@Wolfgang: if you are using <meta http-equiv="content-type" content="text/html; charset=utf-8"><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(0, 0, 255); font-family: Consolas, &#39;Bitstream Vera Sans Mono&#39;, &#39;Courier New&#39;, Courier, monospace; font-size: 11px; line-height: 14px; ">drools.agent.newInstance=true </span>(the default configuration), then whenever a change-set is applied, either because you explicitly force the agent to  do so, or because a monitored resource changes, the kbase inside the agent is thrown away an a new kbase is created. So you need to get the kbase from the agent and retrieve a fresh session from it.<div>

You can confirm this behavior in this set of tests: <meta http-equiv="content-type" content="text/html; charset=utf-8"><span class="Apple-style-span" style="border-collapse: collapse; font-family: arial, sans-serif; font-size: 13px; "><a href="https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test/java/org/drools/agent/KnowledgeAgentIncrementalChangeSetTest.java" target="_blank" style="color: rgb(7, 77, 143); ">https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test/java/org/drools/agent/KnowledgeAgentIncrementalChangeSetTest.java</a>  <br>

</span><div>But, if you are using <meta http-equiv="content-type" content="text/html; charset=utf-8"><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(0, 0, 255); font-family: Consolas, &#39;Bitstream Vera Sans Mono&#39;, &#39;Courier New&#39;, Courier, monospace; font-size: 11px; line-height: 14px; ">drools.agent.newInstance=false </span>the internal kbase (and each stateful session you got from it) is refreshed when a change-set is applied.<br>

<br></div><div>@maav: could you please post the output log? When you say &quot;it doesn&#39;t work&quot; are you saying that it fails when the agent tries to apply the change-set for the first time? Or it fails if you modify the package when the agent is running?</div>

<div><br></div><div>Best Regards,</div><div>    <br>XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX<br><br>Esteban Aliverti<br>- Developer @ <a href="http://www.plugtree.com" target="_blank">http://www.plugtree.com </a><br>- Blog @ <a href="http://ilesteban.wordpress.com" target="_blank">http://ilesteban.wordpress.com</a><br>


<br><br><div class="gmail_quote">On Wed, Apr 20, 2011 at 11:08 AM, maav <span dir="ltr">&lt;<a href="mailto:mattias.avelin@netlight.se">mattias.avelin@netlight.se</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

...I forgot the mention that I&#39;ve made sure that all files are on the<br>
classpath. If I go directly for the drl file without using KnowledgeAgent<br>
and ChangeSet.xml it works.<br>
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