[jboss-jira] [JBoss JIRA] Created: (JBRULES-2932) Regression: NullPointerException in PatternBuilder.build()

[Laird Nelson (JIRA)]

Regression: NullPointerException in PatternBuilder.build()
----------------------------------------------------------

                 Key: JBRULES-2932
                 URL: https://issues.jboss.org/browse/JBRULES-2932
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-compiler (expert)
    Affects Versions: 5.2.0.M1
            Reporter: Laird Nelson
            Assignee: Mark Proctor


Actually using 5.2.0-SNAPSHOT as of today (March 24, 2011).

I get this:

{code}
Caused by: java.lang.NullPointerException
	at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:323)
	at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:268)
	at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:107)
	at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
	at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:39)
	at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
	at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:39)
	at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
	at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:80)
	at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1313)
	at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:664)
	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:310)
	at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:483)
	at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
	at org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:697)
	at org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:675)
	at org.drools.agent.impl.KnowledgeAgentImpl.incrementalBuildResources(KnowledgeAgentImpl.java:882)
	at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:644)
	at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:188)
	at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:170)
{code}

This is on a monstrous rules file that has compiled fine for months.

The line in question says this:

{code}
for ( Iterator<BaseDescr> it = result.getDescrs().iterator(); it.hasNext(); ) {
{code}

I have not yet fired up the debugger to see which rule is causing the problem.

>From reading other bug reports, it might be that getDescrs() returns null.

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