As I just read about the release of JavaFX 2.0 beta and the NetBeans 7.0 plugin in the article JavaFX: The Resurrection (Java FX 2.0 Released), is there information avai开发者_开发问答lable if it runs on Google App Engine for Java?
Client technologies that require GUI (Swing, JavaFX or even JS+HTML/DOM) don't run on servers, because, well, servers don't have screens to display GUI.
JavaFX is a client technology: e.g. it runs as a desktop app or as an applet inside your browser.
Server support is limited to talking to servers via some kind of RPC and, in case of applet, being hosted on a server for users to download. GAE can do both (depends on type of RPC).
GAE deals with the server and according to its spec it only supports Python, Java, Go as a server side technology.
Technologies like JavaFX, Flex, JavaScript etc. are client side technologies. It does not matter what you use in client side its gonna work anyway. As long as GAE is there you have to deal with only Python, Java and Go in order to run on App Engine.
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