[jboss-jira] [JBoss JIRA] (DROOLS-476) NPE when MVEL parses arithmetic expression

[Hassler Jean-Christian (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hassler Jean-Christian updated DROOLS-476:
------------------------------------------

    Summary: NPE when MVEL parses arithmetic expression  (was: NPE when parsing arithmetic expression)


> NPE when MVEL parses arithmetic expression
> ------------------------------------------
>
>                 Key: DROOLS-476
>                 URL: https://issues.jboss.org/browse/DROOLS-476
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 5.5.0.Final
>         Environment: sun JDK 1.6;
> Drools 5.5.0Final
>            Reporter: Hassler Jean-Christian
>            Assignee: Mark Proctor
>              Labels: mvel, parsing
>
> When user write computations with MVEL, mvel throw the error {color:red}[Error: not a statement, or badly formed structure] {color}at parsing time.
> If you add parenthesis, parsing is OK.
> The issue can be reproduced directly with the lastest MVEL version.
> As you can see in the test below, same expression with parenthesis is OK. Debugging into mvel engine shows that there some nullPointerException in the bad case.
> This issue was reproduced with the MVEL version embedded inside Drools 5.5.0Final and also with MVEL version 2.1.9.Final.
> {code:java}
> public class MvelTest {
>       public void test(){
>     	  
> 		String expressionThatDoesNotWork = "5 + 1/10 * (VAR - 5)"; // !!! mvel cannot parse this expression
> 		String expressionThatWorks = "5 + (1/10) * (VAR - 5)"; //with additionnal parenthesis it's OK
> 		
> 		Serializable parsingResultOK = MVEL.compileExpression(expressionThatWorks); //this works seamlessly 
> 		System.out.println(parsingResultOK); //=> (Literal<5> + (Literal<0.1> * (VAR - Literal<5>)))
> 		
> 		Serializable failedResult = MVEL.compileExpression(expressionThatDoesNotWork); // !!! this throws NullPointerException in MVEL engine
> 		
>       }
> }
> {code}



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