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Are you using JDK or jrockit. Please mention the version. Also please paste complete error message that you are getting.
We are using jrockit 1.6.0
Please see check below url to tune jrockit JVM.
since you are using jrockit, run a jra/flight recording and see which objects are consuming the heap memory
command to run jra/flight recording is
jrcmd <pid> startjrarecording (old version)
jrcmd <pid> start_flightrecording (new version)
when the issue happens, also try full gc and see if it frees up any memory
jrcmd <pid> runsystemgc full