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What is SerialVersionUID

Emma Brown
admin
#java #serialization
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A few IDEs issue the warnings when SerialVersionUID is missing. Here we check why it is important serialVersionUID.

What is serialVersionUID and why is it important?  Please show an example where missing serialVersionUID will cause a problem.

 

Solution in a Nutshell

The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding sender's class, then deserialization will result in an InvalidClassException.