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

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 Fix For: 5.2.0.M2 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.