[jira] Issue Comment Edited: (JEXL-104) NPE in JexlArithmetic when an Array-Expression containing a null is used.

["Andreas Haufler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JEXL-104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897201#action_12897201 ] 

Andreas Haufler edited comment on JEXL-104 at 8/11/10 6:08 AM:
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The first file (JexlArithmeticBug.java) shows the bug. The second file (FixedJexlArithmetic.java) is a suggested fix, BUT it is just a give re-write of the original code. I'm not too deep into reflection with arrays and all that so the original author might want to take a look at it and might apply a better fix.

      was (Author: aha@scireum.de):
    First file shows the bug. The second file is a suggested fix, BUT it is just a give re-write of the original code. I'm not too deep into reflection with arrays and all that so the original author might want to take a look at it and might apply a better fix.
  
> NPE in JexlArithmetic when an Array-Expression containing a null is used.
> -------------------------------------------------------------------------
>
>                 Key: JEXL-104
>                 URL: https://issues.apache.org/jira/browse/JEXL-104
>             Project: Commons JEXL
>          Issue Type: Bug
>    Affects Versions: 2.0.1
>            Reporter: Andreas Haufler
>         Attachments: FixedJexlArithmetic.java, JexlArithmeticBug.java
>
>
> When using the Array-Expression like [x, y, z] a NPE occurs when one of the array elements is null.
> Example:
> import org.apache.commons.jexl2.Expression;
> import org.apache.commons.jexl2.JexlEngine;
> import org.apache.commons.jexl2.MapContext;
> public class JexlArithmeticBug {
> 	public static void main(String[] args) {
> 		JexlEngine engine = new JexlEngine();
> 		String jexlExp = "[null, null]";
> 		Expression e = engine.createExpression(jexlExp);
> 		System.out.println(e.evaluate(new MapContext()));
> 	}
> }
> As one can see in the Stacktrace, JexlArithmetic.narrowArrayType doesn't expect null values at all.

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