[jboss-jira] [JBoss JIRA] (DROOLS-387) NoSuchElementException on addKnowledgePackages when a "not" follows an "eval"

[Jason Saint (JIRA)]

Jason Saint created DROOLS-387:
----------------------------------

             Summary: 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 (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}

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