How do I enable session support in Google App Engine (Java)?

How do I enable GAE session support using Java?

Also, a related question: I only want to store a small amount of state in sessions (basically, just a key) -- will GAE store this information in a client-side cookie, and if so, how secure is 开发者_如何学JAVAthat approach?

Thanks!

For the first question. In your appengine-web.xml have:

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
  ...
  <sessions-enabled>true</sessions-enabled>
</appengine-web-app>

Please refer this Link provided by in comments in appengine-web.xml:

http://code.google.com/appengine/docs/java/config/appconfig.html#Enabling_Sessions