Drools invocation in Fuse 6.2.1 leads to OutOfMemory Exception

Solution In Progress - Updated -

Issue

We use Drools in SwitchYard (Fuse on EAP) to convert (Java) Objects between two data models.

In the previous JBoss Fuse Service Works 6.0.0 Version this worked quite well. While testing on Fuse 6.2.1 we found out that some of our Drools Transformations fail with a large Memory consumption. Even on a unit test we found a memory consumption of org.drools.core.reteoo.FromNodeLeftTuple objects of more than 5gb.

Environment

  • Red Hat JBoss Fuse 6.2.1 on EAP
  • Integration Pack for Red Hat JBoss Fuse 6.2.1 on EAP, BRMS 6.2 Update 3 and BPM Suite 6.2 Update 3

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