Problem Migrating to AS5 with rmi

[pinkushn]

I am testing an app using JBoss and Eclipse. Remoting code that was working in JBoss 4.2 stopped working when I recently moved to 5.0. Now my clients get a ClassCastException when trying to access remote interfaces. Do I need to change jndi properties?

Here is jndi.properties:

### JBossNS properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.provider.url=jnp://localhost:1099
java.naming.factory.url.pkgs=org.jboss.naming\:org.jnp.interfaces


Here's code:

Object o = ic.lookup("BigMathEAR/Login/remote");
LoginRemote lr = (LoginRemote) PortableRemoteObject.narrow(o, LoginRemote.class);

and here's the stack:

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
at com.getmoremath.login.Controller.login(Controller.java:43)
at com.getmoremath.login.View$6.actionPerformed(View.java:271)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.AbstractButton.doClick(AbstractButton.java:337)
at com.getmoremath.util.ViewUtil$3.actionPerformed(ViewUtil.java:166)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2884)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
at java.awt.Component.processEvent(Component.java:5818)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
at java.awt.Component.dispatchEventImpl(Component.java:4285)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Caused by: java.lang.ClassCastException: javax.naming.Reference cannot be cast to org.omg.CORBA.Object
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:212)
... 35 more

Thanks for any advice.

[alrubinger]

Caused by: java.lang.ClassCastException: javax.naming.Reference cannot be cast to org.omg.CORBA.Object

A cast from a naming reference is a red flag you don't have the EJB3 proxy classes in your client classpath. Check that you're got jbossall-client.jar on there.

Also, with EJB3 business interfaces there's no need for the PortableRemoteObject nonsense, just d a plain cast. EJB2.x is a different story. ;)

S,
ALR

[pinkushn]

Thanks. You were right: I needed the jbossall-client.jar in my client's path.

Also, I didn't know we could shed the 'narrowing' business -- I am a confused muddle of ejb2 and 3, having entered the scene with JBoss 4.2 and tried to use ejb 3 as much as possible. So thanks for the bonus point!

jb