[jboss-jira] [JBoss JIRA] Updated: (JBRULES-2527) NullPointerException during rule compilation on entry.getValue().getExtractor().getExtractToClass() instead of clear, understandable compiler error because the getter doesn't exist
Geoffrey De Smet (JIRA)
jira-events at lists.jboss.org
Sun May 30 08:06:08 EDT 2010
[ https://jira.jboss.org/browse/JBRULES-2527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Geoffrey De Smet updated JBRULES-2527:
--------------------------------------
Summary: NullPointerException during rule compilation on entry.getValue().getExtractor().getExtractToClass() instead of clear, understandable compiler error because the getter doesn't exist (was: NullPointerException during rule compilation on entry.getValue().getExtractor().getExtractToClass() instead of clear, understandable compiler error)
Description:
When adding this rule, I got a NullPointerException:
rule "myRule"
when
MyFact(
...
$myVariable : wrongGetterName
)
...
end
It crashes in
PatternBuilder.getDeclarationsMap(PatternBuilder.java:666) (With that line number it must be evil! :))
on this line:
declarations.put( entry.getKey(),
entry.getValue().getExtractor().getExtractToClass() );
and in debug it shows that
entry.getValue() is $myVariable
and that
entry.getValue().getExtractor() is null
which makes .getExtractToClass() give the NPE
It turns out that MyFact.getWrongGetterName() doesn't exist (it should be MyFact.getCorrectGetterName()).
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)
was:
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)
> NullPointerException during rule compilation on entry.getValue().getExtractor().getExtractToClass() instead of clear, understandable compiler error because the getter doesn't exist
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> 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 "myRule"
> when
> MyFact(
> ...
> $myVariable : wrongGetterName
> )
> ...
> end
> It crashes in
> PatternBuilder.getDeclarationsMap(PatternBuilder.java:666) (With that line number it must be evil! :))
> on this line:
> declarations.put( entry.getKey(),
> entry.getValue().getExtractor().getExtractToClass() );
> and in debug it shows that
> entry.getValue() is $myVariable
> and that
> entry.getValue().getExtractor() is null
> which makes .getExtractToClass() give the NPE
> It turns out that MyFact.getWrongGetterName() doesn't exist (it should be MyFact.getCorrectGetterName()).
> 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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