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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">If you want to stop execution you can do
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">kcontext.getKnowledgeRuntime().halt();<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">However this will only get executed once all the rules have been evaluated so it can’t be used to prevent null pointer exceptions in condtions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Another approach which may (or may not) work is to get your condition to actually throw an exception if the condition doesn’t match this will normally stop
 the execution as well.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Eg<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">function isNull(Object o)
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if(o == null) throw new ValidationException(“Object is null&nbsp; :(“);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:36.0pt"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">return false;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">end<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">rule “blagh”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">when</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eval(isNull(someObject))<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">then</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //this will never be reached as an exception will be thrown<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">End<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">(you may need to fiddle with syntax and use a java method or something.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">The other key thing to remember though is if you have structured your rules correctly (null check as the very first condition) then all 100 rules will share the same null
 check node and you will only be doing it once not 100 times anyway and so it will make little difference on performance. (And a null check is very fast anyway). Don’t optimize until you know you actually have to – there are likely to be other far more important
 performance issues in your application anyway<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">Thomas</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>Sathya Prakash<br>
<b>Sent:</b> 16 February 2011 22:51<br>
<b>To:</b> Mauricio Salatino; michael.anstis@gmail.com<br>
<b>Cc:</b> Rules Users List<br>
<b>Subject:</b> Re: [rules-users] how to stop rule execution<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">I got great Idea by this discussion.<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">If there is no way of stopping rules then I can do this null condition check before executing rules. Adding one action in JBoss&nbsp;ESB will solve problem.<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">Please suggest me.<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">Many Thanks in advance.<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Sathya Prakash.<o:p></o:p></p>
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<p class="MsoNormal">On Thu, Feb 17, 2011 at 2:39 AM, Sathya Prakash &lt;<a href="mailto:prakashagarval@gmail.com">prakashagarval@gmail.com</a>&gt; wrote:<o:p></o:p></p>
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<p class="MsoNormal">Thanks for your suggestion..<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">But let us assume i have 100 rules based on single response. When response is null then if i am doing null check in all rules then it degrades the performance. &nbsp;My application hits are &nbsp;million per day. if 1 % percent fails think about
 the impact.<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal"><b>Regards,</b><o:p></o:p></p>
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<p class="MsoNormal"><b>Sathya Prakash.</b><o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">On Thu, Feb 17, 2011 at 2:26 AM, Mauricio Salatino &lt;<a href="mailto:salaboy@gmail.com" target="_blank">salaboy@gmail.com</a>&gt; wrote:<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">you can do something like:<span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">rule &quot;Error Check&quot;<br>
salience 100<br>
<br>
when</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">error condition check</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">then</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">System.Out.Println(&quot;Response has errors&quot;);</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">XXXXXXXXXXXXXXXXXXXXXXXX to exit from rule execution<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">insert(Stop())</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">end</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;"><br>
<br>
rule &quot;Rule-01&quot;<br>
salience 99<br>
when<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">not(Stop())</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">repsonse.getxx()</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">then&nbsp;</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">end.</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">2011/2/16 Sathya Prakash &lt;<a href="mailto:prakashagarval@gmail.com" target="_blank">prakashagarval@gmail.com</a>&gt;<o:p></o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">How to stop rule execution in &nbsp;technical rule,&nbsp;<o:p></o:p></p>
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<p class="MsoNormal">Example&nbsp;<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">rule &quot;Error Check&quot;<br>
salience 100<br>
<br>
when</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">error condition check</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">then</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">System.Out.Println(&quot;Response has errors&quot;);</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">XXXXXXXXXXXXXXXXXXXXXXXX to exit from rule execution</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">end</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;"><br>
<br>
rule &quot;Rule-01&quot;<br>
salience 99<br>
when</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">repsonse.getxx()</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">then&nbsp;</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">end.</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">if first rule then part executed means the response is error hence we should not execute second.</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">Is there any way to exit rule execution.</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">Regards,</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;">Sathya Prakash.</span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
</div>
</div>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>
rules-users mailing list<br>
<a href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a><br>
<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></p>
</div>
<p class="MsoNormal"><span style="color:#888888"><br>
<br clear="all">
<br>
-- <br>
&nbsp;- CTO @ <a href="http://www.plugtree.com" target="_blank">http://www.plugtree.com</a>&nbsp;
<br>
&nbsp;- MyJourney @ <a href="http://salaboy.wordpress.com" target="_blank">http://salaboy.wordpress.com</a><br>
&nbsp;- Co-Founder @ <a href="http://www.jbug.com.ar" target="_blank">http://www.jbug.com.ar</a><br>
&nbsp;<br>
&nbsp;- Salatino &quot;Salaboy&quot; Mauricio -</span><o:p></o:p></p>
</div>
<p class="MsoNormal"><br>
<br clear="all">
<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
<p class="MsoNormal">Cheers,<br>
Sathya Prakash.<br>
<b><span style="font-family:Gautami;background:#6633FF">సత్య</span><span style="background:#6633FF">
</span></b><b><span style="font-family:Gautami;background:#6633FF">ప్రకాష్</span></b>.<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<p class="MsoNormal"><br>
<br clear="all">
<br>
-- <o:p></o:p></p>
<div>
<p class="MsoNormal">Cheers,<br>
Sathya Prakash.<br>
<b><span style="font-family:Gautami;background:#6633FF">సత్య</span><span style="background:#6633FF">
</span></b><b><span style="font-family:Gautami;background:#6633FF">ప్రకాష్</span></b>.<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</div>
</div>
<br>
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