[jboss-jira] [JBoss JIRA] Created: (JBRULES-2527) NullPointerException during rule compilation on entry.getValue().getExtractor().getExtractToClass() instead of clear, understandable compiler error

[Geoffrey De Smet (JIRA)]

NullPointerException during rule compilation on entry.getValue().getExtractor().getExtractToClass() instead of clear, understandable compiler error
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                 Key: JBRULES-2527
                 URL: https://jira.jboss.org/browse/JBRULES-2527
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-compiler (expert)
    Affects Versions: 5.1.0.M2
            Reporter: Geoffrey De Smet
            Assignee: Edson Tirelli
            Priority: Minor
             Fix For: FUTURE


When adding this rule, I got a NullPointerException:

rule "unwantedPatternShiftType2DaysPattern"
    when
        $pattern : ShiftType2DaysPattern(
            $startDayOfWeek : startDayOfWeek,
            $dayIndex0shiftType : dayIndex0shiftType,
            $dayIndex1shiftType : dayIndex1shiftType
        )
        PatternContractLine(
            pattern == $pattern, $contract : contract
        )

        Assignment(
            eval(null == $dayIndex0shiftType) || (shiftType == $dayIndex0shiftType),
            contract == $contract, shiftDateDayOfWeek == $startDayOfWeek,
            $employee : employee, $firstDayIndex : shiftDateDayIndex
        )
        Assignment(
            eval(null == $dayIndex1shiftType) || (shiftType == $dayIndex1shiftType),
            employee == $employee,
            shiftDateDayIndex == ($firstDayIndex + 1)
        )
    then
        insertLogical(new IntConstraintOccurrence("unwantedPattern", ConstraintType.NEGATIVE_SOFT,
                $pattern.getWeight(),
                $employee, $pattern, $firstDayIndex));
end


It crashes on this line:
declarations.put( entry.getKey(),
                              entry.getValue().getExtractor().getExtractToClass() );
and in debug it shows that
  entry.getValue() is $dayIndex1shiftType
and that
  entry.getValue().getExtractor() is null
which makes .getExtractToClass() give the NPE


Exception in thread "main" java.lang.NullPointerException
	at org.drools.rule.builder.PatternBuilder.getDeclarationsMap(PatternBuilder.java:666)
	at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:599)
	at org.drools.rule.builder.PatternBuilder.buildConstraint(PatternBuilder.java:269)
	at org.drools.rule.builder.PatternBuilder.buildConstraint(PatternBuilder.java:294)
	at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:213)
	at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:108)
	at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:69)
	at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:79)
	at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1142)
	at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:628)
	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:252)
	at org.drools.planner.config.localsearch.LocalSearchSolverConfig.buildRuleBase(LocalSearchSolverConfig.java:193)
	at org.drools.planner.config.localsearch.LocalSearchSolverConfig.buildSolver(LocalSearchSolverConfig.java:170)
	at org.drools.planner.config.XmlSolverConfigurer.buildSolver(XmlSolverConfigurer.java:77)
	at org.drools.planner.examples.nurserostering.app.NurseRosteringApp.createSolver(NurseRosteringApp.java:31)
	at org.drools.planner.examples.common.app.CommonApp.createSolutionBusiness(CommonApp.java:43)
	at org.drools.planner.examples.common.app.CommonApp.<init>(CommonApp.java:22)
	at org.drools.planner.examples.nurserostering.app.NurseRosteringApp.<init>(NurseRosteringApp.java:18)
	at org.drools.planner.examples.nurserostering.app.NurseRosteringApp.main(NurseRosteringApp.java:24)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:110)

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