[jboss-jira] [JBoss JIRA] (DROOLS-476) NPE when parsing arithmetic expression
Hassler Jean-Christian created DROOLS-476:
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Summary: NPE when parsing 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
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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