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