ObjectInputStream happy with FileInputStream, not happy with getResourceAsStream?

EFBFBD is a UTF-8 representation of Unicode replacement character U+FFFD. So, it looks like file was passed through some encoding conversion process.

There should be no difference at all -- the path you're using for getResourceAsStream() must be finding some other file. Do a search for other files stored as serializedObjects/testObject, and see if you can't find it. Remember that the FileInputStream is going to be looking relative to the current directory, while the getResourceAsStream() is relative to the class path.

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