Error while calling EJB

[aadhar sharma]

Hi,

I am creating a stateless session bean using JBoss 4 server and JDK 6.0

I receive the folowing error when I try to call the EJb from my Java Application

below is the trace i have attached my jboss.xml jndi and ejb-jar.xml.


Exception in thread "main" javax.naming.CommunicationException [Root exception is java.io.InvalidClassException: org.jboss.ejb3.session.BaseSessionRemoteProxy; local class incompatible: stream classdesc serialVersionUID = 8310915813626447181, local class serialVersionUID = 2609262789016232311]
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:722)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587)
at javax.naming.InitialContext.lookup(Unknown Source)
at client.Client.main(Client.java:26)
Caused by: java.io.InvalidClassException: org.jboss.ejb3.session.BaseSessionRemoteProxy; local class incompatible: stream classdesc serialVersionUID = 8310915813626447181, local class serialVersionUID = 2609262789016232311
at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at java.rmi.MarshalledObject.get(Unknown Source)
at org.jnp.interfaces.MarshalledValuePair.get(MarshalledValuePair.java:72)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:652)
... 3 more




<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
version="3.0">
<description>JBoss Stateless Session Bean Tutorial</description>
<display-name>JBoss Stateless Session Bean Tutorial</display-name>
<enterprise-beans>
<session>
<ejb-name>Calculator</ejb-name>
<remote>statelessExamples.CalculatorRemote</remote>
<local>statelessExamples.CalculatorLocal</local>
<ejb-class>statelessExamples.CalculatorBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
</ejb-jar>



<?xml version="1.0"?>
<jboss
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://www.jboss.org/j2ee/schema/jboss_5_0.xsd"
version="3.0">
<enterprise-beans>
<session>
<ejb-name>Calculator</ejb-name>
<jndi-name>statelessExamples.CalculatorRemote</jndi-name>
<local-jndi-name>statelessExamples.CalculatorLocal</local-jndi-name>
</session>
</enterprise-beans>
</jboss>




package client;

import java.util.Properties;

import javax.naming.InitialContext;

import stateless.Calculator;
import stateless.CalculatorRemote;

public class Client {
public static void main(String[] args) throws Exception {

Properties p = new Properties();
p.put("java.naming.factory.initial",
"org.jnp.interfaces.NamingContextFactory");
p.put("java.naming.factory.url.pkgs",
"org.jboss.naming rg.jnp.interfaces");
p.put("java.naming.provider.url", "localhost:1099");

// System.setProperty("java.naming.factory.initial",
// "org.jnp.interfaces.NamingContextFactory");
// System.setProperty("java.naming.factory.url.pkgs","org.jboss.naming rg.jnp.interfaces");
// System.setProperty("java.naming.provider.url", "localhost:1099");

InitialContext ctx = new InitialContext(p);
Calculator calculator = (Calculator) ctx.lookup("statelessExamples.CalculatorRemote");

System.out.println("1 + 1 = " + calculator.add(1, 1));
System.out.println("1 - 1 = " + calculator.subtract(1, 1));
}
}



Thanks and Regards

Aadhar Sharma

[Jaikiran Pai]

Looks like you have incorrect JBoss jar files in the classpath of the client. You should have the same JBoss jar files as what you have on the server. Copy the jbossall-client.jar file from the %JBOSS_HOME%/client folder to your application's (client's) classpath and remove the other JBoss jar files.

[aadhar sharma]

Thanks a Ton Jai

Worked out for me

[Kelly Wei]

It fixed it for me too!

Basically the client application needs the jbossall-client.jar from the jboss server that the ejbs are deployed under. I had multiple JBoss instances so that make it hard to find out what was wrong.

You da man!

BTW, Aadhar, I didn't have to put anything in jboss.xml and ejb-jar.xml, all I did was this:

 
@Stateless
@RemoteBinding(jndiBinding="ejb/remote/ParameterServiceBean")
public class ParameterServiceBean implements ParameterServiceBeanLocal,
ParameterServiceBeanRemote{ ... }
 
 

http://docs.jboss.org/ejb3/app-server/tutorial/jndibinding/jndi.html
[ February 24, 2008: Message edited by: Kelly Wei ]

[Jenny George]

Worked for me too. Thanks

[B Misra]

This thread helped me to solve some problems , but I am reviving this old post because-
Though getting the same jboss jar file in client as from server solved the issue , I am confused with the reason of this.
someone please through some light why is it so much dependent on server jars for a remote jndi lookup.

[Christian Dillinger]

Because Client and Server communicate via serialized objects they need the same version of certain classfiles. The exception you got is about two different versions (detected via serialVersionUID).