[ 
http://issues.apache.org/jira/browse/JEXL-17?page=comments#action_12426016 ] 
            
Rahul Akolkar commented on JEXL-17:
-----------------------------------

Can you supply a test case (just the expression String should do) where this 
happens? Usually, I see oacj.parser.ParseException if the expression is 
malformed. It would seem more appropriate to (re)use that here, if needed, 
rather than defining a new exception.


> ExpressionFactory.createNewExpression should throw an Exception in case of a 
> parsing error, not Error
> -----------------------------------------------------------------------------------------------------
>
>                 Key: JEXL-17
>                 URL: http://issues.apache.org/jira/browse/JEXL-17
>             Project: Commons JEXL
>          Issue Type: Improvement
>    Affects Versions: Nightly Builds
>            Reporter: Kohsuke Kawaguchi
>         Attachments: JEXL-17.diff
>
>
> When ExpressionFactory.createNewExpression(...) takes an syntactically 
> incorrect expression, JEXL throws TokenMgrError. However, typical callers 
> (such as Jelly) don't expect such syntax error to be a java.lang.Error, so it 
> fails to catch it.
> A typical outcome is therefore the thread to die completely, and even worse 
> the stack trace doesn't report neither what was the expression that was being 
> parsed, nor does it report any contextual information (again in case of 
> Jelly, that would be where in the jelly script this error happened.)
> This makes the error diagnosis unnecessarily hard. I believe the proper thing 
> to do is to wrap such an exception into java.lang.Exception or its sub-class, 
> allowing the caller to catch it.

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