//No change from Stateless

public interface Calc extends EJBObject
{
public int add(int a,int b) throws RemoteException;
public int sub(int a, int b) throws RemoteException;
}

2 Step: Home interface;

import javax.ejb.*;
import javax.rmi.*;

public interface CalcHome extends EJBHome
{
public Calc create() throws CreateException, RemoteException;

//Observe the change in the implementation of business methods
}

3 Step: Bean class file;

import javax.ejb.*;
import javax.rmi.*;

public class CalcBean implements SessionBean
{

//change here, creating some instance variables to be used in between method calls
SessionContext ctx;
int a,b;

public int add(int a ,int b)
{

//initialize local ot instance variables

this.a=a;
this.b=b;

return a+b;
}

//for subtraction, instance variables assigned in the previous call are used
public int sub()
{
return a-b;
}

//override all the 4 SessionBean methods

public void ejbCreate(){  }
public void ejbActivate(){  }
public void ejbPassivate(){  }
public void setSessionContext(SessionContext ctx)
{
this.ctx = ctx;
}
}

4 Step: Write XML files needed to create a manifest file

The template of XML files with default setting are available in :
C:\ weblogic\examples\ejb\basic\statefulsession\build\meta-Inf
Copy the Meta-Inf directory to your working directory. That is this Meta-Inf directory becomes subdirectory to your working directory.

1. ejb-jar.xml:

//on this name bean will be deployed
<ejb-name> Calculation </ejb-name>

//write your home interface name
<home> CalcHome </home>

//write your remote interface name
<remote> Calc </remote>

//write your bean class name
//earlier it is Stateless
<session -type> Stateful </session-type>

comedown and write again
<ejb-name> Calculation </ejb-name>

2. weblogic-ejb-jar.xml :

<ejb-name> Calculation </ejb-name>
comedown and write again

//this is reference name to be mentioned in client
//program and with this reference name bean and client will communicate.

<jndi-name> XXX </jndi-name>

5  Step : Write JAR file :

jar cvf CalcJar.jar *.class META-INF\.xml

6  Step: Compile JAR file and obtain compiled JAR file :

ejbc CalcJar.jar CalcJar1.jar

8  Step: Deploy the bean: (run from start menu)

start a weblogic 5.1.0 a Utilities a Edit Server Properties
Use Search menu option to locate Weblogic EJB Demo Properties

Write the following statement :

c:\weblogic \myserver \CalcJar1.jar \

9  Step Run weblogic server (run from start menu )

start weblogic 5.1.0 a weblogic Server

Observer the server displays: 1 deployed. 0 failed to deploy

What we have done so far is, we have created the bean and deployed in weblogic server. Now
we can call and use it.

10 Step: to write the client program, compile and run it to call the bean:

//Observe the change in the implementation of business methods

import javax.ejb.*;
import javax.rmi.*;
import javax.naming.*;
import java.util.*;
class CalcClient
{
public static void main(String args[] ) throws Exception
{
Properties p=new Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY, ” weblogic.jndi.T#InitialContextFactory”);
p.put(Context.PROVIDER_RUL, “t3://local:7001″);
//InitialContext() method throws javax.naming.NamingException
Context ctx = new InitialContext(p);
CalcHome chome = (calcHome) ctx.lookup(“SNRao”);
//create() method throws RemoteException and javax.ejb.CreateException
Calc rref = chome.create();

//observe change here
int sum = rref.add(20,5);
int diff = rref.sub();