[jboss-jira] [JBoss JIRA] Updated: (JBRULES-2380) KnowledgeBuilderImpl.add(...) throws org.mvel2.CompileException when executed concurrently for the same resource
Mark Proctor (JIRA)
jira-events at lists.jboss.org
Tue May 17 01:44:04 EDT 2011
[ https://issues.jboss.org/browse/JBRULES-2380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mark Proctor updated JBRULES-2380:
----------------------------------
Fix Version/s: 5.2.0.CR1
(was: 5.2.0.M1)
> KnowledgeBuilderImpl.add(...) throws org.mvel2.CompileException when executed concurrently for the same resource
> ----------------------------------------------------------------------------------------------------------------
>
> Key: JBRULES-2380
> URL: https://issues.jboss.org/browse/JBRULES-2380
> Project: Drools
> Issue Type: Quality Risk
> Security Level: Public(Everyone can see)
> Components: drools-compiler
> Environment: Drools 5.0.1
> core 2 duo @ 2.6 ghz, win xp prof sp3, sun jdk 1.6.0_17
> Pentium Dual CPU E2160 @ 1.8GHz, XP prof SP3, sun jdk 1.6.0_16.
> Reporter: Grigoriy Grigoriev
> Assignee: Edson Tirelli
> Labels: multithreading
> Fix For: 5.2.0.CR1
>
> Attachments: droolsKnowledgeTest.zip
>
>
> Let us assume a multithreaded application, that tries to initialise & start several processes using a StatefulKnowledgeSession in order to use in these processes rule flow. The flow in all the processes is the same but every process instance must have an own StatefulKnowledgeSession instance because of stateful session.
> Actually the problem:
> At the initializing phase occurs an org.mvel2.CompileException exception from time to time at KnowledgeBuilder.add(...):
> Exception in thread "Thread-60" [Error: incomplete statement: (possible use of reserved keyword as identifier: )]
> [Near : {... globals != empt ....}]
> ^
> [Line: 0, Column: 0]
> at org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
> at org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
> at org.mvel2.MVEL.eval(MVEL.java:514)
> at org.mvel2.templates.res.IfNode.eval(IfNode.java:61)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
> at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
> at org.mvel2.templates.res.IfNode.eval(IfNode.java:64)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:195)
> at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:190)
> at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:180)
> at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:169)
> at org.drools.rule.builder.dialect.java.AbstractJavaRuleBuilder.generatTemplates(AbstractJavaRuleBuilder.java:126)
> at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:128)
> at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
> at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
> at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
> at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290)
> at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
> at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
> at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:25)
> at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:53)
> at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
> Caused by: java.lang.NullPointerException
> at org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:113)
> ... 27 more
> Exception in thread "Thread-72" [Error: incomplete statement: (possible use of reserved keyword as identifier: )]
> [Near : {... declarations != empt ....}]
> ^
> [Line: 0, Column: 0]
> at org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
> at org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
> at org.mvel2.MVEL.eval(MVEL.java:514)
> at org.mvel2.templates.res.IfNode.eval(IfNode.java:61)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
> at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
> at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
> at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
> at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:195)
> at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:190)
> at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:180)
> at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:169)
> at org.drools.rule.builder.dialect.java.AbstractJavaRuleBuilder.generatTemplates(AbstractJavaRuleBuilder.java:135)
> at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:128)
> at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
> at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
> at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
> at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290)
> at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
> at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
> at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:25)
> at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:53)
> at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
> Caused by: java.lang.NullPointerException
> at org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:113)
> ... 33 more
> To demonstrate this problem I have created a simple test maven project that reproduces this error (s. attach):
> I have a class that creates & inits stateful knowledge session in a init method (RuleFlowProcess):
> /**
> * inits the rule flow
> */
> public class RuleFlowProcess {
> private StatefulKnowledgeSession ksession;
> public void init() {
> KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
> kbuilder.add(ResourceFactory.newClassPathResource("threadSafeTest.rf"), ResourceType.DRF);
> kbuilder.add(ResourceFactory.newClassPathResource("testRules1.drl"), ResourceType.DRL);
> kbuilder.add(ResourceFactory.newClassPathResource("testRules2.drl"), ResourceType.DRL);
> kbuilder.add(ResourceFactory.newClassPathResource("testRules3.drl"), ResourceType.DRL);
> kbuilder.add(ResourceFactory.newClassPathResource("testRules4.drl"), ResourceType.DRL);
> KnowledgeBuilderErrors errors = kbuilder.getErrors();
> if (errors.size() > 0) {
> StringBuilder errorString = new StringBuilder();
> for (KnowledgeBuilderError error : errors) {
> errorString.append(error);
> }
> throw new RuntimeException(errorString.toString());
> }
> KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
> kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
> ksession = kbase.newStatefulKnowledgeSession();
> }
> ...
> }
> I create & init concurrently in several (200) threads this RuleFlowProcess and some threads crash with this exceptions while adding the resources.
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