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Editorial Team
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Asked: 2026-05-17T16:24:19+00:00

I’m developing a Java web application on GAE platform in which I’m storing an

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I’m developing a Java web application on GAE platform in which I’m storing an User object in session. When I test my code in local development server (Windows XP + Eclipse), I’m able to get the User object back from the session.

But when I deploy the same piece of code to GAE server, I’m facing issues with Session. I’m able to retrieve the session object but whatever the data I stored in session previously was missing.

Btw, I have enabled the sessions in appengine-web.xml file by using <sessions-enabled>true</sessions-enabled>.

Can anyone tell me if there is something that I’m missing here to use the sessions properly?

PS: I’m using struts2 and my actions implement SessionAware to get the current session in my code.

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1 Answer

  1. Editorial Team

    From the GAE documentation:

    Because App Engine stores session data in the datastore and memcache, all values stored in the session must implement the java.io.Serializable interface.

    Do all of the values you store in session implement Serializable? Any objects referenced by the value you put in the Session must also be serializable – the entire object graph needs to be.

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