When do remote interface get invaliated? Can I cache them?

Question

Hello,
I am designing an application, and considering using the "Service Locator" pattern, acting as a singleton that will cache jndi context, and bean home and remote interfaces. However I am unsure whether caching of remote interface is a problem or not:
1) Under what circumstances will the cached remote interface for a stateless session bean be invalidated?
2) Under what circumstances will the cached remote interface for an Entity Bean be invalidated?
3) Assuming that I cache Stateful session bean remote interfaces in a Servlet HTTPSESSION, under what circumstances will the cached remote interface for Stateful session bean be invalidated?
4) Finally, do I have to utilise home handles instead of remote interfaces for any of these situations? If so, why?
Thanks

Answer 1

I understand that caching the Home Interface or HomeHandle of this, is the solution for
reconnection to EJB's problems.
But I do not succeed in getting a working solution for handling the reconnection
to a restarted EJB server after some downtime.
First the HomeHandle of the Home Interface is successfully saved with:
"myHomeHandle = myHome.getHomeHandle();"
Later the HomeHandle is used to restore the Home Interface with:
"MyHome myHome = (MyHome) myHomeHandle.getEJBHome();"
But this gives an Exception like
Caused by: javax.naming.NoInitialContextException: Need to specify class name in environment or system property,
or as an applet parameter, or in an application resource file: java.naming.factory.initial
I have followed the recommandations in this postings, but in some way I lack a bit information.
Has somebody a code example in Java of how to do this?
Here is my code which throws the exception
InitialContext context = new InitialContext( properties );
Object obj = context.Lookup( "My" );
MyHome myHome = (MyHome) PortableRemoteObject.narrow( obj, MyHome.class );
myBean = myHome.create();
myHomeHandle = myHome.getHomeHandle();
// At this point everything fine, and a myBean is created.
// Now I try to recreate the myHome Interface
MyHome myHome = (MyHome) myHomeHandle.getEJBHome();
// In order to (re)create the myBean EJB.
myBean = myHome.create();
// But the second create is never executed, as the method call "...myHomeHandle.getEJBHome();"
throws the above Exception.
So, any help I will Appreciate.