Java - Google App Engine - InvalidClassException when I change a class that was stored in session sc

Posted by Spines on Stack Overflow See other posts from Stack Overflow or by Spines
Published on 2010-04-08T05:18:57Z Indexed on 2010/04/08 5:23 UTC
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google-app-engine

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java

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session

I updated my User class, and now whenever someone that had the old version of the User class stored in their session scope accesses my site, I get an InvalidClassException.

javax.servlet.ServletException: java.lang.RuntimeException: 
java.io.InvalidClassException: User; local class incompatible: 
stream classdesc serialVersionUID = 4949038118012519093, 
local class serialVersionUID = -971500502189813151

How do I stop this error from happening for those users? I could probably invalidate everyone's sessions every time I want to update a class that gets stored in session scope, but is there a better way, so that my user's don't have to login again?

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