I'm no programmer... I can hack out ugly code in PHP, Perl, and JavaScript, and that's about it. And I can't answer your question w/ regards to developing in Java...

But... I do know that Eclipse is a general-purpose IDE which happens to be written in Java... You can use Eclipse to develop in other languages by installing the appropriate language plug-in.

I just installed Eclipse last week & I'm going to use it for PHP development...