",")){
    calculate(value);
   }
  } while (!condition);

 }
 
 private static void calculate(String value){
   
   
   
   final String[] event1 = value.split(",");
   int ss = 0;
   for ( int i = 0; i < event1[0].length(); ++i ) {
          char c = event1[0].charAt( i );
          ss += (int) c;
          //System.out.println(skype);
         }
   int sd = 0;
   for ( int i = 0; i < event1[1].length(); ++i ) {
          char c = event1[1].charAt( i );
          sd += (int) c;
          //System.out.println(sd);
         }
   System.out.println(ss-sd);
  
 }

}

Google App Engine DataNucleus “does not seem to have been enhanced” Issue

2011-05-19T11:48:00.004+05:30

I got DataNucleus exception while developing a Google App Engine based Web Application for one of my office clients. Here is the error message.

javax.jdo.JDOUserException: Persistent class 
"Class com.xxxxx.xxxxx.domain.XXXXXUser does not 
seem to have been enhanced. You may want to rerun the
enhancer and check for errors in the output."
has no table in the database, but the operation requires it.
Please check the specification of the MetaData for this class.
 at 

org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:375)
 at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:252)

NestedThrowablesStackTrace:

Persistent class "Class com.xxxxx.xxxxx.domain.XXXXXUser
does not seem to have been enhanced.
You may want to rerun the enhancer and 
check for errors in the output." has no table in the database,
but the operation requires it.Please check the specification
of the MetaData for this class. org.datanucleus.store.exceptions.NoTableManagedException: 
Persistent class "Class com.xxxxx.xxxxx.domain.XXXXXUser does 
not seem to have been enhanced.You may want to rerun the enhancer 
and check for errors in the output."has no table in the database,
 but the operation requires it. 
Please check the specification of the MetaData for this class.

Every time when i am getting the latest version form version control, GAE shows the error. As a solution I had to cut and paste all persistent classes. There were about 30 persistent(Domain) classes.
Finally I found the solution for this issue. There is a special configuration in GAE eclipse plug-in which need to be done, to run the datanucleus enhancer.

Go to:
Project Settings -> Google -> App Engine -> ORM

Then remove default value(src/) and configure the source path to persistent file or folder like this:

How to parse toString date value to Date object

2011-05-05T11:33:00.000+05:30

I have some issue with toString date value parse to Date object. here is my solution for that.

     try {
 Date cutterntTime = new Date();
 String dateStringValue = cutterntTime.toString();
 //String dateStringValue = Thu May 05 11:26:49 IST 2011;
 DateFormat formatter = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy");
 Date date = (Date)formatter.parse(dateStringValue);

 System.out.println("Date Value is : " + date);
     } catch (ParseException e){
 System.out.println("Exception :"+e);
     }

How do I get dates between two dates?

2011-03-28T12:22:00.001+05:30

In the following example code I am going to get dates between two dates. First, I need to convert the date value into milliseconds and increase startup date value from one date.

One date in milliseconds equlas to 24 * 60 * 60 * 1000L

import java.util.*;

public class DateUtil {
 static final long ONE_DAY = 24 * 60 * 60 * 1000L;

 public static void main(String[] args) {
  getDatesBetween("03/23/2011","03/28/2011");

 }

 public static void getDatesBetween(String startDate,String endDate) {


        long  from=Date.parse(startDate);  // long value of from date

        long to=Date.parse(endDate);     // long value of to date

        int x=0;

        while(from <= to) {
              x=x+1;
              System.out.println ("Dates  : "+new Date(from));
              from += ONE_DAY;
        }
        System.out.println ("No of Dates  :"+ x);


 }


}

Java Hex Color Code Generator

2011-03-28T11:29:00.002+05:30

Last week I got an ideas on a random color generator in Java. One of my friends asked me to implement this logic.

Here is my example hexadecimal color code generate logic.

public Map hexCodeGenerator(int colorCount){
  int maxColorValue = 16777215;
  // this is decimal value of the "FFFFFF"

  int devidedvalue = maxColorValue/colorCount;

  int countValue = 0;

  HashMap hexColorMap = new HashMap();

  for(int a=0; a < colorCount && maxColorValue >= countValue ; a++){
   if(a != 0){
    countValue+=devidedvalue;
    hexColorMap.put(a,Integer.toHexString( 0x10000 | countValue).substring(1).toUpperCase());

   }else{
    hexColorMap.put(a,Integer.toHexString( 0x10000 | countValue).substring(1).toUpperCase());
   }



  }
  return hexColorMap;

 }

Or You can use Math.random also. Here is example using Math.random

public static Map randomCodeGenerator(int colorCount){
  HashMap hexColorMap = new HashMap();
  for(int a=0;a < colorCount; a++){
   String code = ""+(int)(Math.random()*256);
   code = code+code+code;
   int  i = Integer.parseInt(code);

   
   hexColorMap.put(a,Integer.toHexString( 0x1000000 | i).substring(1).toUpperCase());
  }
 return hexColorMap;
 }

help my site stand out :

Java HTTPS Client

2011-02-23T10:08:00.001+05:30

Here is example for a Java HTTPS client

import java.net.URL;
import java.io.*;
import javax.net.ssl.HttpsURLConnection;

public class HttpsClient{
  public static void main(String[] args) throws Exception{
    String httpsURL = "https://encrypted.google.com/";
    URL myurl = new URL(httpsURL);
    HttpsURLConnection con = (HttpsURLConnection)myurl.openConnection();
    InputStream ins = con.getInputStream();
    InputStreamReader isr = new InputStreamReader(ins);
    BufferedReader in = new BufferedReader(isr);

    String inputLine;

    while ((inputLine = in.readLine()) != null) {
      System.out.println(inputLine);
    }

    in.close();
  }
}

How to Unlock Any Huawei Modem

2010-08-28T13:13:00.005+05:30

1). - Find the IMEI number

2). type this on web browser | http://bb5.at/huawei.php?imei=DEVICE_IMEI

3). Unlock code should display like this
IMEI: XXXXXXXXXXXXXXXXXX
» Unlock: 61949385
» Flash: 46034704
(c) SERGEY/MKL 2010

4). Enter the unlock code in Unlocker or Any Unlocking Software and Unlock the Device

This is totally free Don't waste your money on Unlocking software

Softwares:
Unlocker 1
Unlocker 2

Doc

>

Mobitel MMS Settings For Android

2010-08-13T12:44:00.004+05:30

Setting up the handset for Internet

Select Settings.
Select Wireless & networks or Wireless controls (older versions).
Select Mobile networks.
Select Access point names.
Press the Menu, --> New APN
Select enter Name (Mobitel or something). Press ok
APN: mobitel3g or mobitelbb and press OK.
Select, APN type, enter internet or default and press OK.
Other information not necessary.
Press the Menu and select Save.

