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closed as not constructive by FrustratedWithFormsDesigner, Adam Crossland, Mark Booth, ChrisF♦ Feb 15 '12 at 15:35
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They provide part of the answer on this page:
In other words, it was a way of getting Java developers to write Ajax-heavy apps.
Java is a compiled language with a variety of mature tools and a large developer community. It has types, objects, exceptions, frameworks, great tools, community support, etc.
There are many "write in one language, run in another" techniques around - but this was a good one.
where neither 'g()' nor 'y' exist. This will only be picked up at runtime.