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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Yang,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you want to evaluate the remaining rules in the transaction
you will need to catch and handle your errors rather than throw them to the
engine. This is consistent with other products, such as ILog
JRules. If you are catching and handling your own errors, you can
always grab the rule number and exception and add them to your reply. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><img width=132 height=23 id="Picture_x0020_1"
src="cid:image003.jpg@01C7E645.02B09F90" alt=railinc><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>____________________________________________________<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Barry Knapp<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><a href="mailto:Barry.Knapp@RailInc.com">Barry.Knapp@RailInc.com</a><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>919.651.5039<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>MSN Messenger <a href="mailto:barry25@hotmail.com">barry25@hotmail.com</a>
<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <b>On Behalf Of </b>Yang Song<br>
<b>Sent:</b> Friday, August 24, 2007 11:16 AM<br>
<b>To:</b> Rules Users List<br>
<b>Subject:</b> Re: [rules-users] How to catch Exceptions when firing rules<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>Thanks a lot for the answer, Mark. But I don't think it
makes sense. <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>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. <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>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. <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>What do you think? If JBoss Rules already has the ability to
do this job, can you please let me know?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Thanks again,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Yang<br>
<br>
<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span class=gmailquote>On 8/24/07, <b>Mark Proctor</b> <<a
href="mailto:mproctor@codehaus.org">mproctor@codehaus.org</a>> wrote:</span>
<o:p></o:p></p>
<div>
<p class=MsoNormal>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.<br>
<br>
Mark<br>
Yang Song wrote: <o:p></o:p></p>
<div>
<div>
<p class=MsoNormal>Hi, <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Anyone knows how to catch the exception when firing the
rules? <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>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. <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>If the exception thrown from the rule's
action part can be caught externally, the system can be protected
from interrupting Exception.<o:p></o:p></p>
</div>
<div>
<p><span style='font-family:"Courier New";color:#3333FF;background:white'>try {<br>
_log.debug("Firing rules in :
" + getName());</span><o:p></o:p></p>
<p><span style='font-family:"Courier New";color:#3333FF;background:white'>
session.fireAllRules();</span><o:p></o:p></p>
<p><span style='font-family:"Courier New";color:#3333FF;background:white'>}
catch (Exception e) {<br>
_log.info("Error when firing
rules: ", e);<br>
}</span> <o:p></o:p></p>
<p>Thanks, <br>
Yang<o:p></o:p></p>
</div>
</div>
<pre style='text-align:center'>
<hr size=4 width="90%" align=center>
</pre><pre><o:p> </o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>rules-users mailing list<o:p></o:p></pre><pre><a
href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a><o:p></o:p></pre><pre><a
href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a><o:p></o:p></pre><pre> <o:p></o:p></pre>
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<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
_______________________________________________<br>
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