Setting up the handset for MMS

On the handset, press the Menu key.
Select Settings.
Select Wireless & networks or Wireless controls (older versions).
Select Mobile networks.
Press the Menu, enter Mobitel MMS or something.
APN: wapmms and press OK
Scroll to, and select, Proxy, enter 192.168.050.163 and press OK.
Scroll to, and select, Port, enter 8080 and press OK.
Scroll to, and select, User name, enter Not Required and press OK.
Scroll to, and select, Password, enter Not Required and press OK.
Scroll to, and select, MMSC, http://192.168.050.165 and press OK.
Scroll to, and select, MMS Proxy, 192.168.050.163 and press OK.
Scroll to, and select, MMS Port , 8080 and press OK.
Scroll to, and select, APN type, enter mms and press OK.
Press the Menu and select Save.

help my site stand out :

Secure SMS Android Application

2010-07-17T13:16:00.001+05:30

What is Secure SMS?

Secure SMS is a Messaging application which provides you a Secure SMS messaging service. You can send and receive Secure SMS via this application. Messages can be sent to a person who has this Secure SMS app and to a person who does not has this app.

User can configure application password when application opened in first time.

Inbox

Inbox will show you, the Messages which received by you from Secure SMS application or from configured number. You can delete inbox message by Context Menu(To show a context menu on long click). By clicking on each message you can view full message body, sender and sent time.

OutBox

Outbox will show you, the Messages which sent by you. You can delete inbox message by Context Menu(To show a context menu on long click). By clicking on each message you can view full message body , receiver and sent time.

Send SMS

When you are sending a SMS you can directly type receiver's number or you can select from "Select Contact" menu. If receiver is your Non Secure SMS number then message send as normal SMS and it will skip you normal SMS conversations. Otherwise message will be send as Secured SMS. That message content will be encrypted and never be able to break it content.

Change Application Preferences

You can change your application password through help icon.Help icon will display in top right corner. Click on preference menu for configure Application notification and add non Secure SMS number.

My First Android Application

2010-07-10T18:07:00.003+05:30

What is android:
Android is a Linux based Mobile Operating system, which developed by Google's.

Two weeks ago I published my first Android Application. I called it as Zip/ Postal code Catcher. Why I have used Zip/ Postal ?? Because some countries Use Postal code, and some countries called it as Zip code.Then I named it as Zip/ Postal Code Catcher. Zip/ Postal Code Catcher is a free android application.

Application Features :

Search Postal codes over 30 countries.
If Provided city name does not match, then it will display the nearest matching postal codes.
Using GPS based Postal code search option, you can find the nearest five post-office codes(sorted with air distance)

This Application totally based on JSON web service access. In My first release GPS based postal code catching option is not included. But last Thursday, I have added GPS based postal code search option. By the way, currently it is being used by 707 users :) .

Zip/ Postal Code Catcher Information In Androlib...

Spring-Hibernate Maven project- Part 3

2010-01-28T16:29:00.006+05:30

Hibernate Configuration and Project Deployment

In the previous post I created the hibernate mapping files for the Person-Address domain classes. In here we are going to create the hibernate configuration file which creates the database connection according to the defined URL, credentials and other properties.

On the deplyment of the project, the hibernate configuration file is executed through the commands in pom.xml.

We have to put the hibernate configuration file inside the src/main/resources directory. For that right cick on the directory, select new, select other. From there expand the hibernate icon and select Hibernate Configuration file (cfg.xml).

Click Next

Keep the default name "hibernate.cfg.xml" same and click Next
Give the values in the appeared window give the values as follows.

Make sure to verify your mysql username and password, and enter the corret one according to your mysql configuration.

hibernate.cfg.xml


    
        
com.mysql.jdbc.Driver
        
root
        
jdbc:mysql://localhost:3306/testdb1
        
root
        
org.hibernate.dialect.MySQLDialect

Add the mapping resource entries to your hibernate.cfg.xml file as above.
Here is the directory structureof the project after the hibernate.config.xml file is being added.

Let's add the build elements to the pom.xml file to execute the mapping files and create the tables accordingly.

append the following etries to the pom.xml file inside the project tags.


  
   
    org.apache.maven.plugins
    maven-compiler-plugin
    
     1.5
     1.5
    
   
   
    maven-resources-plugin
   
   
    org.apache.maven.plugins
    maven-eclipse-plugin
    2.7
   
   
    org.codehaus.mojo
    hibernate3-maven-plugin
   
   
    org.apache.maven.plugins
    maven-source-plugin
    
     target
     
     false
    
    
     
      make-source-jar
      package
      
       jar
      
     
    
   
   
    org.codehaus.mojo
    hibernate3-maven-plugin 
    
    2.2
    
     
      process-classes
      
       hbm2ddl
      
     
    
    
     
      hsqldb
      hsqldb
      1.8.0.7
     
     
      mysql
      mysql-connector-java
      5.1.6
     
    
    
     
      hbm2ddl
     
     
      target/classes/hibernate.cfg.xml 
      
      schema.sql
      true
      true
      true
      false
     
    
   
   
    maven-checkstyle-plugin

It is ready to execute the project and one more thing left. Go to mysql command line and create a database called testdb1.

Deploying the project

Right click on the project and goto run as--maven install

In the maven console you can examine the execution. It will display the sql of the tables created. If you have followed the things correctly at the end it will display BUILD SUCCESSFUL.

Inside the target directory hibernate/sql will contain the scema.sql file which is a dump file of the created tables. Also the jar files are created. (testapp-0.0.1-SNAPSHOT.jar and tetsapp-0.0.1-SNAPSHOT-source.jar is created)

The tables can be viewed through mysql command line.

Comments and Questions are wel come

Spring-Hibernate Maven project- Part 2

2010-01-22T17:23:00.007+05:30

Hibernate Mapping

Here the two domain classes have one-to-many relationship. One Person can have many Addresses while one Adress can have only one person. So there is a one-to-many relationship between Person and Address.

In hibernate we have to create the mapping file for each domain class. The mapping file represents the database table which is mapped with the domain class. The table will be created according to things indicated inside mapping classes.

Mapping file for Person.java: - Person.hbm.xml
Mapping file for Address.java: - Address.hbm.xml

Mapping files are located inside src/main/resources. If you have configured Hibernate to be used inside Eclipse you can simply use it. Otherwise let's configure eclpse for hibrenate.

Hibernate-Eclipse Configuration

Download Hibernate tools from here.
Extract the HibernateTools-3.X.zip file and put all the files inside the features folder into the features folder of the eclipse installation directory and put all the files inside the plugins folder into the plugins folder of the ecilpse installation directory. Restart the eclipse.

Right click src/main/resource.
Create New --Package
Create a new package called hibernate.
Then right click on hibernate package and click New--Other
In the New wizard Select Hibernate Icon and expand it.
Select Hibernate XML Mapping file (hbm.xml)

Click Next.

Type Person.hbm.xml as the file name.

Click Next.

In the Hibernate XML mapping file window, click Browse. A window will be opened named Select a class to map.

In the text field type Person.java. And select the correct class from the comming list of classes.

Click Ok and Click Finish

Similarly create the Addrees.hbm.xml file mapped with Address.java class.

Now the project structure will be as follows.

