[rules-users] memory leak in Guvnor 5.3 when rules have incorrect regular expressions ?

[Michael Anstis]

I believe Guvnor may not be at fault, but a potential problem with the
compilation process within Drools Expert.

If you construct a smaller KnowledgeBase from a DRL String containing the
erroneous regular expression does it compile (not using Guvnor)?

Ideally it'd be good to try to construct a DRL String containing all of
your rules outside of Guvnor but this may not be possible as I believe you
are using Guvnor's Decision Tables.

I am just trying to think of a way to find a minimal failing unit test that
the Drools Expert developers may be able to use to trace any problem.

On 3 February 2012 03:07, vadlam <sreeram.vadlamudi at wellsfargo.com> wrote:

> we have hundreds of rules created  in Guvnor 5.3..Final.
>
>  some of them use regular expressions when using the matches operator.
>
> when business users enter an incorrect regular expression and rules are
> built in guvnor subsequently, we have noticed heap  consumption grow quite
> a
> bit and not released subsequenlty.
> currently, on a windows server that has approximately 1.3 GB heap
> available,
> running 1 or builds consumes the whole memory and eventually crashes the
> server.
>
> The following is from one such log trace
>
> [Near : {... **HST ....}]
>               ^
> [Line: 1, Column: 3]
> [Error: Missing left node]
> [Near : {... **HST ....}]
>               ^
> [Line: 1, Column: 3]
>        at
> org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:293)
>        at
> org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)
>        at
> org.drools.rule.builder.PatternBuilder.setInputs(PatternBuilder.java:903)
>        at
>
> org.drools.rule.builder.PatternBuilder.buildRelationalExpression(PatternBuilder.java:599)
>        at
> org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:540)
>        at
>
> org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:398)
>        at
> org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:314)
>        at
> org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:131)
>        at
>
> org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
>        at
> org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:2289)
>        at
> org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:807)
>        at
>
> org.drools.guvnor.server.contenthandler.GuidedDTContentHandler.compile(GuidedDTContentHandler.java:63)
>        at
>
> org.drools.guvnor.server.builder.PackageAssembler.loadAllButDRLAssets(PackageAssembler.java:83)
>        at
>
> org.drools.guvnor.server.builder.PackageAssembler.loadAssets(PackageAssembler.java:73)
>        at
>
> org.drools.guvnor.server.builder.PackageAssembler.buildPackage(PackageAssembler.java:65)
>        at
>
> org.drools.guvnor.server.builder.PackageAssembler.compile(PackageAssembler.java:55)
>        at
>
> org.drools.guvnor.server.RepositoryPackageOperations.buildPackage(RepositoryPackageOperations.java:506)
>        at
>
> org.drools.guvnor.server.RepositoryPackageOperations.buildPackage(RepositoryPackageOperations.java:475)
>        at
>
> org.drools.guvnor.server.RepositoryPackageService.buildPackage(RepositoryPackageService.java:314)
>
> Any thoughts or suggestions around these memory leak issues?
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/memory-leak-in-Guvnor-5-3-when-rules-have-incorrect-regular-expressions-tp3711977p3711977.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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