[jboss-dev-forums] [Design of the JBoss EJB Container] - Re: jndi lookup during restart

[bstansberry@jboss.com]

Checked in the unit test I discussed on http://www.jboss.com/index.html?module=bb&op=viewtopic&t=114200  . It's org.jboss.test.naming.test.NamingRestartUnitTestCase.

(I was able to track down the thing I was concerned about with deploying a 2nd NamingService and made sure the test didn't cause a problem.)

The problem with HA-JNDI is as you described, Ben -- when HA-JNDI is stopped, the server-side Remote is unexported. The client side NamingContext has a cached refer to the stub to that Remote; invoking on that fails.

I was able to determine why the test doesn't fail with regular JNDI:

1) For regular JNDI, the server-side Remote object is an instance of NamingServer. That instance is cached in a static field NamingContext.localServer.  Thus the server-side object actually survives a restart of the NamingService.

2) NamingService doesn't actually unexport that NamingServer as part of it's stop() processing. From org.jnp.server.Main.stop():


  | if( isStubExported == true )       
  |      UnicastRemoteObject.unexportObject(theServer.getNamingInstance(), false);
  | 

Field "isStubExported" is never set to "true", so the unexportObject call never happens.

Effect is a remote NamingContext still has a valid stub after a restart of the NamingService. If the test actually restarted the server rather than just bouncing a NamingService, it wouldn't work.  This is what happens with Ben's manual test above.  When I modified the test NamingService so it no longer used the static NamingServer in 1) above, the test fails.

Bottom line with all this is we understand the failure mode.

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