Verify causes OutOfMemoryError in BRMS 5 - Red Hat Customer Portal

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Issue

After seeing "java.lang.OutOfMemoryError: Java heap space" errors multiple times, JVM options were changed to allow an inital 4GB and maximum 8GB. However, this has not resolved the issue, given that now (only a few days after the increase) the error still occurs. There does not seem to be a consistent trigger for this error.
I get OutOfMemoryError in Guvnor but I didn't run test scenarios in the server, Why?
A heap dump from an OOME on BRMS 5 shows excessive heap retention generated in org.drools.reteoo.JoinNodeLeftTuple while serving some requests.

Environment

Red Hat JBoss BRMS
- 5.2.0
- 5.3.1

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