Let's put the content to mapping files.
Person.hbm.xml

Let's see the each an ever tag.
class tag: defines which is the class being used and table being mapped for the class.
id tag: An attribute inside class which is going to be primary key of the table (PersonID)
name: attribute name of the class

type: type of the table column, to match with the class attribute type (Long=long)

column: column name of the resulting table
property tag All the attributes in the class expect lists and id attribute
name: attribute name of the class

type: type of the table column, to match with the class attribute type (String=string)

column: column name of the resulting table
list tag: The lists inside class
name: Name of the List inside the class

key tag:Defines the column name of this table which goes as the foriegn key to the Address class

one-to-many tag: This describes the one-to-many relationship which creats the List inside class. (One Project has many Addresses)

class : One-to-many relationship defining class (Address for Person)

Address.hbm.xml

Respond to the Project class set tag with one-to-many tag, here we have to define the many-to-one tag
name: name of the attribute of class which reffers the Person class

class: Class with whome this class makes the relationship

This will be added to the ADDRESS table as column name which defined in Person mapping file.(key column="PERSON_ID")

Next

Spring-Hibernate Maven project- Part 1

2010-01-22T14:06:00.004+05:30

Here the maven project created in last post, will be extended to add new Persons in to system who has multiple Addresses.

Add the Spring Hibernate dependencies into pom.xml file inside project tags, after the version tag.


 4.0.0
 org.test.testapp
 testapp
 0.0.1-SNAPSHOT
 
  
   org.hibernate
   hibernate-core
   3.3.1.GA
  
  
   org.springframework
   spring
   ${springVersion}

Dependencies are added, so that once the project install goal is being executed the, needed libraries are added to the project. So we can access the spring and hibernate API's inside our project.

Now right click the project. Select Run As and then Select maven install. Or go to project location through command line and execute mvn install command. If no errors were found, and you got BUILD SUCCESSFULL, then you have added the dependencies successfully.

Let's add domain classes to the project. The domain is consist of Person and Address classes.
In maven project directory structure, all the source files will be located in src/main/java directory.

Right click on the src/main/java directory and clike New--Class

Give Person as the class name and org.test.testapp.domain as the package name.

Now create the Address class inside the same package.

Put the following code inside Address.java.

package org.test.testapp.domain;

public class Address {
    private Long AddressID;
    private String Street;
    private String City;
    private String AreaCode;
    private Person NewPerson;

    public Long getAddressID() {
        return AddressID;
    }

    public void setAddressID(Long addressID) {
        AddressID = addressID;
    }
    public Person getNewPerson() {
        return NewPerson;
    }

    public void setNewPerson(Person newPerson) {
        NewPerson = newPerson;
    }

    public String getStreet() {
        return Street;
    }

    public void setStreet(String street) {
        Street = street;
    }

    public String getCity() {
        return City;
    }

    public void setCity(String city) {
        City = city;
    }

    public String getAreaCode() {
        return AreaCode;
    }

    public void setAreaCode(String areaCode) {
        AreaCode = areaCode;
    }

}

Now put the following code inside Person.java

package org.test.testapp.domain;

import java.util.List;

public class Person {
    private Long PersonID;
    private String Name;
    private String TelNo;
    private List AddressList;

    public Long getPersonID() {
        return PersonID;
    }
    public void setPersonID(Long personID) {
        PersonID = personID;
    }

    public String getName() {
        return Name;
    }
    public void setName(String name) {
        Name = name;
    }
    public String getTelNo() {
        return TelNo;
    }
    public void setTelNo(String telNo) {
        TelNo = telNo;
    }
    public List getAddressList() {

        return AddressList;
    }
    public void setAddressList(ListaddressList) {
        AddressList = addressList;
    }

}

Note: Here the both classes consist of their attributes and the getter setter methods for each attribute. For implemet the hibernate connction to thses classes you must follow this coding standard where attributes kept private and getter setter methods fr each attribute kept public.

Here is the new structural view of the project after adding 2 domain classes.

In the next part let's see how to implement the hibernate mapping classes for these domain classes.

Create a Simple Maven Project

2010-01-22T09:59:00.010+05:30

Open Eclipse.

Create a new maven project. File--New--Other

New Wizard will open. There go to maven icon and expand it. Then Select Maven Project item.

Click Next.

In the New Maven Project wizard, select the create a simple project (skip archetype selection) check box.

Click Next

In the New Maven Project wizard enter the following values.

Group Id: org.test.testapp

Artifact Id: testapp

Version: 0.0.1-SNAPSHOT

Packaging: jar

Click Finish.

New Maven Project will be created and display in the Project Explore.

Here is the initial project structure of the created simple Maven project with a jar packaging.

Pom.xml file will contain the following initial details



	4.0.0

	org.test.testapp

	testapp

	0.0.1-SNAPSHOT

Run the Project

Executing Maven Goals.

Right Click on the testapp.

Select Run as

Here you can see the configured goals.

Maven install, Maven clean etc

maven install goal will install all the necessary dependancies inside pom.xml and create the packaging file which is jar or war file.

In this project we haven't done anything.

In the next post I will show you haow to create a simple spring-hibernate project.

After we creating the project inside eclipse we can run the application even through command line, if you have installed Apache Maven in to you PC.

For that you have to open commandline and go to the project directory thorugh command line and execute the mvn commands such as mvn clean, mvn install, etc.

ex: %testapp> mvn install

Installing Apache Maven and Configuring Eclipse with Maven

2010-01-21T17:27:00.004+05:30

Installing Maven into your PC

Download Maven from ~~here~~.MavenDownload

Unzip the file and put into Program files. So the Maven path would be C:\Program Files\apache-maven-2.2.1

Setting the Maven Environment Varable

Right click My Computer

Go to advanced tab

Click “Environment Variables” button

In the System variables click new button. Set the path to Maven directory and give M2_HOME as variable name as follows.

Click ok.

Now from the System Variable set select “Path” variable and click edit.

Add the ;% M2_HOME%/bin; at the end of path value as follows.

Click ok.

Verify the Installation

Open command line and type mvn command.

Eclipse-Maven Configuration

Note that for Eclipse Update for Maven does not require Apache Maven to be installed to your PC.

First download eclipse 3.4.0 from ~~here~~ Latest Eclipse Download

Then after the Eclipse installation update the Eclipse for m2Eclipse plug-in. Then you can work with maven inside Eclipse IDE.

Run Eclipse
Go to Help
Software Updates

Click Add Sites and in the opening window give the following URL.

~~http://m2eclipse.sonatype.org/update/~~

http://download.eclipse.org/technology/m2e/releases

Click Ok

Then Select Maven Integration for Eclipse Update Site from the site list and click install

After the successful update the eclipse will be asked for restart. Restart it. Now you can ensure the maven update by opening maven console.

Go to Window icon from the menu bar
Select Show view
Select Console

Eclipse console will be opened. In the console click “Open Console menu”. There you can see maven console selection. Select it. Console will change to maven console.

Thread Synchronization

2010-01-06T14:35:00.004+05:30

When multiple threads are accessing a common method through their run methods, the output of that particular program is unpredictable, because while one thread is gone half way through the common method, another thread would gain the common method.

Similarly the common method execution result of multiple threads can have a variety and also may attack to the accuracy of the expected result.

If you need to let the common method accessible by one thread at one time you have to done it through synchronization.

Imagine you expect to increase the value of number in Thread A, and the value of number Thread B by one via calling the common method count().

