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-ha... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

back when using Guvnor 5.2, we had similar problem because the StatefulKnowledgeSession would not dispose of the facts after the response was returned. we had used this simple rule to generate an mvel error one:Fact1( name matches "^[A-Za-Z]+" ) -- View this message in context: http://drools.46999.n3.nabble.com/memory-leak-in-Guvnor-5-3-when-rules-ha... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users