Amit Nijhawan created DROOLS-5934: ------------------------------------- Summary: NullPointerException at ConstraintEvaluator.findPatternAndRequiredDeclaration() in accumulate with exec-model Key: DROOLS-5934 URL: https://issues.redhat.com/browse/DROOLS-5934 Project: Drools Issue Type: Bug Components: executable model Affects Versions: 7.48.0.Final Reporter: Amit Nijhawan Assignee: Toshiya Kobayashi With exec-model, a rule like this: {noformat} when Number( ) from accumulate ( FactA( $valueA : value ) and FactB( $valueB : value, eval($valueB.compareTo($valueA) <= 0) ) ;max($valueB.intValue()) ) then {noformat} generates the following PATTERN_DSL: {code:java} org.drools.model.Rule rule = D.rule("org.drools.mvel.compiler", "r1").build(D.pattern(var_GENERATED_$pattern_Number$1$), D.accumulate(D.and(D.pattern(var_GENERATED_$pattern_FactA$2$).bind(var_$valueA, org.drools.mvel.compiler.P46.LambdaExtractor468EFEB3BE9EA6494C88709DE97051CB.INSTANCE, D.reactOn("value")), D.pattern(var_GENERATED_$pattern_FactB$3$).bind(var_6C0A578A2EA3D5A5C82ABB0FA0DE5C71, org.drools.mvel.compiler.P18.LambdaExtractor18D900ABC004631DF004CDA316CD34FD.INSTANCE, D.reactOn("value")).expr("A574527869CA97E0B100815026E8E8FA", var_$valueB, var_$valueA, org.drools.mvel.compiler.P3E.LambdaPredicate3E396A3A5FB9CCA4FC041866C27E4A3A.INSTANCE)), D.accFunction(org.drools.core.base.accumulators.IntegerMaxAccumulateFunction::new, var_6C0A578A2EA3D5A5C82ABB0FA0DE5C71).as(var_GENERATED_$pattern_Number$1$)), D.execute(org.drools.mvel.compiler.P97.LambdaConsequence97C360F7B2C85569E6224ABDE862C784.INSTANCE)); {code} It misses bind() for var_$valueB. It results in NPE during kbase build. {noformat} java.lang.NullPointerException at org.drools.modelcompiler.constraints.ConstraintEvaluator.findPatternAndRequiredDeclaration(ConstraintEvaluator.java:97) at org.drools.modelcompiler.constraints.ConstraintEvaluator.<init>(ConstraintEvaluator.java:67) at org.drools.modelcompiler.KiePackagesBuilder.createSingleConstraint(KiePackagesBuilder.java:1064) at org.drools.modelcompiler.KiePackagesBuilder.createConstraint(KiePackagesBuilder.java:1049) at org.drools.modelcompiler.KiePackagesBuilder.addConstraintsToPattern(KiePackagesBuilder.java:1043) at org.drools.modelcompiler.KiePackagesBuilder.buildPattern(KiePackagesBuilder.java:730) at org.drools.modelcompiler.KiePackagesBuilder.recursivelyAddConditions(KiePackagesBuilder.java:624) at org.drools.modelcompiler.KiePackagesBuilder.buildAccumulate(KiePackagesBuilder.java:581) at org.drools.modelcompiler.KiePackagesBuilder.conditionToElement(KiePackagesBuilder.java:493) at org.drools.modelcompiler.KiePackagesBuilder.addSubConditions(KiePackagesBuilder.java:655) at org.drools.modelcompiler.KiePackagesBuilder.populateLHS(KiePackagesBuilder.java:449) at org.drools.modelcompiler.KiePackagesBuilder.compileRule(KiePackagesBuilder.java:249) at org.drools.modelcompiler.KiePackagesBuilder.build(KiePackagesBuilder.java:220) at org.drools.modelcompiler.CanonicalKieModule.createKiePackages(CanonicalKieModule.java:306) at org.drools.modelcompiler.CanonicalKieModule.lambda$1(CanonicalKieModule.java:213) at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) at org.drools.modelcompiler.CanonicalKieModule.createKieBase(CanonicalKieModule.java:213) at org.drools.compiler.kie.builder.impl.KieContainerImpl.createKieBase(KieContainerImpl.java:470) {noformat} ==== Even this rule causes the issue. So the key factor is the method invocation $valueB.intValue() {noformat} when Number( ) from accumulate ( FactB( $valueB : value, $valueB > 0 ) ;max($valueB.intValue()) ) then {noformat} -- This message was sent by Atlassian Jira (v8.13.1#813001)