[jboss-jira] [JBoss JIRA] Created: (JBRULES-3130) Regression. Rule misfires due to constraint list[0].field1/2 in two rules

[Wolfgang Laun (JIRA)]

Regression. Rule misfires due to constraint list[0].field1/2 in two rules
-------------------------------------------------------------------------

                 Key: JBRULES-3130
                 URL: https://issues.jboss.org/browse/JBRULES-3130
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 5.2.0.Final
            Reporter: Wolfgang Laun
            Assignee: Mark Proctor
            Priority: Critical
             Fix For: 5.2.1.Final


A pair of constraints suich as list[0].a == null and list[0].b == null in two different rules causes one of the rules not to fire and the other one to fire erroneously (see results at the end).

Java:
================================================================
public class Three {
    private String a;
    private String b;
    private String c;
    public Three( String a, String b, String c ){
	this.a = a;
	this.b = b;
	this.c = c;
    }
    public String getA(){ return a; }
    public String getB(){ return b; }
    public String getC(){ return c; }
}
================================================================
import java.util.*;
public class ListOfThree {
    private List<Three> list;
    private Class<?> clazz;
    public ListOfThree( Three three, Class<?> clazz ){
	list = new ArrayList<Three>();
	list.add( three );
        this.clazz = clazz;
    }
    public List<Three> getList(){ return list; }
    public Class<?> getClazz(){	return clazz; }
}
================================================================
// Insertion of facts
        Three three = new Three( "a", "b", "c" );
        ListOfThree listof3 = new ListOfThree( three, java.lang.Object.class );
        kSession.insert( listof3 );
        three = new Three( "x", null, "z" );
        listof3 = new ListOfThree( three, java.lang.String.class );
        kSession.insert( listof3 );
        three = new Three( null, "q", "r" );
        listof3 = new ListOfThree( three, java.lang.Integer.class );
        kSession.insert( listof3 );
===================================================================
rule 'rule1'
############################  dialect "mvel"   ## does not matter
when
    ListOfThree( list[0].a == null, $c: clazz );
then
    System.out.println( "rule1 " + $c.getSimpleName() );
end

rule 'rule2'
############################  dialect "mvel"   ## does not matter
when
    ListOfThree( list[0].b == null, $c: clazz  );
then
    System.out.println( "rule2 " + $c.getSimpleName() );
end
=================================================================
Results:
rule2 Integer
rule1 Integer



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