Mario Fusco created DROOLS-180: ---------------------------------- Summary: NPE when trying to add the same resource twice Key: DROOLS-180 URL: https://issues.jboss.org/browse/DROOLS-180 Project: Drools Issue Type: Bug Security Level: Public (Everyone can see) Reporter: Mario Fusco Assignee: Mario Fusco Trying to add the same resource twice to the KnowledgeBuilder like in {code} String str = "rule R when\n" + " $s : String()\n" + "then\n" + "end\n"; KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add( ResourceFactory.newByteArrayResource( str.getBytes() ), ResourceType.DRL ); kbuilder.add( ResourceFactory.newByteArrayResource( str.getBytes() ), ResourceType.DRL ); {code} generates the following NullPointerException: {code} java.lang.NullPointerException at org.drools.compiler.compiler.PackageBuilder.validateUniqueRuleNames(PackageBuilder.java:1351) at org.drools.compiler.compiler.PackageBuilder.initPackageRegistry(PackageBuilder.java:947) at org.drools.compiler.compiler.PackageBuilder.addPackage(PackageBuilder.java:899) at org.drools.compiler.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:484) at org.drools.compiler.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:688) at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:51) at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:40) {code} -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira