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How much Java can I use with GWT?

I would like to learn GWT, and I like that it compiles in Javascript. My question is how much Java can I really use with GWT? My guess would be that the restrictions apply mainly to the client side, and on the server side I should use any existing Java library, right? Or can I use only a small subset due to compilation in Javascript?

What are the limitations? What interests me is what it cannot do, or things that require too many workarounds to implement. I need to know if GWT training is a good choice for a possible independent medium in web development.

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Website GWT has the documentation to answer that question.

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See JRE emulation docs . These are supported from emulated classes that you can use.

"The Google Web Toolkit includes a library that emulates a subset of the Java runtime library. The list below shows the set of packages, types, and JRE methods that GWT can automatically translate. Note that in some cases only a subset of methods is supported for a particular type."

, <super-source/> gwt.xml, , Java- , JavaScript.

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