Examine the following code and see the result by executing it.

class SynchDemo{
    int common=7;
    public static void main(String args[]){

        SynchDemo demo=new SynchDemo();

        A a =new A();
        a.active(demo);
        a.start();

        B b=new B();
        b.active(demo);
        b.start();

    }

    public int count(int x){
        common=x;
        try{
            Thread.sleep(1000);
        }catch(Exception ee){
        }
        return ++common;
    }
}

class A extends Thread{
    int number=5;
    SynchDemo demo;

    public void run(){
        System.out.println("Start Thread A\n");
        System.out.println("A before increase:"+number+"\n");
        System.out.println("A after increase by one:"+demo.count(number)+"\n");
    }

    public void active(SynchDemo demo){
        this.demo=demo;

    }

}

class B extends Thread{
    int number=10;
    SynchDemo demo;

    public void run(){
        System.out.println("Start Thread B\n");
        System.out.println("B before increase:"+number+"\n");
        System.out.println("B after increase by one:"+demo.count(number)+"\n");
    }

    public void active(SynchDemo demo){
        this.demo=demo;

    }

}

The result can be,

The result of the program is wired, try multiple times.

Increased value of Thread A or Thread B becomes incorrect most of the time.

That's because another thread enters to the method and the value will be updated by that thread. So the previous thread gets the updated value to increase.Let's use Synchronization....

In Synchronization we can make a code mutually exclusive to multiple threads through a common object. When we add the key word 'synchronized' before the common method, the Thread which calls the method will put a lock to the object it uses to call the method.

Examine the following code and see the result.



class SynchDemo{
   
    int common=7;
   
    public static void main(String args[]){
       
        SynchDemo demo=new SynchDemo();
       
        A a =new A();
        a.active(demo);
        a.start();

        B b=new B();
        b.active(demo);
        b.start();

    }

    public synchronized int count(int x){
        common=x;
        try{
            Thread.sleep(1000);
        }catch(Exception ee){
        }
        return ++common;
    }
 }

class A extends Thread{
    int number=5;
    SynchDemo demo;

    public void run(){
        System.out.println("Start Thread A\n");
        System.out.println("A before increase:"+number+"\n");
        System.out.println("A after increase by one:"+demo.count(number)+"\n");
    }

    public void active(SynchDemo demo){
        this.demo=demo;

    }

}

class B extends Thread{
    int number=10;
    SynchDemo demo;

    public void run(){
        System.out.println("Start Thread B\n");
        System.out.println("B before increase:"+number+"\n");
        System.out.println("B after increase by one:"+demo.count(number)+"\n");
    }

    public void active(SynchDemo demo){
        this.demo=demo;

    }

}

The result is guranteed to increase the valuse of threads by one.

Here the common method is count(). The object used to call the method is ‘demo’. So the first thread which calls the method count(), gain the lock of the object 'demo'.

As next thread also need 'demo' object to call method count() it has to wait until First thread come out of the synchronized method and release the lock. Soon The next thread can gain the lock in 'demo' and execute count().

The most important thing is,
Both methods have used the same object to call the common method. Otherwise synchronizing the method won't help. Try using different objects.

Article Prepared by : Lakmali Erandi

Thread join() method

2010-01-05T14:20:00.004+05:30

method-void join()

class-java.lang.Thread

non-static

throws Interrupted Exception

The method join can be used to make one thread joined into the end of another thread.This is a guranteed method.

Examine the following code and see the result.

class Demo{
    public static void main(String args[]){

        A a=new A();
        B b=new B();

        a.start();
        b.start();

        }
}

class A extends Thread{
    public void run(){

        System.out.println("Thread A started");
        System.out.println("Thread A running");
        System.out.println("Thread A ending");
    }
}


class B extends Thread{
    public void run() {

        System.out.println("Thread B started");
        System.out.println("Thread B running");
        System.out.println("Thread B ending");

    }
}

Result can not be guessed, as two threads execute separately.

Imagine you want to execute Thread-B after the complete execution of Thread-A. (First Thread A, then Thread B)I am goin to show two comman ways to do that.

Method (1)

You can call join method of Thread-A from the Thread-B.
But make sure a thread A need to started, before calling join method.
Then start the Thread B.

class Demo{
    public static void main(String args[]){


        B b=new B();

        b.starting();

        }
}

class A extends Thread{
    public void run(){

        System.out.println("Thread A started");
        System.out.println("Thread A running");
        System.out.println("Thread A ending");
    }

    public void starting(){
            this.start();

        }

}


class B extends Thread{
    public void run() {

        System.out.println("Thread B started");
        System.out.println("Thread B running");
        System.out.println("Thread B ending");

    }

    public void starting(){
            A a=new A();
            a.starting();
            try{
                a.join();
            }catch(InterruptedException e){

                }

            this.start();


        }
}

Result can be gurantedd to be as follows.

Method (2) Join thread-A to another third thread , which executes both A, B threads. Here, Demo class starts A and B threads. Which means main thrad of Demo class. So first start the Thread A. Then join main thread or the current into thread thread A. Start Thread B.

class Demo{
    public static void main(String args[]){

        A a=new A();
        a.start();

        try{
            a.join();// Joins the main thread of class Demo which is the current thread into Thread A.
                       //The rest of the code below this point will continue after terminating the Thread A.
        }catch(InterruptedException e){

            }

        System.out.println(a.isAlive());//Thread A is terminated and returns false here

        B b=new B();

        b.start();

        }
}

class A extends Thread{
    public void run(){

        System.out.println("Thread A started");
        System.out.println("Thread A running");
        System.out.println("Thread A ending");
    }


}


class B extends Thread{
    public void run() {

        System.out.println("Thread B started");
        System.out.println("Thread B running");
        System.out.println("Thread B ending");

    }


}

Result can be gurantedd to be as follows,.

One important thing to know is that when we call,

a.join();

The current executing thread is joined onto the end of the the thread represented by 'a'.So the rest of the code beyond this point will execute only after 'a' is teminated (Finished executing its run method).

Dialog internet wasted my holiday!

2009-12-25T20:46:00.000+05:30

I'm Using Dialog Huwaei E220 modem for internet access. Today(25/12/2009) @ 10.30A.M( around) my connection was interrupted. Then I tried to reestablish it( connect again). But always I got the following error message as Error 620

I tried more than 30 times, but every time I got the same error. But I was able to send SMS through the modem. :)

Then I connected to internet using my mobile. After that I did contact Dialog Internet Customer Care Service (CHAT). Time was around 6.20 PM.I told them about this issue. They confirmed as my connection is OK. Further they asked about APN and other things on my dialog connection. I replied them as my APN is www.dialogsl.com and access number is *99***1#. Again they confirmed that my connection need to be worked fine. I was hopeless.

After that I again tried to dial my Huwaei E220, but still I got the same error message. Then I called Dialog Internet Care Service-Technical(Call)- 0777676576.

(Now the time is aroung 6.55PM) After waiting about 10 minutes one technical officer called and I told him about my connection issue. He asked what is the APN which I am currently using, I replied www.dialogsl.com. After that he instructed me to change the APN to dialogbb and reconnect . It did work!

My Question is,

Why are these people does not inform their customers by sending SMS, before or after doing this kind of changes?

