org.kie:kie-maven-plugin:7.43.0-SNAPSHOT:generateModel failed: sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl ---------------------------------------------------------------------------------------------------------------------------- Key: DROOLS-5590 URL: https://issues.redhat.com/browse/DROOLS-5590 Project: Drools Issue Type: Bug Components: executable model Affects Versions: 7.35.0.Final, 7.36.0.Final, 7.37.0.Final, 7.38.0.Final, 7.39.0.Final, 7.40.0.Final, 7.41.0.Final, 7.42.0.Final Reporter: Ciprian Chiru Assignee: Luca Molteni Priority: Major When compiling the rules, _org.kie:kie-maven-plugin::generateModel_ fails with _sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl_ Given the rule below: {code:java} import java.util.Map; import java.util.List; global java.util.Set controlSet; rule "will execute per each Measurement having ID color" no-loop when $measurement: Measurement( id == "color", $colorVal : val ) $lst : List() from collect(Measurement()) $selectedList: List() from accumulate(Measurement($m: this) from $lst, collectList(Map.entry($m, $measurement.getListOfCodes()))) then controlSet.add($colorVal); end{code} Fails with the following stack exception: {code:java} Caused by: java.lang.ArrayStoreException: sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl at java.util.stream.Nodes$FixedNodeBuilder.accept (Nodes.java:1230) at java.util.stream.ReferencePipeline$3$1.accept (ReferencePipeline.java:195) at java.util.ArrayList$ArrayListSpliterator.forEachRemaining (ArrayList.java:1654) at java.util.stream.AbstractPipeline.copyInto (AbstractPipeline.java:484) at java.util.stream.AbstractPipeline.wrapAndCopyInto (AbstractPipeline.java:474) at java.util.stream.AbstractPipeline.evaluate (AbstractPipeline.java:550) at java.util.stream.AbstractPipeline.evaluateToArrayNode (AbstractPipeline.java:260) at java.util.stream.ReferencePipeline.toArray (ReferencePipeline.java:517) at org.drools.modelcompiler.builder.generator.DrlxParseUtil.returnTypeOfMethodCallExpr (DrlxParseUtil.java:186) at org.drools.modelcompiler.builder.generator.ToMethodCall.setCursorForMethodCall (ToMethodCall.java:128) at org.drools.modelcompiler.builder.generator.ToMethodCall.toMethodCallWithClassCheck (ToMethodCall.java:71) at org.drools.modelcompiler.builder.generator.visitor.accumulate.AccumulateVisitor.methodCallExprParameter (AccumulateVisitor.java:262) at org.drools.modelcompiler.builder.generator.visitor.accumulate.AccumulateVisitor.parseFirstParameter (AccumulateVisitor.java:206) at org.drools.modelcompiler.builder.generator.visitor.accumulate.AccumulateVisitor.visit (AccumulateVisitor.java:186) at org.drools.modelcompiler.builder.generator.visitor.accumulate.AccumulateVisitor.classicAccumulate (AccumulateVisitor.java:145) at org.drools.modelcompiler.builder.generator.visitor.accumulate.AccumulateVisitor.visit (AccumulateVisitor.java:128) at org.drools.modelcompiler.builder.generator.visitor.ModelGeneratorVisitor.visit (ModelGeneratorVisitor.java:139) at org.drools.compiler.lang.descr.PatternDescr.accept (PatternDescr.java:288) at org.drools.modelcompiler.builder.generator.visitor.AndVisitor.visit (AndVisitor.java:50) at org.drools.modelcompiler.builder.generator.visitor.ModelGeneratorVisitor.visit (ModelGeneratorVisitor.java:86) at org.drools.modelcompiler.builder.generator.ModelGenerator.processRule (ModelGenerator.java:186) at org.drools.modelcompiler.builder.generator.ModelGenerator.generateModel (ModelGenerator.java:159) at org.drools.modelcompiler.builder.ModelBuilderImpl.compileKnowledgePackages (ModelBuilderImpl.java:281) at org.drools.modelcompiler.builder.ModelBuilderImpl.buildRules (ModelBuilderImpl.java:209) at org.drools.modelcompiler.builder.ModelBuilderImpl.postBuild (ModelBuilderImpl.java:129) at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build (CompositeKnowledgeBuilderImpl.java:111) at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build (CompositeKnowledgeBuilderImpl.java:97) at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages (AbstractKieProject.java:268) at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages (AbstractKieProject.java:216) at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify (AbstractKieProject.java:80) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject (KieBuilderImpl.java:279) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll (KieBuilderImpl.java:247) at org.kie.maven.plugin.GenerateModelMojo.generateModel (GenerateModelMojo.java:146) at org.kie.maven.plugin.GenerateModelMojo.execute (GenerateModelMojo.java:106) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137){code}   As the title says, this error happens on the _7.43.0-SNAPSHOT_ version as well.