Compiling Java 6 on 10.5.8

[Michael_google gmail_Gersten]

Is it possible to compile Java 6 on 10.5.8?

I'm not concerned about the graphic front-end support (from what I
understand, that has to come from Apple because they modify it for
their system). I'm looking at wanting to compile server-side /
back-end java code.

How much of Java has been open-sourced?
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