NoSuchElementException on addKnowledgePackages when a "not" follows an "eval" ----------------------------------------------------------------------------- Key: DROOLS-387 URL: https://issues.jboss.org/browse/DROOLS-387 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 5.5.0.Final Environment: java version "1.7.0_21" Reporter: Jason Saint Assignee: Mark Proctor I apologize if this has already been reported, but I did not see anything in search results for which this looked like a duplicate. With the following 2 rules, compiling the first and adding it to a knowledge base causes subsequent package additions to fail with a NoSuchElementException. rule "Problem" when eval(true == true) not String() from "Problem" then end rule "Test1" when $test : String() from "Test" then end The following java code will produce the exception on the second call to addKnowledgePackages (tried with Drools 5.4 and 5.5) {code} package com.chiprewards.droolsbug; import org.drools.KnowledgeBase; import org.drools.KnowledgeBaseFactory; import org.drools.builder.KnowledgeBuilder; import org.drools.builder.KnowledgeBuilderErrors; import org.drools.builder.KnowledgeBuilderFactory; import org.drools.io.Resource; import org.drools.builder.ResourceType; import org.drools.io.ResourceFactory; /** * Hello world! * */ public class App { public static void main( String[] args ) { KnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase(); KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); String problem_rule = "rule \"Problem\"\n when\n eval(true == true)\n not String() from \"Problem\"\n then\nend"; Resource resource = ResourceFactory.newByteArrayResource(problem_rule.getBytes()); kbuilder.add(resource, ResourceType.DRL); if(kbuilder.hasErrors()) { System.out.println("First rule had error parsing"); System.exit(1); } kBase.addKnowledgePackages(kbuilder.getKnowledgePackages()); //Add second rule String next_rule = "rule \"Test\"\n when\n String() from \"Test\"\n then\nend"; resource = ResourceFactory.newByteArrayResource(next_rule.getBytes()); kbuilder.add(resource, ResourceType.DRL); if(kbuilder.hasErrors()) { System.out.println("Second rule had error parsing"); System.exit(1); } kBase.addKnowledgePackages(kbuilder.getKnowledgePackages()); } } {code}