[jboss-user] [JBoss and NetBeans] - NamingException: Could not dereference object - EJB 3.0 work

[htran_888]

Hi Everyone,

I have stucked on workbook ex05_2 that makes comparison between using the same entity bean in TransactionPersistenceContext & ExtendedPersistenceContext. Anyhow, the following error occurred when trying to access either of these contexts:

javax.naming.NamingException: Could not dereference object [Root exception is java.lang.reflect.UndeclaredThrowableException]
        at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1150)
        at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:705)
        at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587)
        at javax.naming.InitialContext.lookup(InitialContext.java:392)
        at client.Main.main(Main.java:33)
Caused by: java.lang.reflect.UndeclaredThrowableException
        at $Proxy1.createProxy(Unknown Source)
        at org.jboss.ejb3.JndiProxyFactory.getObjectInstance(JndiProxyFactory.java:52)
        at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
        at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1125)
        at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1142)
        ... 4 more

This message make sense considering the jndi listing as follows:

  +- ExtendedPersistenceContextBean (class: org.jnp.interfaces.NamingContext)
  |   +- remote (class: java.lang.Object)
  |   +- remoteStatefulProxyFactory (proxy: $Proxy76 implements interface org.jboss.ejb3.ProxyFactory)
  +- TravelAgentBean (class: org.jnp.interfaces.NamingContext)
  |   +- remote (proxy: $Proxy81 implements interface travelagent.TravelAgentRemote,interface org.jboss.ejb3.JBossProxy,interface javax.ejb.EJBObject)
  +- TransactionPersistenceContextBean (class: org.jnp.interfaces.NamingContext)
  |   +- remote (class: java.lang.Object)
  |   +- remoteStatefulProxyFactory (proxy: $Proxy76 implements interface org.jboss.ejb3.ProxyFactory)

 To call TravelAgentRemote interface, use jndiContext.lookup("TravelAgentBean/remote"). However, it appears that
 I would not get anything by calling either jndiContext.lookup("TransactionPersistenceContextBean/remote") or jndiContext.lookup("ExtendedPersistenceContextBean/remote") according to the above jndi table.

The client code are as follows:

try 
  | 	{
  |             Context jndiContext = getInitialContext();
  |             Object ref = jndiContext.lookup("TravelAgentBean/remote");
  |             TravelAgentRemote dao = (TravelAgentRemote)ref;
  | 
  |             ref = jndiContext.lookup("TransactionPersistenceContextBean/remote");
  |             TransactionPersistenceContextRemote txBean = (TransactionPersistenceContextRemote)ref;
  | 
  | 	    Cabin fetchedCabin = dao.findCabin(1);
  |             int oldBedCount = fetchedCabin.getBedCount();
  | 
  | 	    System.out.println("Set up transaction persistence context stateful bean");
  | 	    txBean.setCabin(1);
  | 	    txBean.updateBedCount(5);
  | 
  |             ref = jndiContext.lookup("ExtendedPersistenceContextBean/remote");
  |             ExtendedPersistenceContextRemote extendedBean = (ExtendedPersistenceContextRemote)ref;
  | 
  |       	    extendedBean.setCabin(1);
  | 	    extendedBean.updateBedCount(5);
  | ....
This exercise does not work as delivered on the command prompt.

I am running Netbeans 5.5, JBoss 4.0.5GA & JDK1.6.0 on Windows XP platform.

The workbook is from EJB 3.0 by Bill Burke.

Any assistance would be greatly appreciated.

Thanks,

Henry


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