[rules-users] How to catch Exceptions when firing rules

[Yang Song]

Thanks a lot for the answer, Mark. But I don't think it makes sense.

Because in some scenarios, you cannot guarantee the consequence part of rule
is 100% correct -- there could be errors happening in run-time which are
hard to predict, especially when a complex action or logic will be executed
as the concequece.

There should at least be some mechanisms to tell whoever fires the rule that
there is something wrong during the rule firing process, then and he can do
something, e.g. create a new session. Also it should enable the rule
firer to catch these exceptions and do the clean up work silently -- instead
of leaving these things on the stderr even cannot be seen in the logs. This
will make the program depending on the JBoss Rules to be more robust.

What do you think? If JBoss Rules already has the ability to do this job,
can you please let me know?

Thanks again,
Yang


On 8/24/07, Mark Proctor <mproctor at codehaus.org> wrote:
>
> Once an exception is thrown on a conseuqence the current session is
> considered invalid. You'll need to add the try catch inside of the actual
> consequence.
>
> Mark
> Yang Song wrote:
>
>  Hi,
>
> Anyone knows how to catch the exception when firing the rules?
>
> I wrapped the session.fireAllRules() method using try...catch, however it
> doesn't work: when someone wrote bad code in the rule's action part, the
> Exception will be thrown and printed to the stderr, and this will make the
> rule engine stop working -- the try...catch outside doesn't help anything.
>
> If  the exception thrown from the rule's action part can be caught
> externally, the system can be protected from interrupting Exception.
>
> try {
>         _log.debug("Firing rules in : " + getName());
>
>         session.fireAllRules();
>
> } catch (Exception e) {
>         _log.info("Error when firing rules: ", e);
> }
>
> Thanks,
> Yang
>
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