Better to change your new access point in to dialogbb

Cron Job (Job scheduler) for Web Application

2009-07-19T19:04:00.003+05:30

This Cron job(Timer Task, Job scheduler) Start when web application deploying and run according to give time schedule. For adjust the time want to edit time rage of class.

1. Add following 2 java class in to web application and adjust time with request time period.
2. Add Listener class property in to web.xml

Web XML entry

Listener class

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.itfac.chandana;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
*
* @author Chandana
*/
public class WisdomListener implements ServletContextListener {

private ServletContext context = null;

public void contextDestroyed(ServletContextEvent event) {

System.out.println("Application is undeploying");
this.context = null;

}

public void contextInitialized(ServletContextEvent event) {
this.context = event.getServletContext();
TimerTaskScheduler taskShe = new TimerTaskScheduler();
taskShe.test();
System.out.println("Application is deploying");

}
}

TimerTaskScheduler

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

package com.itfac.chandana;

import java.util.Calendar;
import java.util.Timer;

/**
*
* @author Chandana
*/
public class TimerTaskScheduler {

public void test() {
Timer timer = new Timer();
Calendar date = Calendar.getInstance();
date.set(Calendar.HOUR, 0);
date.set(Calendar.MINUTE, 0);
date.set(Calendar.SECOND, 2);
date.set(Calendar.MILLISECOND, 0);
// Schedule to run every Sunday in midnight
timer.schedule(new JobRunner(), date.getTime(), 1000*60*60*24);
}

}

JobRunner

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.itfac.chandana;

import java.util.Calendar;
import java.util.Date;
import java.text.*;
import java.sql.*;
import java.util.Timer;
import java.util.TimerTask;
/**
*
* @author Chandana
*/
class JobRunner extends TimerTask {

public JobRunner() {
}

@Override
public void run() {
System.out.println("Generating ");
/**
*Your Cron jobs code want to pply here.

}

}

Multiple versions of IE on one machine

2009-06-19T20:21:00.003+05:30

WAY 1
I mentioned that you can indeed install multiple versions of IE on one machine. Microsoft has recently made Virtual PC 2004 a free download; we’ve taken advantage of that by releasing a VPC virtual machine image containing a Windows XP SP2, IE6 or IE7 or IE 8 this will help facilitate your testing and development.

Get more information on Virtual PC 2004
Download Virtual PC 2004
Download the Internet Explorer ALL Testing VPC Image

WAY 2

Tredosoft provides an installer that does everything you need to get that for IE3 IE4.01 IE5 IE5.5 and IE6. They also provide a standalone installer for IE 7.

Link

First way I tested and It was very helpful for my web development works.

My Library

2008-12-16T09:11:00.006+05:30

Unlock Dialog Huawei E220 HSDPA Modem

2008-12-07T06:43:00.008+05:30

New Post: How to Unlock Any Huawei Modem

There is simple method to unlock dialog HSDPA modem. then you can use it on Mobitel network also. Because it is very easy to access Internet through Pre-Paid connection.

More Info about Mobitel 3G Daily Delight

Install following firmware and update your Mobile partner software . Then your Mobile Partner software change as Mobile Connect.
Firmware Download

After that create New Connection
Settings --> Network connection Settings --> New

Number : *99***1#
APN and Additional Settings --> APN : www.dialogsl.com
**************************************************************************

Unlock Document : PDF
Software : Huawei Patch , Hex Editor , QC Mobile Analysis Tool , E220 Unlocker

help my site stand out :

Huawei E220 modem on Ubuntu with Dialog HSDPA

2008-10-10T18:11:00.003+05:30

Type following command in terminal

         $ sudo wvdialconf /etc/wvdial.conf

         $ sudo gedit /etc/wvdial.conf

uncomment the ‘Phone‘ field and give the phone number as *99***1# and save the file.

*Esc ---> shift qw and Enter for save in vim edit ($ sudo vim /etc/wvdial.conf )

install the following files and add the huawei driver. Drivers

$ tar xjvf huawei.tar.bz2
$ cd huawei
$ su
$ make info
continue installation acoding to info file..

Install conection software using following .deb file Software

If you want to monitor network usage following package... Package

more info: Visit

Java Location API

2008-10-08T12:15:00.003+05:30

Here is Example Java Location API example. But work for this want to support Java Location API in UR mobile and inbuilt GPS receiver(I only test with mobile emulator).

what is Location API:

The Java Location API for J2ME is intended to run on small client devices such as mobile phones.The Location API object model consists of 11 classes and two listener interfaces (LocationListener and ProximityListener), all in the javax.microedition.location package. Their design approach uses several standard patterns—Facade, Factory Method, Singleton, and Value Object, and standard JavaBeans-style accessors. Of the 11 classes, two are Exception classes (LocationException and LandmarkException) and another four (AddressInfo, Criteria, Orientation, and QualifiedCoordinates) are primarily value objects. Many of the properties of these objects may in practice be unavailable, depending on the location-finding technology implementing the API. Still, these properties anticipate likely future developments in mobile networks and devices and the level of location and context detail that they provide.

Example Code:

package com.test.location;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.location.*;

public class LocTest extends MIDlet implements CommandListener {

private Display display;
private Form form;
private Command cmdExit,  cmdOK;
private StringItem si;

public LocTest() {
display = Display.getDisplay(this);
form = new Form("Location Api test");
cmdExit = new Command("Exit", Command.EXIT, 5);
cmdOK = new Command("OK", Command.OK, 1);
si = new StringItem("Geo Location", "Click OK");
form.append(si);
form.addCommand(cmdOK);
form.addCommand(cmdExit);
form.setCommandListener(this);
}

public void startApp() {
display.setCurrent(form);
}

public void pauseApp() {
}

public void destroyApp(boolean flag) {
notifyDestroyed();
}

public void commandAction(Command c, Displayable d) {
if (c == cmdOK) {
Retriever ret = new Retriever(this);
ret.start();
} else if (c == cmdExit) {
destroyApp(false);
}
}

public void displayString(String string) {
si.setText(string);
}
}

public class Retriever extends Thread {

private LocTest midlet;

public Retriever(LocTest midlet) {
this.midlet = midlet;
}

public void run() {
try {
checkLocation();
} catch (Exception ex) {
ex.printStackTrace();
midlet.displayString(ex.toString());
}
}

public void checkLocation() throws Exception {
String string;
Location l;
LocationProvider lp;
Coordinates c;

Criteria cr = new Criteria();
cr.setHorizontalAccuracy(500);

lp = LocationProvider.getInstance(cr);
l = lp.getLocation(60);

c = l.getQualifiedCoordinates();
if (c != null) {
// Use coordinate information
double lat = c.getLatitude();
double lon = c.getLongitude();
string = "\nLatitude : " + lat + "\nLongitude : " + lon+ "\nSpeed(km/h): " + (l.getSpeed() *3.59999);
} else {
string = "Location API failed";
}
midlet.displayString(string);
}
}

Java interview ask question

2008-10-01T22:26:00.001+05:30

Question: Why Java does not support multiple inheritence ?
Answer: Java DOES support multiple inheritance via interface implementation.

