What is the operating environment of App Inventor?

What is the operating environment of ai2.appinventor.mit.edu? Appengine-java-sdk + jdk ?
Thank you for your reply.

(post edited by Taifun)

You also need ant to build App Inventor.
And you should write the question in the post not in the title.

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Yes, for ai2 we are using the Google App Engine Standard environment running Java 8.

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