@EJB and RMI stubs

Hi.

Thanks for you reply.

I made about 50 attempts. Sometimes with business interface in my application client jar and sometimes without. It never worked without stubs. It is driving me insane...

Could you outline an appropriate application client structure sample (only which file belongs where)?

Can I simply put my EJB 3.0 Remote business interface as jar file in the root of my application client jar file? Or do I have to embed the interfaces directly as files?

Walter

TheSulibana at 2007-7-14 22:44:03 >

Thanks again.

My source code is nearly identical to the samples at https://glassfish.dev.java.net/javaee5/ejb/EJB30.html. But I can't get it to work.

if I use:

InitialContext ic = new InitialContext();

ssb = (SimpleStatelessBean) ic.lookup("ejb.SimpleStatelessBean");

Item it = ssb.getItem(new Long(45));

everything is working fine. But if i use

@EJB

private static SimpleStatelessBean ssb; // global

Item it = ssb.getItem(new Long(45)); // within main

I always get a NullPointerException.

If I add a test statement to ensure ssb is not null, I always find out that ssb is null:

// within main

if (ssb == null)

System.out.println("null reference");

I added the remote business interface directly to my application client jar like you suggested. But it seems if i use @EJB, my corresponding variable ssb gets never initialized.

Any further ideas what I am doing wrong?

TheSulibana at 2007-7-14 22:44:03 >

I have recreated my projects with the Sless sample code - still with the same problem. Here is the requested code. Thanks for your efforts!

Output of jar tvf SlessApp.jar:

381 Thu Sep 14 17:58:06 CEST 2006 META-INF/application-client.xml

374 Thu Sep 14 17:58:06 CEST 2006 META-INF/sun-application-client.xml

197 Thu Sep 14 17:58:06 CEST 2006 ejb30/Sless.class

927 Thu Sep 14 17:58:06 CEST 2006 ejb30/SlessAppClient.class

59 Thu Sep 14 17:58:06 CEST 2006 META-INF/MANIFEST.MF

Content of application-client.xml

<?xml version="1.0" encoding="UTF-8"?>

<application-client xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

metadata-complete="true" version="5"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/application-client_5.xsd">

<display-name>

SlessApp</display-name>

</application-client>

Content of sun-application.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sun-application-client PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 9.0 Application Client 5.0//EN" "http://www.sun.com/software/appserver/dtds/sun-application-client_5_0-0.dtd">

<sun-application-client>

<java-web-start-access>

<eligible>true</eligible>

</java-web-start-access>

</sun-application-client>

Content of manifest.mf

Manifest-Version: 1.0

Main-Class: ejb30.SlessAppClient

Content of SlessAppClient.java

package ejb30;

import javax.ejb.EJB;

import javax.naming.InitialContext;

import javax.naming.NamingException;

public class SlessAppClient {

@EJB

private static Sless sless;

public static void main(String args[]) throws NamingException {

//It works by uncommenting the following lines!

//InitialContext ic = new InitialContext();

//sless = (Sless) ic.lookup("ejb30.Sless");

System.out.println("Sless bean says : " + sless.hello());

}

}

Content of Sless.java (Remote Business Interface)

package ejb30;

import javax.ejb.Remote;

@Remote

public interface Sless {

public String hello();

}

TheSulibana at 2007-7-14 22:44:03 >

You were right. My original application client jar file contains a metadata-complete="true".

I work with Eclipse / WTP and WTP only supports EJB up to 2.1. So I copied the basic config file content from a NetBeans sample app. I never had thought that the problem could originate from the deployment descriptor. I was looking for the cause of the problem for some days now.

Thank you very very very much!

TheSulibana at 2007-7-14 22:44:03 >