QueueMetrics does not currently work with GCJ 3 and seems to use a lot of CPU and memory on GCJ 4. GCJ is a free Java compiler/interpreter usually found on most Linux distributions but is not currently 100% compatible yet with the standard Java bundle - see http://gcc.gnu.org/java/.

You should use an industrial-strength Java SDK instead, like the ones from Sun or IBM. Our suggestion is to go for the latest Sun SDK available.