[rules-dev] [JBoss JIRA] (JBRULES-3134) Parenthesized class name causes NPE in RuleBuilder (MVEL)

[Wolfgang Laun]

Nice going, Mario, like a hot knife through butter ;-)
Wolfgang

On 7 October 2011 20:38, Mario Fusco (Commented) (JIRA)
<jira-events at lists.jboss.org> wrote:
>
>    [ https://issues.jboss.org/browse/JBRULES-3134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633213#comment-12633213 ]
>
> 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
>
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