<div><br></div> Wolfgang, <div><br></div><div> The requirement for serializable classes even when not using persistence was a "mistake" made several versions ago and I believed it was fixed. What version of Drools are you using? If that is trunk, we need to fix it.</div>
<div><br></div><div> Anyway, workaround: for count(), you can simply write "count(1)" instead of using the actual variable, anyway (yes, you can see requiring serializable there was dumb). :)</div><div><br></div>
<div> Edson</div><div><br><div class="gmail_quote">2010/8/23 Wolfgang Laun <span dir="ltr"><<a href="mailto:wolfgang.laun@gmail.com">wolfgang.laun@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
No, not knowingly :-) I'm using the simplest possible setup for KnowledgeBase, KnowledgeBuilder, StatefulKnowledgeSession.<br><br>Why should accumulate/count effect persistence?<br><br>-W<br><br><br><div class="gmail_quote">
2010/8/23 Swindells, Thomas <span dir="ltr"><<a href="mailto:TSwindells@nds.com" target="_blank">TSwindells@nds.com</a>></span><br><blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)">You’ve probably configured your system to be using persistence?</span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)">In which case what you are persisting needs to be serializable so that it can be persisted</span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)">Thomas</span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)"> </span></p>
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<p class="MsoNormal"><b><span style="font-size:10pt" lang="EN-US">From:</span></b><span style="font-size:10pt" lang="EN-US"> <a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank">rules-users-bounces@lists.jboss.org</a> [mailto:<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank">rules-users-bounces@lists.jboss.org</a>]
<b>On Behalf Of </b>Wolfgang Laun<br>
<b>Sent:</b> 23 August 2010 12:17<br>
<b>To:</b> Rules Users List<br>
<b>Subject:</b> [rules-users] counting facts of a kind</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal">As simple as it gets:<br>
<br>
rule countHigh<br>
when<br>
$n : Number() from accumulate ( $sgc : StartGoalConn() count( $sgc ) )<br>
then<br>
System.out.println( "plain routes: " + $n );<br>
end<br>
<br>
And yet, it fails:<br>
<br>
Exception in thread "main" org.drools.RuntimeDroolsException: java.lang.ClassCastException: rss.ixl.route.TrainStartGoalConn cannot be cast to java.io.Serializable<br>
<br>
Sure, adding "implements Serializable" to StartGoalConn fixes this. But why is this necessary?<br>
<br>
FYI, StartGoalConn is abstract superclass of TrainStartGoalConn - just in case this has some bearing on this issue.<br>
<br>
Best<br>
-W</p>
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<br></blockquote></div><br><br clear="all"><br>-- <br> Edson Tirelli<br> JBoss Drools Core Development<br> JBoss by Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a><br>
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