Verify causes OutOfMemoryError in BRMS 5

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.