RuntimeException while building KieBase with BRMS 6.2.0

Solution In Progress - Updated -

Environment

  • Red Hat JBoss BRMS
    • 6.2.0

Issue

We are trying to build the KieBase from rule files and loading into memory:

KieServices ks = KieServices.Factory.get();
KieFileSystem kfs = ks.newKieFileSystem().generateAndWritePomXML(releaseId);
kfs = listFiles(ruleFiles,kfs);
KieBuilder kBuilder = ks.newKieBuilder( kfs );
Results result = kBuilder.buildAll().getResults();

We are getting the following exception:

java.lang.RuntimeException
        at org.drools.compiler.rule.builder.PatternBuilder.rewriteCompositeExpressions(PatternBuilder.java:924)
        at org.drools.compiler.rule.builder.PatternBuilder.rewriteCompositeExpressions(PatternBuilder.java:919)
        at org.drools.compiler.rule.builder.PatternBuilder.rewriteOrExpressions(PatternBuilder.java:893)
        at org.drools.compiler.rule.builder.PatternBuilder.buildExpression(PatternBuilder.java:889)
        at org.drools.compiler.rule.builder.PatternBuilder.buildCcdDescr(PatternBuilder.java:860)
        at org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:715)
        at org.drools.compiler.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:580)
        at org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:182)
        at org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:146)
        at org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:127)
        at org.drools.compiler.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:63)
        at org.drools.compiler.rule.builder.RuleBuilder.build(RuleBuilder.java:97)
        at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addRule(KnowledgeBuilderImpl.java:1820)
        at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.compileRules(KnowledgeBuilderImpl.java:1111)
        at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.compileAllRules(KnowledgeBuilderImpl.java:989)
        at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildRules(CompositeKnowledgeBuilderImpl.java:257)
        at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackages(CompositeKnowledgeBuilderImpl.java:121)
        at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:105)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.buildKnowledgePackages(AbstractKieModule.java:241)
        at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:64)
        at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:230)
        at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:198)

I debugged the source code and found out that a rule similar to the following was causing the issue:

rule R when
    $p : Person( name == null || (name in ("Alice", "Charlie", "David"))==false )
then
     list.add($p.getName());
end

The same code and the same rule was working fine in BRMS 6.1.

Resolution

  • Rewrite the conditional element to use valid DRL syntax with not in instead:
    $p : Person( name == null || (name not in ("Alice", "Charlie", "David")) )
  • Upgrade to BRMS 6.2.2 patch release (once available)

Root Cause

The reported syntax is not a valid DRL syntax. The only accepted syntaxes are

x in ("foo", "bar") 
x not in ("foo", "bar")

The RuntimeException, however, is a bug in the BRMS 6.2.0 codebase1. The fix for this issue is planned to be included in BRMS 6.2.2 patch release.

  1. https://bugzilla.redhat.com/show_bug.cgi?id=1300692 ↩

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