Hi,

I'm making a survey about security in PaaS platforms, and I have a
question about GAE that maybe you can help me with. It is well known
that GAE uses Jetty as the servlet container. However, I have not been
able to find any information about whether each Jetty instance hosts
servlets of one single user or the same Jetty instance can host
servlets of different users at the same time.

I wonder about that because I think it is an important question in
these environments: Java has certain limitations regarding isolation
(possible reference leaks). If the same Jetty instance runs servlets
of different users, then a malicious tenant could try to exploit those
limitations to access to servlets from other users. If, on the other
hand, each Jetty instance runs servlets only from an unique user, then
that problem cannot affect GAE.

Thank you very much for help!, regards,
Luis

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