Need help understanding JNDI and a specific ClassCastException in J2EE

Question

I have enterprise application A and B deployed (in WLS 10.0). A is the wireframe, B is the client application. The client issues the following calls:

Object o = ctx.lookup(jndiName); // line 1
cf = (ConnectionFactory) o; // line 2

ConnectionFactory is an interface defined as:

public interface ConnectionFactory 
    extends java.io.Serializable, javax.resource.Referenceable {
    ...
}

What's happening:

• If the jar containing the interface class is in the system path, line 2 runs fine
• If the interface class is not in the system class path, but it is packaged separately with applications, line 2 throws a ClassCastException (which contains informative text, which o is ConnectionFactoryImpl)

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:

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• ...:)

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!

Answer 1

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