Check out scalagwt. They've enhanced GWT to read a protobuf abstract syntax tree so that any language could be compiled to javascript if it can target that output. The first language they have working is Scala, which is far more suited to working with frontend code than java and in my opinion better than javascript. The nice thing about GWT in general is that you get to use a traditional oop approach to maying out the components of a webpage ala java swing.

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