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Bug 1067841

Summary: Compiled resource objects leak in KnowledgeAgentImpl.registeredResources
Product: [JBoss] JBoss Enterprise BRMS Platform 5 Reporter: Toshiya Kobayashi <tkobayas>
Component: BRE (Expert, Fusion)Assignee: Nobody <nobody>
Status: CLOSED UPSTREAM QA Contact:
Severity: high Docs Contact:
Priority: unspecified    
Version: BRMS 5.3.1   
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OS: Unspecified   
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Last Closed: 2025-02-10 03:35:09 UTC Type: Bug
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Description Toshiya Kobayashi 2014-02-21 07:23:31 UTC 
Description of problem:

Conditions:
- ChangeSet which points at a directory for DRL files
- Those DRL files have rules for the same package
- newInstance=true

KnowledgeAgentImpl.registeredResources has entries for each DRL files under the directory and holds org.drools.rule.Rule objects which lead to compiled resource objects like org.mvel2.compiler.CompiledExpression, org.drools.rule.DialectRuntimeRegistry etc.

When one DRL file in the directory is updated, the package and kbase is fully updated and the entry in KnowledgeAgentImpl.registeredResources is updated as well. But other entries still retain old org.drools.rule.Rule objects hence related compiled resource objects will not be garbage collected (I believe they are not needed. Correct me if I'm wrong).


Steps to Reproduce:
1. Have a ChangeSet which points at a directory for DRL files
2. Those DRL files have rules for the same package
3. Keep updating different DRL files one by one and let KnowledgeAgent detect one by one

Actual results:

Memory usage keeps growing

Expected results:

Memory usage doesn't keep growing

Additional info:
Comment 1 Toshiya Kobayashi 2014-02-21 07:32:50 UTC 
Sent a pull request as a test case for 5.6.x branch

https://github.com/droolsjbpm/drools/pull/316
Comment 2 Lukáš Petrovický 2014-02-21 11:52:48 UTC 
*** Bug 1067843 has been marked as a duplicate of this bug. ***
Comment 3 Toshiya Kobayashi 2014-03-05 02:05:58 UTC 
There are 2 workarounds:

A. Update the timestamp of all files under the directory which changeset looks at so KnowledgeAgentImpl.registeredResources will be fully updated.

B. Use newInstance=false for KnowledgeAgent.

https://access.redhat.com/site/solutions/744313
Comment 7 Red Hat Bugzilla 2025-02-10 03:35:09 UTC 
This product has been discontinued or is no longer tracked in Red Hat Bugzilla.