[ https://issues.jboss.org/browse/JBRULES-3134?page=com.atlassian.jira.plug... ] Mario Fusco commented on JBRULES-3134: -------------------------------------- This is a MVEL bug that should be fixed with this pull request: https://github.com/mvel/mvel/pull/23 > Parenthesized class name causes NPE in RuleBuilder (MVEL) > --------------------------------------------------------- > >                 Key: JBRULES-3134 >                 URL: https://issues.jboss.org/browse/JBRULES-3134 >             Project: Drools >          Issue Type: Bug >      Security Level: Public(Everyone can see) >    Affects Versions: 5.2.0.Final >            Reporter: Wolfgang Laun >            Assignee: Mario Fusco >             Fix For: 5.2.1.Final > > > declare Foo >   clazz : Class > end > rule testFoo > when >     Foo( clazz == (java.lang.Object)  ) > then >     System.out.println( "Foo is Object" ); > end > causes > Exception in thread "main" [Error: not a statement, or badly formed structure] > [Near : {... (java.lang.Object) ....}] >                                ^ > [Line: 1, Column: 19] >       at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:307) >       at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:69) >       at org.mvel2.MVEL.analysisCompile(MVEL.java:668) >       at org.mvel2.MVEL.analysisCompile(MVEL.java:672) >       at org.drools.rule.builder.PatternBuilder.setInputs(PatternBuilder.java:779) >       at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:540) >       at org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:349) >       at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:264) >       at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:122) >       at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65) >       at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:81) >       at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1889) >       at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:755) >       at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:365) >       at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:543) >       at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28) >       at listofthree.Main.setup(Main.java:55) >       at listofthree.Main.main(Main.java:107) > Caused by: java.lang.NullPointerException >       at java.lang.Class.isAssignableFrom(Native Method) >       at org.mvel2.DataConversion.canConvert(DataConversion.java:104) >       at org.mvel2.ast.TypeCast.<init>(TypeCast.java:47) >       at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:1034) >       at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:135) >       ... 17 more -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.jboss.org/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira