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<p class="MsoNormal">We’ve identified a memory leak in Drools when using JPAKnowledgeService.loadStatefulKnowledgeSession.<o:p></o:p></p>
<p class="MsoNormal">We’ve raised the issue here <a href="https://issues.jboss.org/browse/JBRULES-3303?focusedCommentId=12647082#comment-12647082">
https://issues.jboss.org/browse/JBRULES-3303?focusedCommentId=12647082#comment-12647082</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The problem is that the InputMarshaller ends up registering a listener on the knowledge base twice, but only cleans up one of them when the session is disposed. This results in the KnowledgeBase keeping a reference to the session and leaking
memory.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve done an analysis of it and the fix appears to be changing InputMarshaller line 204 from<o:p></o:p></p>
<p class="MsoNormal">session.setKnowledgeRuntime(new StatefulKnowledgeSessionImpl(session));
<o:p></o:p></p>
<p class="MsoNormal">to<o:p></o:p></p>
<p class="MsoNormal">new StatefulKnowledgeSessionImpl(session); <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The sessionImpl calls session.setKnowledgeRuntime() during the constructor.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve attached a fuller explanation to the issue and there is sample code there as well.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It would be great if this could be applied to the 5.3 branch as we need this fix in order to be able to deploy our application.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thomas<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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