Cannot get my first EJB 3.0 to work!!!

[seahsherley]

Hi guys,

I have created a interface....

package examples.session.stateful;

public interface Count
{
public int count();
public void set(int val);
public void remove();
}

Then I have created a Stateful Bean to implements the above interface

@Stateful(name = "CountingBean")
@Remote(Count.class)
@Interceptors(CountCallbacks.class)
public class CountBean implements Count
{
...........
}

I have deploy eveything in the jboss and run my client

Count obj = (Count)ctx.lookup("CountingBean");

It give a ClassCastException....

When i ran the JMX-Console.... and click on the JNDIVIEW and click on the INVOKE button under the method list..... on the page display... I see the following:

.......
+- CountingBean (class: org.jnp.interfaces.NamingContext)
| +- remote (class: java.lang.Object)
| +- remoteStatefulProxyFactory (proxy: $Proxy72 implements interface org.jboss.ejb3.ProxyFactory)
........

My question is... how come the CountingBean is not of class Count?????

Thanks a million!!!!

[clebert.suconic]

do like this

@Remote
public interface Count
{
public int count();
public void set(int val);
public void remove();
}


@Stateful(name = "CountingBean")
public class CountBean implements Count
{
...........
}




Then add the interceptors back.


You missed the annotation on the interface.

[alrubinger]

Just a quick glance, but this stands out...

Count obj = (Count)ctx.lookup("CountingBean");

...and your JNDI tree shows you:

+- CountingBean (class: org.jnp.interfaces.NamingContext)
| +- remote (class: java.lang.Object)
| +- remoteStatefulProxyFactory (proxy: $Proxy72 implements interface org.jboss.ejb3.ProxyFactory)

Your proxy should be stored under "CountingBean/remote". So try:

Count obj = (Count)ctx.lookup("CountingBean/remote");

Don't know if you've seen the EJB3 Trailblazer yet, but if not, it's really a great starting point with working examples for simple EJB3s:

http://trailblazer.demo.jboss.com/EJB3Trail/serviceobjects/slsb/index.html

S,
ALR

[seahsherley]

Thanks for your reply...

I have tried adding @Remote to the interface class, it wont work...

I tried to use ctx.lookup("CountingBean/remote") it returns a javax.naming.Reference object.... I am expecting a Count object.

[alrubinger]

Couple things, and again - just looking quickly:

CountBean is remote...have it implement Serializable...

But also check the JARs you're including on your client classpath - are you including jbossall-client.jar?

S,
ALR

[georges.goebel]

Hi,

I have exactly the same problem. I have one stateless and one statefull session bean. But in the jndi view is see (class: java.lang.Object) for the local and remote interface of the sfsb. For the slsb the proxy implements the correct interface.
I tried to add the @Local or @Remote to the interface or class, adding jndibinding and a lot of other things. But I cannot get it to work.
I cannot get a session bean from a client (fat client or servlet in the same ear). I always get a proxy classcast exception.
Is there a bug some where because I read the same problem on several places.

Thanks for any help

[georges.goebel]

Hi,

I solved my problem by packaging the web application without the ejb classes. The ejb3 (session beans and entity beans) classes where 2 times in the ear. In the jar and the war file. After packageing them only in the jar it workes for me

[georges.goebel]

"georges.goebel" wrote:
Hi,

I solved my problem by packaging the web application without the ejb classes. The ejb3 (session beans and entity beans) classes where 2 times in the ear. In the jar and the war file. After packageing them only in the jar it works for me

[kpiis]

Hello all,
I have the same question:
After deploying my statefull bean I get the ClassCastException
In JNDI view it's binded in such way
+- StatefullBean (class: org.jnp.interfaces.NamingContext)
| +- localStatefulProxyFactory (class: org.jboss.ejb3.stateful.StatefulLocalProxyFactory)
| +- local (class: java.lang.Object)

I am looking for the bean from servlet, StatefullBean class is not stored in servlet' WAR.

StatefullBean b = (StatefullBean)con.lookup("StatefullBean/local");
java.lang.ClassCastException: $Proxy250

With stateless beans I am working in the same way but without errors.

What I'm doing wrong?

[kpiis]

O, my bad -
IStatefullBean b = (IStatefullBean)con.lookup("StatefullBean/local")
it's correct.