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From "Henri Biestro (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JEXL-42) NullPointerException evaluating an expression
Date Fri, 17 Jul 2009 15:00:15 GMT

    [ https://issues.apache.org/jira/browse/JEXL-42?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732564#action_12732564
] 

Henri Biestro commented on JEXL-42:
-----------------------------------

Undefined variable handling & detection fixed in 2.0.

> NullPointerException evaluating an expression
> ---------------------------------------------
>
>                 Key: JEXL-42
>                 URL: https://issues.apache.org/jira/browse/JEXL-42
>             Project: Commons JEXL
>          Issue Type: Bug
>    Affects Versions: 1.1
>            Reporter: Alejandro Torras
>
> Hi all,
> Testing randomly to find a way to have nested evaluations I got an error with the following
code:
> 	<j:set var="ax" value="ok" />
> 	${ax+(bx)}
> And the error:
> Dec 18, 2007 1:55:52 AM org.apache.commons.jelly.expression.jexl.JexlExpression evaluate
> WARNING: Caught exception evaluating: ax+(bx). Reason: java.lang.NullPointerException
> java.lang.NullPointerException
>         at org.apache.commons.jexl.parser.ASTAddNode.value(ASTAddNode.java:116)
>         at org.apache.commons.jexl.parser.ASTExpression.value(ASTExpression.java:53)
>         at org.apache.commons.jexl.parser.ASTExpressionExpression.value(ASTExpressionExpression.java:55)
>         at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:79)
>         at org.apache.commons.jelly.expression.jexl.JexlExpression.evaluate(JexlExpression.java:69)
>         at org.apache.commons.jelly.impl.ExpressionScript.run(ExpressionScript.java:66)
>         at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
>         at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
>         at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
>         at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
>         at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:247)
>         at org.apache.commons.jelly.util.CommandLineParser.invokeCommandLineJelly(CommandLineParser.java:130)
>         at org.apache.commons.jelly.Jelly.main(Jelly.java:92)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at com.werken.forehead.Forehead.run(Forehead.java:551)
>         at com.werken.forehead.Forehead.main(Forehead.java:581)
> Obviously "bx" is not defined.
> Regards,
> Alejandro Torras.

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