ObjectInputStream custom classloader deserialization issue: resolveClass() not called

Question

I have an ObjectInputStream and want to load classes with a custom ClassLoader.

Thus is created a subclass of ObjectInputStream that overrides the resolveClass() function.

Now my problem is that i want to change the ClassLoader during execution. But sometimes resolveClass() does not seem to be executed when I do readObject()on this stream. Then the class is loaded with the wrong ClassLoader.

Any idea why resolveClass() is not executed and how to solve this issue?

Answer 1

resolveClass() will be called once per class descriptor in the stream. I have no idea what would happen if you wrote multiple descriptors for the same full qualified class name - probably unspecified. The correct solution would be to use multiple streams (could be nested within one another).