[jboss-jira] [JBoss JIRA] Created: (JBRULES-3134) Parenthesized class name causes NPE in RuleBuilder (MVEL)

[Wolfgang Laun (JIRA)]

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: Mark Proctor
             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


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