- How much memory do you have allocated to your servers?
- What are your GC flags?
Has your production application fallen over with an OutOfMemoryException for either PermGen or Heap? If not, and your servers have been up for > 1 week, then no, you most likely do not have an issue.
Edit: as commented below, some GC tuning might be in order:
JAVA_OPTS="$JAVA_OPTS -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled"
JAVA_OPTS="$JAVA_OPTS -XX:+AggressiveOpts -XX:+UseFastAccessorMethods"