Google Brings App Engine's Pros and Cons to Java
This addition brings a large set of Java ecosystem related tools, frameworks, and languages (like JRuby and Clojure) along for the ride. However, it also imposes a number of limitations on the GAE Java applications to further Google's ability to scale and cluster them with minimal effort.
via infoq.com
Those limitations are not surprising as inherent to the GAE architecture and strong sandbox. And by the way here is the GAE JRE class white list.
Another limitation not related to Java is with the mandatory use of OAuth with SDC. It is not a limitation per-se, as OAuth is a great services authorization open protocol, but more due to the fact that today OAuth is not a standard for enterprise software.
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