I am assuming you are programming your application on Glassfish?
Please refer heap sizing section here
http://java.sun.com/performance/reference/whitepapers/tuning.html
Also you may want to refer,
http://java.sun.com/docs/hotspot/HotSpotFAQ.html#gc_heap_32bit
You can increase the heap size with -Xmx jvm option.
-Bharath
>We are programming an application that requires to work with 3 Gb of heap
>memory from a java virtual machine but, in spite we had prove with the
>Xmx parameter in order to obtain the said necessary memory level, we had
>only obtained 64 Mb (we had used MemoryMXBean and MemoryUsage in order to
>know the disposed memory level)
>
>Please, would you tell us how to increase the heap memory level at the
>java virtual machine?
>
>
>
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