Hello!
I have 2 news, both good:

On April 7, Google will tell something interesting to the people. Most likely, about Java support on AppEngine. Michael Arrington writes about this in two articles on
www.techcrunch.comReferences to the originals:
Big Google Product Announcement Coming April 7Get Ready For Java On AppEngineWhere did he get the information and how reliable is it - an open question.

Reading articles encouraged me to visit
www.stax.netThe company is engaged in cloud computing in Java. They position themselves as AppEngine for Java.
On their website, you can register and create your project in Java, which will be physically in the Amazon.
So far free')
In order to test everything locally you can and do not register.
To run the SDK, set the JAVA_HOME variable (I, for some reason, had not set the variable for some reason with the jdk installer, had problems with stax sdk)
Not yet released SDK 0.2.17, in which problems with groovy / are solved, new bugs may have been addedCurrent SDK Release 0.2.16