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How unique serialVersionUID must be? Is not it enough with default one?

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Question: Why it is important to declare explicitly serialVersionUID in classes that implement Serializable interface. I have read that in case of its absence JVM will assign some default serialVersionUID to the class. So, why do I bother about it?

Yes, you are right that missing serialVersionUID will be created by JVM in anyway... The problem is portability of code. Java's main idea is that code works across different platforms and OSs. Java compiler creates default serialVersionUID and its computation is highly sensitive to class details that may vary depending on compiler implementations. Therefore, there is no guarantee that consistent serialVersionUID value across different java compiler implementations will be created. This can result in unexpected InvalidClassExceptions during deserialization.

It is also strongly recommendable that explicit serialVersionUID declarations use the private modifier everywhere it is possible, since such declarations apply only to the immediately declaring class--serialVersionUID fields are not useful as inherited members.

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