Question:What is the difference between final, finally and finalize?
Answer: o final - declare constant
o finally - handles exception
o finalize - helps in garbage collection

Question: Where and how can you use a private constructor.
Answer: Private constructor can be used if you do not want any other class to instanstiate the object , the instantiation is done from a static public method, this method is used when dealing with the factory method pattern when the designer wants only one controller (fatory method ) to create the object.

Question: In System.out.println(),what is System,out and println,pls explain?
Answer: System is a predefined final class,out is a PrintStream object and println is a built-in overloaded method in the out object.

Question: What is meant by "Abstract Interface"?
Answer: First, an interface is abstract. That means you cannot have any implementation in an interface. All the methods declared in an interface are abstract methods or signatures of the methods.

Question: Can you make an instance of an abstract class? For example - java.util.Calender is an abstract class with a method getInstance() which returns an instance of the Calender class.
Answer: No! You cannot make an instance of an abstract class. An abstract class has to be sub-classed. If you have an abstract class and you want to use a method which has been implemented, you may need to subclass that abstract class, instantiate your subclass and then call that method.

Question: Why Java does not support pointers?
Answer: Because pointers are unsafe. Java uses reference types to hide pointers and programmers feel easier to deal with reference types without pointers. This is why Java and C# shine.

Question: Does it matter in what order catch statements for FileNotFoundException and IOExceptipon are written?

Answer: Yes, it does. The FileNoFoundException is inherited from the IOException. Exception's subclasses have to be caught first.

Question: Can an inner class declared inside of a method access local variables of this method?

Answer: It's possible if these variables are final.

Question: What's the main difference between a Vector and an ArrayList

Answer: Java Vector class is internally synchronized and ArrayList is not.

Question: When should the method invokeLater()be used?

Answer: This method is used to ensure that Swing components are updated through the event-dispatching thread.

Question: How can a subclass call a method or a constructor defined in a superclass?

Answer: Use the following syntax: super.myMethod(); To call a constructor of the superclass, just write super(); in the first line of the subclass's constructor.

For senior-level developers:

Question: What's the difference between a queue and a stack?

Answer: Stacks works by last-in-first-out rule (LIFO), while queues use the FIFO rule

Question: You can create an abstract class that contains only abstract methods. On the other hand, you can create an interface that declares the same methods. So can you use abstract classes instead of interfaces?

Answer: Sometimes. But your class may be a descendent of another class and in this case the interface is your only option.

Question: What comes to mind when you hear about a young generation in Java?

Answer: Garbage collection.

Question: What comes to mind when someone mentions a shallow copy in Java?

Answer: Object cloning.

Question: If you're overriding the method equals() of an object, which other method you might also consider?

Answer: hashCode()

Question: You are planning to do an indexed search in a list of objects. Which of the two Java collections should you use: ArrayList or LinkedList?

Answer: ArrayList

Question: How would you make a copy of an entire Java object with its state?

Answer: Have this class implement Cloneable interface and call its method clone().

Question: How can you minimize the need of garbage collection and make the memory use more effective?

Answer: Use object pooling and weak object references.

Question: There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java technique would you use to implement it?

Answer: If these classes are threads I'd consider notify() or notifyAll(). For regular classes you can use the Observer interface.

Question: What access level do you need to specify in the class declaration to ensure that only classes from the same directory can access it?
Answer: You do not need to specify any access level, and Java will use a default package access level .

Netbeans Support Multi Language

2008-06-08T14:31:00.000+05:30

Netbeans, the free, open source, software development environment from Sun Microsystems, has just reached version 6.1 (see the Netbeans 6.1 release notes for detailed info).New for version 6.1 is all-new, completely redesigned support for JavaScript (whether it’s standalone JavaScript, or embedded in other files e.g. HTML).

Java user groups and developers have contributed work to make NetBeansTM 6 IDE available in Japanese, Chinese, Brazilian Portuguese, English and Chinese. The NetBeans Translation Project provides opportunities for members of the community to localize the IDE and documentation.

We expect nearly netBeans support Sinhalese and Tamil language also.

Press Release

Netbeans challenges Other IDE's

2008-05-16T09:57:00.003+05:30

Netbeans has a simple but powerful GUI designer. Create your application window, drag buttons onto it and then double click them to add code and events. If you’ve used the GUI builder in VBA applications, it looks and works a lot like that. And it is extremely easy to learn while at the same time providing powerful layout helpers.

Creating a State Diagram

2008-04-20T11:09:00.000+05:30

A State diagram is a visual representation of an application's state machines. It shows the life of an object from birth to death. In this type of diagram, you see the behavior specifying the sequence of states that the object goes through in response to events over its lifetime, and you see the object's responses to those events.

You can use a State diagram when you are working on a real-time process-control application or a subsystem that involves concurrent processing, or when you want to express the behavior of a class over several use cases.

1. Create a UML Project and add a State diagram

1. Choose File New Project.

2. In the New Project wizard:
1. Select Categories UML.
2. Select Projects Platform-Independent Model.
3. Click Next.

3. In the New Platform-Independent Model panel:
1. Type a name for the UML project, such as MyUMLProject.
2. Choose a directory where the project will be stored.

4. Click Finish.

5. In the opened New Wizard window:
1. Select State Diagram for the Diagram Type.
2. Type in a name for the diagram, such as SodaMachineStateDiagram.
3. Accept the default value for namespace.
4. Click OK.

The IDE does the following:

* Creates a platform-independent project especially designed to handle UML modeling work.
* Displays the project icon in the Project window.
* Generates a State diagram in the project.
* Displays the State diagram icons under both Project Model and Project Diagrams.
* Opens and displays the State diagram in the diagram editor.
* Opens the modeling palette to display the particular icons that are used to build State diagrams.

Next, we will draw a State diagram for a simple soda-machine application.
2. Identify State elements and add them to the State diagramHEADER

1. Add an Initial State: Click the Initial State icon in the palette, then click the upper left corner in the State diagram.
2. Add a Simple State: Click the Simple State icon in the palette, then click the State diagram to the right of the Initial State.
3. Right-click to deselect element-creation mode.
4. Double-click the Simple State and name it: Type Displaying, then press the Enter key.
5. Add three more Simple States and name them Refunding, Calculating, and Processing.
6. Add a Final State: Click the Final State icon in the palette, then click at the bottom of the State diagram.
7. Right-click to deselect element-creation mode.
8. Right-click and select Labels Final State Name to toggle the name label off. (In this particular example, the Final State does not need a name.)

3. Identify events, and connect states with State Transition

An event causes an object to transition from one state to another. In a State diagram, an event is represented by an arrow connecting the two states; this is called a State Transition element. As we continue our example, we will create a State Transition between the Initial State and the State we have called Displaying. Then, we will add several other State Transitions.

1. Add a State Transition element:
1. Click the State Transition icon in the palette.
2. Go to the State diagram and click the Initial State.
3. Click the Displaying State.

2. Add a State Transition element from the Displaying State to itself:
1. Click the State Transition icon in the palette.
2. Go to the diagram and click the Displaying State.
3. Move the mouser pointer up a bit, click the diagram, then move the pointer to the right a bit and click the Displaying State in the diagram.

3. Place a Horizontal Join/Merge element just below the Displaying State:
1. Click the Horizontal Join/Merge icon in the palette.
2. Click the State diagram below the Displaying State element.

