CruiseControl / Dashboard crashes several times/day...

[cpjust]

Hi,
We're using CruiseControl & Dashboard for our automated build servers and it has been getting lots of OutOfMemory errors, even though we start the process with: -Xms1024m -Xmx1024m -Xss2m

There appears to be plenty of free memory from the report below:

Heap
 PSYoungGen      total 319616K, used 28682K [0xe6400000, 0xfbc00000, 0xfbc00000)
  eden space 286080K, 6% used [0xe6400000,0xe75222e8,0xf7b60000)
  from space 33536K, 33% used [0xf9b40000,0xfa6205a0,0xfbc00000)
  to   space 32640K, 0% used [0xf7b60000,0xf7b60000,0xf9b40000)
 PSOldGen        total 700416K, used 14561K [0xbb800000, 0xe6400000, 0xe6400000)
  object space 700416K, 2% used [0xbb800000,0xbc638720,0xe6400000)
 PSPermGen       total 32768K, used 29764K [0xb7800000, 0xb9800000, 0xbb800000)
  object space 32768K, 90% used [0xb7800000,0xb95110e8,0xb9800000)

So I'm wondering if it may be due to memory fragmentation, and if anyone else has seen this problem, how do you fix it?