Cannot allocate memory - Concept Explanation Please

Hello all,
Just wanted to confirm something.
I compile a helloword class and the javac does it job.
Now when I am preparing a larger program from ant like so: /usr/local/ant/bin/ant prepareI get:Buildfile: build.xml
[property] java.io.IOException: java.io.IOException: Cannot allocate memory
[property] at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
[property] at java.lang.ProcessImpl.start(ProcessImpl.java:65)So more memory is required for different compilations of programs, right?
Is there a way, I can allocate all (most) memory to the javac compiler?
If I have some of my theory and terminology mixed please correct me.
Thanks all
---------Key Info-----------
java version "1.5.0_15"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_15-b04)
Java HotSpot(TM) Server VM (build 1.5.0_15-b04, mixed mode)
OS: Fedora 7

Thanks Peter will look into this now.
Before I find the tut/HOWTO is there any chance of the swap file damaging my server? I mean worst case scenario would be...?
Just had a look at "top" and it says "swap" on there, is that referring to something eles: (sucks to be a noob!)
top - 12:32:34 up 14 min, 1 user, load average: 0.00, 0.00, 0.00
Tasks: 35 total,   2 running, 33 sleeping,   0 stopped,   0 zombie
Cpu(s): 0.0% us, 0.1% sy, 0.0% ni, 99.9% id, 0.0% wa, 0.0% hi, 0.0% si
Mem:   8140596k total, 8087960k used,    52636k free,    73708k buffers
Swap: 12578884k total,    28956k used, 12549928k free, 1705984k cachedEdited by: abshirf2 on Oct 2, 2008 7:32 PM
Edited by: abshirf2 on Oct 2, 2008 7:33 PM

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