Not Serializable Exception with Serializable Class in Java?

Make sure you have a default no-arg constructor.

1 Completely unnecessary. The most derived non-Serializable class needs a no-args constructor accessible to the least derived Serializable class, but no others do. – Tom Hawtin - tackline 2 days ago 2 It's not so much that a serializable class needs a default constructor, but that its first non-serializable superclass does.

– Dave Newton 2 days ago.

How to deserialize a number of objects of the same Class in the same file. In a loop?

Downvoter you must be kidding – EJP yesterday.

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