4. Add eight more State Transition elements:
* From the Displaying State to the Horizontal Join/Merge
* From the Horizontal Join/Merge to the Refunding State
* From the Horizontal Join/Merge to the Calculating State
* From the Calculating State to the Processing State
* From the Calculating State to the Displaying State
* From the Processing State to the Refunding State
* From the Refunding State to the Final State
* From the Processing State to the Final State

4. Label State Transition with a name, and with a pre-condition or post-condition

Now we'll give the State Transition an event name and, where necessary, add a pre- or post-condition.

1. Right-click the State Transition (the linking arrow) between the Initial State and the Displaying State.
2. Choose Label Name, and type Coins Entered.
3. In the same way, label other State Transitions:

Label Name State Transition
Coins Entered Displaying State to Displaying State
Button Pressed Displaying State to Horizontal Join/Merge
Calculating Finished Calculating State to Displaying State
Calculating Finished Calculating State to Processing State
Soda Ejected Processing State to Final State
Soda Ejected Processing State to Refunding State
Coins Refunded Refunding State to Final State

Some State Transitions are subject to conditions, and these need to be labeled. A condition is shown in square brackets on the State Transition link.

1. Right-click the State Transition link between Horizontal Join/Merge and Refunding.
2. Choose Label Pre Condition, and type button=refund.
3. Repeat these steps to label pre-conditions on other State Transitions.

Pre-Condition State Transition
button!=refund Horizontal Join/Merger to Calculating State
cost<=coin value Calculating State to Processing State
cost>coin value Calculating State to Displaying State
cost cost=coin value Processing State to Final State

NetBeans IDE Keyboard Shortcuts

2008-04-13T11:03:00.000+05:30

Ctrl-Space	Code completion
Esc	Close code completion
Shift-Space	Enter a space without expanding an abbreviation
Alt-F1	Display Javadoc
Shift-F1	Search Javadoc
Alt-Shift-I	Import class
Alt-U, G	Append get to identifier
Alt-U, S	Append set to identifier
Alt-U, I	Append is to identifier
Ctrl-Shift-F	Reformat selection
Ctrl-T Shift	one tab to the right
Ctrl-D	Shift one tab to the left
Ctrl-Shift-T	Comment out with line comments ("//")
Ctrl-Shift-D	Remove line comments ("//")
Ctrl-W	Delete current or previous word
Ctrl-E	Remove the current line
Ctrl-J, S	Start recording macro
Ctrl-J, E	Stop macro recording
Ctrl-[	Move insertion point to matching bracket
Ctrl-L	Word match - forward
Ctrl-K	Word match - back
Ctrl-F	Find
Ctrl-H	Replace
F3	Find next
Shift-F3	Find previous
Ctrl-F3	Search for word that insertion point is on
Alt-Shift-H	Turn off search result highlighting
Alt-Shift-O	Fast Open class
Alt-O	Go to source
Alt-G	Go to declaration
Ctrl-M	Select next parameter
Ctrl-F2	Add/remove bookmark
F2	Next bookmark
Alt-L	Next in jump list (present file)
Alt-K	Previous in jump list (present file)
Alt-Shift-L	Next in jump list (all files)
Alt-Shift-K	Previous in jump list (all files)
Ctrl-Shift-J	Insert internationalized string
Ctrl-Minus (-)	Collapse (hide) a block of code
Ctrl-Plus (+)	Expand a collapsed block of code
Ctrl-Shift-Minus (-)	Collapse all code blocks
Ctrl-Shift-Plus (-)	Expand all code blocks

Java 1.5 Language Features

2008-04-01T13:04:00.000+05:30

Generics

This long-awaited enhancement to the type system allows a type or method to operate on objects of various types while providing compile-time type safety. It adds compile-time type safety to the Collections Framework and eliminates the drudgery of casting.

Enhanced for Loop

This new language construct eliminates the drudgery and error-proneness of iterators and index variables when iterating over collections and arrays.

Autoboxing/Unboxing

This facility eliminates the drudgery of manual conversion between primitive types (such as int) and wrapper types (such as Integer).

Typesafe Enums

This flexible object-oriented enumerated type facility allows you to create enumerated types with arbitrary methods and fields. It provides all the benefits of the Typesafe Enum pattern ("Effective Java," Item 21) without the verbosity and the error-proneness.

Varargs

This facility eliminates the need for manually boxing up argument lists into an array when invoking methods that accept variable-length argument lists.

Static Import

This facility lets you avoid qualifying static members with class names without the shortcomings of the "Constant Interface antipattern."

Metadata (Annotations)

This language feature lets you avoid writing boilerplate code under many circumstances by enabling tools to generate it from annotations in the source code. This leads to a "declarative" programming style where the programmer says what should be done and tools emit the code to do it. Also it eliminates the need for maintaining "side files" that must be kept up to date with changes in source files. Instead the information can be maintained in the source file.

Fantastic Features In Net Bean IDE

2008-03-20T12:05:00.000+05:30

I downloaded latest Net Bean IDE for my new project in University. There i can create GUI very easily. Yesterday I connect my project folder in to SVN server. Using this latest Net Bean IDE I can very easily connect to SVN server.

Java Bean

2008-03-10T12:25:00.009+05:30

JavaBeans are classes written in the Java programming language conforming to a particular convention. They are used to encapsulate many objects into a single object (the bean), so that the bean can be passed around rather than the individual objects.The specification by Sun Microsystems defines them as "reusable software components that can be manipulated visually in a builder tool".

Example:

// PersonBean.java
       public class PersonBean implements 
           java.io.Serializable {
        private String name;
        private boolean deceased;
        // No-arg constructor (takes no arguments).
        public PersonBean() {

        }

       // Property "name" (note capitalization) 
             readadble/writable
       public String getName() {
          return this.name;
       }

       public void setName(String name) {
           this.name = name;

       }

       // Property "deceased"
       // Different syntax for a boolean field 
          (is vs. get)

       public boolean isDeceased() {
           return this.deceased;
       }

       public void setDeceased(boolean deceased) {
         this.deceased = deceased;
       }


     }

// TestPersonBean.java

    public class TestPersonBean {
    public static void main(String[] args) {

    PersonBean person = new PersonBean();
    person.setName("Bob");
    person.setDeceased(false);

    // Output: "Bob [alive]"
    System.out.print(person.getName());
    System.out.println(person.isDeceased() 
        ? " [deceased]" : " [alive]");
    }
    }



link:

What Is Hibernate

2008-03-07T08:09:00.001+05:30

Hibernate is an object-relational mapping (ORM) library for the Java language, providing a framework for mapping an object-oriented domain model to a traditional relational database. Hibernate solves Object-Relational impedance mismatch problems by replacing direct persistence-related database accesses with high-level object handling functions.Hibernate is free as open source software that is distributed under the GNU Lesser General Public License.

Hibernate's primary feature is mapping from Java classes to database tables (and from Java data types to SQL data types). Hibernate also provides data query and retrieval facilities. Hibernate generates the SQL calls and relieves the developer from manual result set handling and object conversion, keeping the application portable to all SQL databases, with database portability delivered at very little performance overhead.

