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how to know the heap size ?

 
Greenhorn
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hi all,
i m new to java/j2ee and for that sake any IDE .. rite now i hav started using eclipse. at times, it gives me an error that says i m out of heap size memory and that i hav to use the -vmargs -xmx in command line option . wat is this heap memory ? and how do i know how much i m allocated currently and if i really need an increase in the heap size and if yes, the step by step procedure to do it...

thanx in advance.
 
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Moved to the IDEs forum.
 
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