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a object is tied to the state of the current JVM. There is no context in which a deserialized Thread object would maintain useful semantics.
Secondly, the serialized state of an object forms part of its class' compatibility contract. Maintaining compatibility between versions of serializable classes requires additional effort and consideration. Therefore, making a class serializable needs to be a deliberate design decision and not a default condition.
Lastly, serialization allows access to

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