[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

[ https://jira.jboss.org/browse/JBRULES-2527?page=com.atlassian.jira.plugin... ] 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) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira