ClassLoader problem?
Hi,
I have a problem which seems like a bug to me:
I have two Jboss servers (same version) running on
different computers, from a Stateless session bean I want to
access the same session bean located on the second computer.
The first time I deploy my components every thing works
fine, but if I modify them and redeploy, I have a ClassCastException
that correspond to the line where the first session lookup
the home located in the second computer.
I even used farming to ensure that I really have exactly the
same components deployed.
See code below, and the exception:
package meetings.implementation;
import javax.ejb.*;
import javax.naming.*;
import meetings.interfaces.*;
import java.util.*;
/**
* Created Oct 25, 2002 4:25:15 PM
* Code generated by the Forte For Java EJB Builder
* @author denagbe
*
* @ejb:bean
* name="ClassCastEx"
* description="ClassCastEx Session Bean"
* display-name="ClassCastEx"
* type="Stateless"
* transaction-type="Container"
* jndi-name="meetings/ClassCastEx"
* view-type="remote"
*
* @ejb:util
* generate="physical"
*
* @ejb:transaction type="Never"
*
* @ejb:permission unchecked="true"
*
*
*/
public class ClassCastExBean implements javax.ejb.SessionBean
{
private javax.ejb.SessionContext context;
/**
* @see javax.ejb.SessionBean#setSessionContext(javax.ejb.SessionContext)
*/
public void setSessionContext(javax.ejb.SessionContext aContext)
{
context = aContext;
}
/**
* @see javax.ejb.SessionBean#ejbActivate()
*/
public void ejbActivate()
{
}
/**
* @see javax.ejb.SessionBean#ejbPassivate()
*/
public void ejbPassivate()
{
}
/**
* @see javax.ejb.SessionBean#ejbRemove()
*/
public void ejbRemove()
{
}
/**
* See section 7.10.3 of the EJB 2.0 specification
*/
public void ejbCreate() throws CreateException
{
}
/**
* @ejb:interface-method
*/
public void contact() throws Exception
{
System.out.println("Contacting");
ResourceBundle resourceBundle = ResourceBundle.getBundle("remoteserver");
String jndiURL = resourceBundle.getString("jndiURL");
// Lookup and cache the home references
Properties props = new Properties();
props.setProperty("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
props.setProperty("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
props.setProperty("java.naming.provider.url", jndiURL);
Context ic = new InitialContext(props);
//Look up the Home
ClassCastExHome classCastExHome = (ClassCastExHome)ic.lookup(ClassCastExHome.JNDI_NAME);
ic.close();
ClassCastEx classCastEx = classCastExHome.create();
classCastEx.hello();
}
/**
* @ejb:interface-method
*/
public void hello()
{
System.out.println("Hello world");
}
}
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.ServerException: RuntimeException; nested exception is:
java.lang.ClassCastException
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:536)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:129)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:108)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:77)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:80)
at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:111)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:76)
at $Proxy1.contact(Unknown Source)
at meetings.test.Client.main(Client.java:21)
Caused by: java.rmi.ServerException: RuntimeException; nested exception is:
java.lang.ClassCastException
at org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:369)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:207)
at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContainer.java:313)
at org.jboss.ejb.Container.invoke(Container.java:712)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517)
at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:381)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:536)
Caused by: java.lang.ClassCastException
at meetings.implementation.ClassCastExBean.contact(ClassCastExBean.java:87)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:660)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:77)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:107)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:312)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:60)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:130)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:203)
... 15 more
Exception in thread "main"
Java Result: 1
