I'am using The CosNaming provider.
Calling new InitialContext().bind(...) make a new ORB instance to be created.
This instance is never cleanup. The number of ReaderThread used increases.
I provide a simple test case that shows the problem.

 // Step 1: Instantiate the Hello servant
            HelloImpl helloRef = new HelloImpl();

while(true) {
                Context initialNamingContext = new InitialContext();
initialNamingContext.rebind("HelloService", helloRef );
initialNamingContext.close();
System.out.println("Press a key to continue. Check thread stack");
System.in.read();
}