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From "Dmitri Blinov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JEXL-210) The way to cancel script execution with an error
Date Wed, 03 Aug 2016 14:42:20 GMT
Dmitri Blinov created JEXL-210:
----------------------------------

             Summary: The way to cancel script execution with an error
                 Key: JEXL-210
                 URL: https://issues.apache.org/jira/browse/JEXL-210
             Project: Commons JEXL
          Issue Type: New Feature
    Affects Versions: 3.0
            Reporter: Dmitri Blinov
            Priority: Minor


I don't see a way now to cancel script execution with some kind of error. Unfortunately it's
not possible to just throw an exception from some method as this will rely on current settings
of context/engine *strictness* and *verboseness*. Using InterruptedException for this purpose
is not an option because I think it has special meaning of cancelling the current thread execution.
Yet the task I beleive is quite common - to inform the executing environment that the script
has encountered some unavoidable situation and can not continue. Just like *return* statement
but returning not a value but an error. 

For this purpose we can simply introduce some new type of exception, for example 
{code}
    public static class Error extends JexlException {
    ...
{code}
and by throwing it from any method the JexlEngine will terminate the current script execution
regardless of strictness/verboseness. May be this task even deserves to have a special operator,
for example 

{code}
raise 'Something has happended';
{code}



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