Hi,
I am struck up with a problem with class loader. I was porting my product from WebLogic to JBoss. The scenario is like this :

My product basically has a client and the server operating at remote machines. The Server provides an interface which is a remote object .
This interface is implemented by the client .

This callbackobject (implemented by the client) is passed as an input parameter to one of the methods of a Session Bean.
When the client calls this method, the server throws...

java.lang.ClassNotFoundException: x.y.sample

ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.net.URLClassLoader$1.run(URLClassLoa
der.java:199)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.security.AccessController.doPrivileg
ed(Native Method)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.net.URLClassLoader.findClass(URLClas
sLoader.java:187)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.lang.ClassLoader.loadClass(ClassLoad
er.java:289)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.lang.ClassLoader.loadClass(ClassLoad
er.java:235)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.invocation.MarshalledValueInput
Stream.resolveClass(MarshalledValueInputStream.java:85)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.io.ObjectInputStream.readNonProxyDes
c(ObjectInputStream.java:1513)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.io.ObjectInputStream.readClassDesc(O
bjectInputStream.java:1435)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.io.ObjectInputStream.readOrdinaryObj
ect(ObjectInputStream.java:1626)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.io.ObjectInputStream.readObject0(Obj
ectInputStream.java:1274)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.io.ObjectInputStream.readArray(Objec
tInputStream.java:1603)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.io.ObjectInputStream.readObject0(Obj
ectInputStream.java:1271)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.io.ObjectInputStream.readObject(Obje
ctInputStream.java:324)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.invocation.MarshalledValue.get(
MarshalledValue.java:78)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.invocation.MarshalledInvocation
.getArguments(MarshalledInvocation.java:324)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.StatelessSessionContainer$C
ontainerInterceptor.invoke(StatelessSessionContainer.java:629)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.resource.connectionmanager.Cach
edConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.plugins.StatelessSessionIns
tanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.plugins.AbstractTxIntercept
or.invokeNext(AbstractTxInterceptor.java:84)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.plugins.TxInterceptorCMT.ru
nWithTransactions(TxInterceptorCMT.java:243)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.plugins.TxInterceptorCMT.in
voke(TxInterceptorCMT.java:104)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.plugins.SecurityInterceptor
.invoke(SecurityInterceptor.java:117)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.plugins.LogInterceptor.invo
ke(LogInterceptor.java:191)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.plugins.ProxyFactoryFinderI
nterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.StatelessSessionContainer.i
nternalInvoke(StatelessSessionContainer.java:322)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.ejb.Container.invoke(Container.
java:674)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.reflect.GeneratedMethodAccessor40.inv
oke(Unknown Source)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.reflect.DelegatingMethodAccessorImpl.
invoke(DelegatingMethodAccessorImpl.java:25)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.lang.reflect.Method.invoke(Method.ja
va:324)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.mx.capability.ReflectedMBeanDis
patcher.invoke(ReflectedMBeanDispatcher.java:284)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.mx.server.MBeanServerImpl.invok
e(MBeanServerImpl.java:549)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at org.jboss.invocation.jrmp.server.JRMPInvo
ker.invoke(JRMPInvoker.java:359)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.reflect.GeneratedMethodAccessor42.inv
oke(Unknown Source)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.reflect.DelegatingMethodAccessorImpl.
invoke(DelegatingMethodAccessorImpl.java:25)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.lang.reflect.Method.invoke(Method.ja
va:324)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.rmi.server.UnicastServerRef.dispatch(
UnicastServerRef.java:261)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.rmi.transport.Transport$1.run(Transpo
rt.java:148)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.security.AccessController.doPrivileg
ed(Native Method)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.rmi.transport.Transport.serviceCall(T
ransport.java:144)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.rmi.transport.tcp.TCPTransport.handle
Messages(TCPTransport.java:460)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at sun.rmi.transport.tcp.TCPTransport$Connec
tionHandler.run(TCPTransport.java:701)
ERROR [RMI TCP Connection(1)-10.18.8.178] (?:?) - at java.lang.Thread.run(Thread.java:534)


some where , i came to know that jboss uses the URLClassLoader concept and that it has a ClassLoaderRepository. I tried to invoke the classLoader, but it doesnot reach that part of the code. Once the call comes to the EJB Container , it throws exception.

In some other documentation....this mbean is said to be put in jboss-service.xml file.


<mbean code="org.jboss.remoting.transport.Connector"
xmbean-dd="org/jboss/remoting/transport/Connector.xml"
name="jboss.remoting:service=Connector,transport=Socket"
display-name="Socket transport Connector">

socket://localhost:8084



<server-side>true</server-side>
<client-side>true</client-side>


org.jboss.mx.remoting.JMXSubsystemInvocationHandler






But , i did not find the jar for this. So , i replaced the handler with
org.jboss.aop.remoting.AOPRemotingInvocationHandler

and checked. when server is started, It says handler not found ....hence quitting.

Then, i have put the above tags . It shows no error but my purpose was not solved.

In some other documentation , i found that .....
these tags in jboss-web.xml should be changed.
<class-loading>
<loader-repository>
weta:confluence=LoaderRepository
<loader-repository-config>
java2ParentDelegation=true
</loader-repository-config>
</loader-repository>
</class-loading>

I have changed true to false. But in vain, my problem is still not solved.
I am using jboss-3.2.1 and j2skd1.4.2. Its working fine with WebLogic.


Any help would be highly appreciated.