class java.lang.ClassCastException in EJB3.0 lookup

[harish.vamsh]

Hi All,

I'm trying to invoke a sample HelloBean EJB 3.0 in JBOSS 4.2.2. But getting following error
-------------------ERROR -----------------
11:20:53,187 WARN [RequestProcessor] Unhandled Exception thrown: class java.lang.ClassCastException
11:20:53,187 ERROR [[action]] Servlet.service() for servlet action threw exception
java.lang.ClassCastException: $Proxy63 cannot be cast to examples.session.stateless.Hello
------------------------------------------
EJB jar file deployment was successful.

Trying to lookup in my servlet as shown below, which throws above stated error

Hello hello = (Hello) ctx.lookup("HelloBean/remote");

However, on calling
System.out.println("--->"+ctx.lookup("HelloEJB/remote"));
outputs
--->jboss.j2ee:jar=firstEJB3.jar,name=HelloEJB,service=EJB3

It is unable to cast it to the Remote interface.

Can anyone help me?.

Thanks in advance

[jaikiran]

See this http://www.jboss.org/community/docs/DOC-9280 for possible reasons for the classcastexception. I guess you are packaging the EJB interfaces both in the WAR and in the EJB jar. If so, then remove those interfaces from the WAR.

[harish.vamsh]

Hi Jaikiran,

Thanks for your reply.

Yes i do have remote interface in my exploded war folder. If i remove this interface, the servlet containing the lookup doesn't compile (Since Hello can't be resolved).

Please lemme know how to resolve this.

Thanks
Harish

[peterj]

You need to include the EJB JAR file in the classpath when you compile your servlet.

[harish.vamsh]

Hi Peter,

Yes, it worked. Thanks a lot for your help. EJB3.0 has made it very simpler.
Can you share any resources on EJB3.0, if you have?

Thanks again
Harish

[peterj]

How about Enterprise Java Beans, 4th Edition: http://oreilly.com/catalog/9780596005306/

Be aware that the JBoss AS-specific sections in that book are a little dated (based on 4.0.4 with added EJB3 support).

[alrubinger]

I think you want 5th Edition. ;)

http://oreilly.com/catalog/9780596009786/?CMP=AFC-ak_book&ATT=Enterprise+JavaBeans+3.0

...which covers EJB 3.0.

S,
ALR

[peterj]

Thanks for catching that, Andrew! I saw Bill's name on the list of authors and thought it was the EJB 3.0 version!

[sarpesh]

Hi friend's

i am calling my ejb class using this code
public class Client
{

public static void main(String[] args) throws Exception
{
CalculatorRemote calculator =null;
Properties properties = new Properties();
properties.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
properties.put("java.naming.provider.url", "jnp://localhost:1099");
properties.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
properties.put("jnp.socket.Factory", "org.jnp.interfaces.TimedSocketFactory");
Context ctx = new InitialContext(properties);
CalculatorRemote obj = (CalculatorRemote)ctx.lookup("CalculatorBean/remote");
System.out.println("1 + 1 = " + calculator.add(1, 1));
System.out.println("1 - 1 = " + calculator.subtract(1, 1));
}
}


but always get this exception
Exception in thread "main" java.lang.ClassCastException: javax.naming.Reference cannot be cast to org.jboss.tutorial.stateless.bean.CalculatorRemote
at org.jboss.tutorial.stateless.client.Client.main(Client.java:26)

i am using jboss-5.1.0.GA and jdk1.6
please help me

[jaikiran]

sarpesh,

Please create a separate thread in this forum to discuss this. That way we won't end up discussing multiple unrelated issues in one thread.