The GAE is part of the "cloud computing" set of resources such as Amazon Web Services and Microsoft's Azure Services Platform, which use the internet as a huge "virtual" server and application development platform.
Java is integrated into the GAE which is supposed to make it easy for java developers to integrate their technologies into the web hosting environment offered by the "cloud."
A full list of the supported java frameworks is provided, but some developers have had difficulty making their "pure java" apps run smoothly on the GAE.
The GAE is considered by some to be a viable java web host, and it has the added benefit of being free.
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