问题
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?
回答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).
回答2:
From Java API doc for ObjectInputStream.resolveClass():
This method will be invoked only once for each unique class in the stream.
Possible quick&dirty fix:
Always call reset() on the ObjectOutputStream after sending.
This will reset the streams as if they were new and make them forget about having sent/received a class already.
来源：https://stackoverflow.com/questions/14385997/objectinputstream-custom-classloader-deserialization-issue-resolveclass-not-c