Session Bean Client hangs at Context Lookup

[tmccrary]

Hi, I am new to JBoss and I am having a problem.

I created a test session bean and deployed it:

15:44:58,306 INFO [EjbModule] Deploying TestEJB
15:44:58,376 INFO [StatelessSessionInstancePool] Started jboss.j2ee:jndiName=TestEJB,plugin=pool,service=EJB
15:44:58,377 INFO [StatelessSessionContainer] Started jboss.j2ee:jndiName=TestEJB,service=EJB
15:44:58,377 INFO [EjbModule] Started jboss.j2ee:module=TestEJB.jar,service=EjbModule
15:44:58,377 INFO [EJBDeployer] Deployed: file:/opt/jboss/server/default/deploy/TestEJB.jar
15:44:58,391 INFO [MainDeployer] Deployed package: file:/opt/jboss/server/default/deploy/TestEJB.jar

But whenever I run the client, it hangs at the context lookup forever. There are no exceptions thrown, it just sits there.

Here is the code I am using:

Remote Interface

package com.test.ejbtest;

import java.rmi.RemoteException;

import javax.ejb.EJBObject;

/**
 *
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public interface TestEJB extends EJBObject {

 public String test() throws RemoteException;

}

Home Interface

package com.test.ejbtest;

import java.rmi.RemoteException;

import javax.ejb.CreateException;
import javax.ejb.EJBHome;

/**
 *
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public interface TestEJBHome extends EJBHome {

 TestEJB create() throws RemoteException, CreateException;

}

EJB

package com.test.ejbtest;

import java.rmi.RemoteException;

import javax.ejb.EJBException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;

/**
 *
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class TestEJBBean implements SessionBean {

 /* (non-Javadoc)
 * @see javax.ejb.SessionBean#ejbActivate()
 */
 public void ejbActivate() throws EJBException, RemoteException {
 // TODO Auto-generated method stub

 }

 /* (non-Javadoc)
 * @see javax.ejb.SessionBean#ejbPassivate()
 */
 public void ejbPassivate() throws EJBException, RemoteException {
 // TODO Auto-generated method stub

 }

 /* (non-Javadoc)
 * @see javax.ejb.SessionBean#ejbRemove()
 */
 public void ejbRemove() throws EJBException, RemoteException {
 // TODO Auto-generated method stub

 }

 /* (non-Javadoc)
 * @see javax.ejb.SessionBean#setSessionContext(javax.ejb.SessionContext)
 */
 public void setSessionContext(SessionContext arg0) throws EJBException,
 RemoteException {
 // TODO Auto-generated method stub

 }

 public String test() {


 System.out.println("Testing the EJB on JBoss");

 return "Testing EJB ";

 }

 public void ejbCreate() {

 System.out.println("ejbCreate");

 }

}

EJB Descriptor

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

<ejb-jar>

 <description>JBoss Test EJB</description>
 <display-name>Test EJB</display-name>
 <enterprise-beans>

 <session>

 <ejb-name>TestEJB</ejb-name>
 <home>com.nd.ejbtest.TestEJBHome</home>
 <remote>com.nd.ejbtest.TestEJB</remote>
 <ejb-class>com.nd.ejbtest.TestEJBBean</ejb-class>
 <session-type>Stateless</session-type>
 <transaction-type>Bean</transaction-type>

 </session>

 </enterprise-beans>

</ejb-jar>

Any help would be much appreciated :)

[tmccrary]

Also, my client app:

package com.test.ejbtest;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.InitialContext;

/**
 *
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class TestClient {

 public static void main(String[] args) {


 Hashtable env = new Hashtable();
 env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
 env.put(Context.PROVIDER_URL, "marge.ndindustries.com:1099");
 env.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");

 System.out.println("Attempting connection to server...");

 try
 {

 System.out.println("A");

 Context ctx = new InitialContext(env);

 System.out.println("B");

 Object obj = ctx.lookup("TestEJB");

 System.out.println("C");

 TestEJBHome home = (TestEJBHome)javax.rmi.PortableRemoteObject.narrow(obj, TestEJBHome.class);

 TestEJB testejb = home.create();

 System.out.println("The server said" + testejb.test());

 testejb.remove();

 }

 catch (Exception e) {

 e.printStackTrace();
 System.out.println( "Exception: " + e.getMessage() );

 }

 }
}

[gaurav.singh]

I had the same issue trying to connect remotely to the JBoss Server.


You might want to check a few things

1) Check if you can resolve marge.ndindustries.com by pinging the domain host


telnet marge.ndindustries.com for the default common ports that are used by JBoss like 1099, 1098,4444,4445 . One of them might have another process listening on it and as aresult your client is timing out

Hope that helps..

Regards
G

[mlapolla]

I have a question about this:

I modified the Duke's Bank to include a very simple object called SimpleEJB, with JNDI name MySimpleEJB and with a ref that was
ejb/Simple.

When I got the default initial context, it worked just great using

initial.lookup("java:comp/env/ejb/Simple");

However, when I tried this:

Hashtable env = new Hashtable();
env.putContext.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
env.put(Context.PROVIDER_URL, "jnp://localhost:1099");
env.put"java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
InitialContext initial2 = new InitialContext(env);
Object objref2 = initial2.lookup("ejb/Simple");

It didn't work. It said it couldn't deference it and that was part of a NameNotFoundException because ejb was not bound.

However, if I change that last line to read:

Object objref2 = initial2.lookup("MySimpleEJB");

It worked just great. Do I always have to use the JNDI name when not using the java:comp/env? That is, accessing a remote bean. I thought that JBoss would do that making using the refs.

What I am trying to do is modify another war file I have to use an session bean but I am having trouble getting the bean even by the JNDI name. The war file I am using does include the bank-ejb.jar, I put it in there to try it out, and there is no way I can look up that bean.

Some hints would help. Do I need the clientall-jboss.jar for the JNDI look up? I've been reading up on the Jboss JNDI but so far the book I am using, SAMS JBoss, says that I am settng up everything correctly.

Thanks.

[pgajria]

similar issue with the jboss fibo example

in your code you have

initial.lookup("java:comp/env/ejb/Simple");

on the jboss examples they use
context.lookup("java:/comp/env/ejb/Fibo");

is that leading / needed or not ?

regardless i was never able to get their example
to work

also i get a lot of lookup of java:/comp/env failed
tomcat errors when trying to run my own examples
sometimes it will run & when i rerun the xdoclet & packing
& redeploy it fails

im not sure if this is a jboss issue or a tomcat issue

btw the ejbs do display correctly in the jmx-console
its the servlets that cant call them

[mlapolla]

If I used java:comp/env it worked just fine when the bank-ejb.jar was part of the .ear.

I am having trouble using the URL to look up other ejbs that are not part of a war or ear. (See my last posting.) Those ejbs that are, in the same JVM but not in the same project.

The error I keep on getting is:

javax.naming.NamingExc
eption: Could not dereference object [Root exception is javax.naming.Communicati
onException [Root exception is java.lang.ClassNotFoundException: com.sun.ebank.e
jb.account.SimpleHome (no security manager: RMI class loader disabled)]]

Thanks.