[jboss-jira] [JBoss JIRA] Resolved: (JBRULES-2284) OutOfMemoryException at DT loading

[Michael Anstis (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-2284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Anstis resolved JBRULES-2284.
-------------------------------------

    Resolution: Out of Date


I was able to build a KnowledgeBase using the provided file without problem:-

{code}
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
DecisionTableConfiguration dtconf = KnowledgeBuilderFactory.newDecisionTableConfiguration();
dtconf.setInputType( DecisionTableInputType.CSV );
kbuilder.add( ResourceFactory.newClassPathResource( "benchmark20000.csv" ), ResourceType.DTABLE, dtconf );
{code}

> OutOfMemoryException at DT loading
> ----------------------------------
>
>                 Key: JBRULES-2284
>                 URL: https://issues.jboss.org/browse/JBRULES-2284
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-decisiontables
>    Affects Versions: 5.0.1.FINAL
>         Environment: Core2Quad Windows XP Pro 64
>            Reporter: Sergey Vanskov
>            Assignee: Michael Anstis
>             Fix For: 5.3.0.CR1
>
>         Attachments: benchmark20000.csv
>
>
> I have created DT having 20.000 rows with 4 conditions and 1 action in CSV format
> and set the following parameters for JVM -Xmx3072M -XX:MaxPermSize=256M.
> I haveOutOfMemoryException with the following stack trace
> java.lang.OutOfMemoryError: Java heap space
> 	at java.lang.String.format(String.java:2558)
> 	at org.drools.lang.DroolsParserExceptionFactory.formatParserLocation(DroolsParserExceptionFactory.java:203)
> 	at org.drools.lang.DroolsParserExceptionFactory.createErrorMessage(DroolsParserExceptionFactory.java:104)
> 	at org.drools.lang.DroolsParserExceptionFactory.createDroolsException(DroolsParserExceptionFactory.java:89)
> 	at org.drools.lang.DRLParser.reportError(DRLParser.java:350)
> 	at org.antlr.runtime.BaseRecognizer.recoverFromMismatchedToken(BaseRecognizer.java:624)
> 	at org.antlr.runtime.BaseRecognizer.match(BaseRecognizer.java:115)
> 	at org.drools.lang.DRLParser.fact(DRLParser.java:9841)
> 	at org.drools.lang.DRLParser.lhs_pattern(DRLParser.java:9388)
> 	at org.drools.lang.DRLParser.pattern_source(DRLParser.java:7432)
> 	at org.drools.lang.DRLParser.lhs_unary(DRLParser.java:6582)
> 	at org.drools.lang.DRLParser.lhs_and(DRLParser.java:6229)
> 	at org.drools.lang.DRLParser.lhs_or(DRLParser.java:5877)
> 	at org.drools.lang.DRLParser.lhs(DRLParser.java:5673)
> 	at org.drools.lang.DRLParser.normal_lhs_block(DRLParser.java:5580)
> 	at org.drools.lang.DRLParser.when_part(DRLParser.java:3975)
> 	at org.drools.lang.DRLParser.rule(DRLParser.java:3769)
> 	at org.drools.lang.DRLParser.statement(DRLParser.java:993)
> 	at org.drools.lang.DRLParser.compilation_unit(DRLParser.java:484)
> 	at org.drools.compiler.DrlParser.compile(DrlParser.java:238)
> 	at org.drools.compiler.DrlParser.parse(DrlParser.java:78)
> 	at org.drools.compiler.DrlParser.parse(DrlParser.java:83)
> 	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:275)
> 	at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:510)
> 	at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:31)
> ....
> Is 3Gb not enough for such a problem?!
> How may memory requirements be estimated?

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