Java Out of Memory Error

Running a parametric sweep of a 2d electrostatic model. Sweeping two parameters results in 80 configurations.
The computer this runs on has 12 Gb of ram.
The analysis never goes over 1 Gb for the Working Set or Virtual Memory
Comsol Version 4.0, Windows 7 64 bit.

Near the end of the run, sometimes, get an error message relating to memory. Here is the last bit from the log:

00611:005 ERROR Exception:
java.lang.OutOfMemoryError: GC overhead limit exceeded
(rethrown as com.comsol.util.exceptions.FlException)
Messages:
Error in sweep: GC overhead limit exceeded
[com.comsol.logger]
00611:005 ERROR Stack trace: [com.comsol.logger]
00633:891 ERROR Exception:
java.lang.ArrayIndexOutOfBoundsException
(rethrown as com.comsol.util.exceptions.FlException)
Messages:

[com.comsol.logger]
00633:906 ERROR Stack trace: [com.comsol.logger]


What is going on, and How do I fix this issue?