Skip to main content

EJB 3 on JBoss

Deploying EJB application on JBoss is very simple. You need o put .jar file of your ejb application into deploy directory of JBoss server. JBoss detect automatically it and terns it in running mode. JBoss will display binding name of EJB application on console whatever it assigned and you need to connect deployed ejb application through client program.

Here is an example.
EJB Program
package stateful.ejb;
import javax.ejb.*;
@Remote
public interface Adder{
    void setX(int x);
    void setY(int y);
    void add();
    int getResult();
}





package stateful.ejb;
import javax.ejb.*;
@Stateful(mappedName="stateful_adder")
public class AdderClass implements Adder{
    int x;
    int y;
    int z;
    public void setX(int x){
        System.out.println("client sent "+x);
        this.x=x;
    }
    public void setY(int y){
        System.out.println("client sent "+y);
        this.y=y;
    }
    public void add(){
        z=x+y;
        System.out.println("values added");
    }
    public int getResult(){
        System.out.println("result sent to client "+z);
        return z;
    }
}






Client Program
import javax.naming.*;
import java.util.*;
import javax.rmi.PortableRemoteObject;
class AdderClient{
    public static void main(String ar[])throws Exception{
        Properties p=new Properties();
       p.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
        p.put(Context.PROVIDER_URL,"localhost:1099");
        InitialContext ctx=new InitialContext(p);
        Object obj1=ctx.lookup("AdderClass/remote-stateful.ejb.Adder");
        stateful.ejb.Adder obj=(stateful.ejb.Adder)obj1;
        int a=Integer.parseInt(System.console().readLine("Enter First  value : "));
        obj.setX(a);
        int b=Integer.parseInt(System.console().readLine("Enter second value : "));
        obj.setY(b);
        obj.add();
        int c=obj.getResult();
        System.out.println("Sum = "+c);
    }
}

OUTPUT


On server Console
16:11:53,078 INFO  [STDOUT] client sent 10
16:11:56,281 INFO  [STDOUT] client sent 20
16:11:56,296 INFO  [STDOUT] values added
16:11:56,296 INFO  [STDOUT] result sent to client 30

On client Console
Enter First  value : 10
Enter second value : 20
Sum = 30

Comments

Popular posts from this blog

Using HyperSQL (HSQLDB)

HSQLDB is a portable RDBMS implemented in pure java. It can be embedded with your application as well as can be used separately. It is very a small database that supports almost all features of the standard database system. It comes with small jar file that can be found in lib folder. The HSQLDB jar package is located in the /lib directory of the ZIP package and contains several components and programs. Core components of jar file are : HyperSQL RDBMS Engine (HSQLDB), HyperSQL JDBC Driver, Database Manager, and Sql Tool. Installing and Using Download: download latest release of HyperSQL database from http://hsqldb.org website and extract it. You will see following contents. Here "bin" directory contains some batch files those can be used to run a swing based GUI tool. You can use runManagerSwing.bat to connect to database, but database must be on before running it. Directory lib contains File hsqldb.jar . It is the database to be used by you. Running database First

How to handle values from dynamically generated elements in web page using struts2

Some time you will see the form containing the button " Add More " . This facility is provided for the user to get the values for unknown number of repeating for some information. for example when you are asking to get the projects details from user, you need to put the option to add the more project for the user since you don't known how many projects user have. In the HTML form, you repeat the particular section to get the multiple values for those elements. In Html page , you can put the option to add new row of elements or text fields by writing the java script or using JQuery API. Now, the question is that how to capture the values of dynamically generated text fields on the server. Using the servlet programming you can get the values by using getParameters() method that resultants the array of the parameter having the same name. But this limit you to naming the text fields in the HTML form. To ally this approach, you have to take the same name for t

Generating JTable from database table

package  process; import  javax.swing. * ; import  javax.swing.table. * ; import  java.sql. * ; /**  * This class create JTable from Database table.  * User program needs to specify database connection and corresponding atable name.  * @author Hemraj  */ public   class  TableToJTable {      //private String table;      private   Connection  con;      public   TableToJTable ( Connection  con ){          this .con = con;      }      /**      * This method return JTable object created from Database table having same data asn structure      * as in original table into database.      * @param table Name of the database table to be coverted to JTable      * @return JTable object that consist of data and structure of Database table      * @throws java.lang.Exception Original object is deferent, e.i either SQLException or NullPointerException      */      public   JTable   getTable ( String  table ) throws   Exception {          JTable  t1 = new   JTable () ;          D