LINK: Interview with Gavin King, founder of Hibernate HIBERNATE

Video Transmit Using JMF

2008-03-06T07:57:00.001+05:30

Here is One example for video transmit using JMF:

import java.awt.*;
import javax.media.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import javax.media.format.*;
import javax.media.control.TrackControl;
import javax.media.control.QualityControl;
import java.io.*;

public class VideoTransmit {

private MediaLocator locator;
private static MediaLocator ml;
private String ipAddress;
private String port;
private Processor processor = null;
private DataSink rtptransmitter = null;
private DataSource dataOutput = null;
public static CaptureDeviceInfo di = null;

public VideoTransmit(MediaLocator locator,
String ipAddress,
String port) {

this.locator = locator;
this.ipAddress = ipAddress;
this.port = port;
}

public synchronized String start() {
String result;
result = createProcessor();
if (result != null)
return result;

result = createTransmitter();
if (result != null) {
processor.close();
processor = null;
return result;
}

processor.start();

return null;
}

public void stop() {
synchronized (this) {
if (processor != null) {
processor.stop();
processor.close();
processor = null;
rtptransmitter.close();
rtptransmitter = null;
}
}
}

private String createProcessor() {
if (locator == null)
return "Locator is null";

DataSource ds;
DataSource clone;

try {
ds = Manager.createDataSource(locator);
} catch (Exception e) {
return "Couldn't create DataSource";
}

try {
processor = Manager.createProcessor(ds);
} catch (NoProcessorException npe) {
return "Couldn't create processor";
} catch (IOException ioe) {
return "IOException creating processor";
}

boolean result = waitForState(processor, Processor.Configured);
if (result == false)
return "Couldn't configure processor";

TrackControl [] tracks = processor.getTrackControls();

if (tracks == null || tracks.length < 1) return "Couldn't find tracks in processor"; boolean programmed = false;
for (int i = 0; i < tracks.length; i++) {
Format format = tracks[i].getFormat();
if ( tracks[i].isEnabled() && format instanceof VideoFormat && !programmed) { Dimension size = ((VideoFormat)format).getSize();
float frameRate = ((VideoFormat)format).getFrameRate();
int w = (size.width % 8 == 0 ? size.width : (int)(size.width / 8) * 8);
int h = (size.height % 8 == 0 ? size.height : (int)(size.height / 8) * 8);
VideoFormat jpegFormat = new VideoFormat(VideoFormat.JPEG_RTP, new Dimension(w, h), Format.NOT_SPECIFIED, Format.byteArray, frameRate);
tracks[i].setFormat(jpegFormat); System.err.println("Video transmitted as:"); System.err.println(" " + jpegFormat); programmed = true; } else tracks[i].setEnabled(false); } if (!programmed) return "Couldn't find video track";
ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP);
processor.setContentDescriptor(cd); result = waitForState(processor, Controller.Realized); if (result == false) return "Couldn't realize processor";
setJPEGQuality(processor, 0.5f); dataOutput = processor.getDataOutput(); return null; } private String createTransmitter() { // rtp://129.130.131.132:42050/video String rtpURL = "rtp://" + ipAddress + ":" + port + "/video"; MediaLocator outputLocator = new MediaLocator(rtpURL); try { rtptransmitter = Manager.createDataSink(dataOutput, outputLocator); rtptransmitter.open();
rtptransmitter.start(); dataOutput.start(); } catch (MediaException me) { return "Couldn't create RTP data sink"; } catch (IOException ioe) { return "Couldn't create RTP data sink"; } return null; } void setJPEGQuality(Player p, float val) { Control cs[] = p.getControls(); QualityControl qc = null; VideoFormat jpegFmt = new VideoFormat(VideoFormat.JPEG); for (int i = 0; i < owner =" ((Owned)cs[i]).getOwner();" j =" 0;" qc =" (QualityControl)cs[i];" statelock =" new" failed =" false;" failed =" true;" failed =" false;" state ="="" state ="=""> ");
System.exit(-1);
}*/
ml = args[0];
String url1 = args[1];
String port1 = args[2];
VideoTransmit vt = new VideoTransmit(ml, url1, port1);

String result = vt.start();
if (result != null) {
System.err.println("Error : " + result);
System.exit(0);
}

System.err.println("Start transmission for 60 seconds...");

try {
Thread.currentThread().sleep(60000);
} catch (InterruptedException ie) {
}

vt.stop();

System.err.println("...transmission ended.");

System.exit(0);
}
}

Instructin:

For run: java media_location IPaddress Port

JMF download: SUN

Hardware Requirements

* 166 MHz Pentium, 160 MHz PowerPC, or 166 MHz UltraSparc
* 32 MB RAM or greater
* Optional: An appropriate sound card for audio play back, if necessary. For example, a SoundBlaster-compatible card for Windows machines without built-in audio support, or an Ultimedia sound card for AIX machines without built-in audio support.

Installation Instructions

1. Download the version of JMF you want to install by selecting a download format and and clicking the continue button.

The downloaded file is an executable. For Windows, it's an InstallShield executable; for Solaris, it's a self-extracting shell script; otherwise it's a generic zip file.

2. If you are installing the JMF Performance Pack for Windows

* Run the executable by double-clicking on the
jmf-2_1_1e-windows-i586.exe

NOTE: The Windows installation program automatically detects whether or not Netscape Communicator 4.03 or later is installed and then installs JMF for its use! If you are using Netscape Communicator 4.04 or 4.05, then you must install the JDK 1.1 patch for Netscape Communicator before you can run any JMF applets. Netscape Communicator 4.06 or greater already supports JDK 1.1 without the patch.

If you are installing the JMF Performance Pack for Solaris SPARC

* Change directories to the install location.
* Run the command % /bin/sh ./jmf-2_1_1e-solaris-sparc.bin

If you are installing the JMF Performance Pack for Linux

* Change directories to the install location.
* Run the command % /bin/sh ./jmf-2_1_1e-linux-i586.bin

If you are installing a zip file

* Run the appropriate zip command for your system, e.g. winzip or unzip to extract JMF onto your system.

3. IMPORTANT: You must finish setting up JMF by following the setup instructions included in the JMF Implementation Documentation. You can download the documentation package separately or view it online. ----->

What Is NetBeans IDE

2008-03-03T11:59:00.000+05:30

History:

NetBeans began in 1997 as Xelfi, a student project under the guidance of the Faculty of Mathematics and Physics at Charles University in Prague. A company was later formed around the project and produced commercial versions of the NetBeans IDE until it was bought by Sun Microsystems in 1999. Sun open-sourced the NetBeans IDE in June of the following year.

NetBeans 6.0.1NetBeans 6 version support for developing IDE modules and rich client application. The New GIU Builder, Subversion Support, JBoss support, CVS support and many more features included.

Set JFreeChart data from database

2008-02-26T12:48:00.006+05:30

Create Database and finish the configuration.

Consider this Example: link

dataset.addValue(1.0, series1, category1);


There you set value for the chart.

   while(resultset.next()){
      String test = resultset.toString(1);
      dataset.addValue(test, "series1", category1);
   }

Using database get the result set and devide that result set using while loop like this:

     

   if there any problem regarding that, add ur comment here