Porting EJB2.1 Statefull Session Bean to EJB3

[adrian_p]

Hello,

I'm currently trying to port some tutorial bean into EJB3. I have to mention that i'm a beginner.

The bean i want to port is showing the instantiate, pasivate, activate mechanism in statefull session beans.

It's a very simple bean and client... My problem is related to ejbCreate method and it's related create method in old EJB2.1 home interface.
I don't know how to do this in EJB3. I've looked everywhere. Also i've read a couple of times the referring section in EJB3 Public Review Core Documentation but i've found nothing.

Here's the code i want to port:

CountHome.java

package examples;
import javax.ejb.*;
import java.rmi.RemoteException;

public interface CountHome extends EJBHome {

 Count create(int val) throws RemoteException, CreateException;
}

Count.java

package examples;

import javax.ejb.*;
import java.rmi.RemoteException;

public interface Count extends EJBObject {
 public int count() throws RemoteException;
}

CountBean.java

package examples;
import javax.ejb.*;

public class CountBean implements SessionBean {

 public int val;

 public int count() {
 System.out.println("count()");
 return ++val;
 }

 public void ejbCreate(int val) throws CreateException {
 this.val = val;
 System.out.println("ejbCreate()");
 }

 public void ejbRemove() {
 System.out.println("ejbRemove()");
 }

 public void ejbActivate() {
 System.out.println("ejbActivate()");
 }

 public void ejbPassivate() {
 System.out.println("ejbPassivate()");
 }

 public void setSessionContext(SessionContext ctx) {
 System.out.println("setSessionContext()");
 }
}

CountClient.java

package examples;

import javax.ejb.*;
import javax.naming.*;
import java.util.Properties;


public class CountClient {

 public static final int noOfClients = 3;

 public static void main(String[] args) {

 try {

 Properties props = System.getProperties();

 Context ctx = new InitialContext(props);
 CountHome home = (CountHome)javax.rmi.PortableRemoteObject.narrow(ctx.lookup("CountHome"), CountHome.class);

 Count count[] = new Count[noOfClients];

 int countVal = 0;
 System.out.println("Instantiating beans...");
 for (int i=0; i < noOfClients; i++) {
 count = home.create(countVal);
 countVal = count.count();
 System.out.println(countVal);
 Thread.sleep(500);
 }

 System.out.println("Calling count() on beans...");
 for (int i=0; i < noOfClients; i++) {
 countVal = count.count();
 System.out.println(countVal);
 Thread.sleep(500);
 }
 for (int i=0; i < noOfClients; i++) {
 count.remove();
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
}

I hope someone can help me with this...

Thanks a lot in advance...
Adrian

[bill.burke]

Turn your ejbCreate method into a business interface method. EVery time you look up a SFSB within JNDI a new session is created for you. Just invoke the new intialize method you create before you continue doing the rest of your business logic.

[adrian_p]

Thanks Bill,

I think I've tried that but i'll do it again. I hope this time will work.
I was searching for a solution to this problem and i've found some oracle tutorials related to making an EJB3 bean compatible with EJB2.1 clients

They were using an @RemoteHome annotation from javax.ejb.RemoteHome.
It was used like this

@RemoteHome(home="example.CartHome",remote="example.Cart")

i've found it also in Jboss EJB3 implementation in org.jboss.annotation.ejb.RemoteHome

Please, can you tell me how to use it? I think that jboss implementation is different from the one in the mentioned oracle tutorial.


Thanks in advance

[bill.burke]

Yes, I believe we support @RemoteHome

You have to use it in conjection with the @Init annotation. So, youre ejbCreate method must be annotated with @Init and

The jBoss one is different because we actually follow the spec I believe...