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Serializable interface implementation

Mansukhdeep Thind
Ranch Hand

Joined: Jul 27, 2010
Posts: 1157


Whenever we implement the Serializable interface while writing a JavaBean class, I have seen that invariably it contains the following line of code:

What is the meaning of and purpose of writing this?

~ Mansukh
harshvardhan ojha
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Joined: Jul 26, 2007
Posts: 157

This is meant to keep version for your class so that it won't try to deserialize objects having incompatible versions. otherwise it will throw InvalidClassExceptions for incompatible versions.
Campbell Ritchie

Joined: Oct 13, 2005
Posts: 37902
That actually means that you are using an IDE where you have set an option to include an “default” SUID number in every Serializable class. I think you should take that option off.

Look here, where you will find links to discussion of serialisation, which will help explain what an SUID is.
Campbell Ritchie

Joined: Oct 13, 2005
Posts: 37902
Another discussion here. See which is the links I quoted is better.
It is sorta covered in the JavaRanch Style Guide.
subject: Serializable interface implementation
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