You’ve probably configured your system to be using persistence?

In which case what you are persisting needs to be serializable so that it can be persisted

 

Thomas

 

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: 23 August 2010 12:17
To: Rules Users List
Subject: [rules-users] counting facts of a kind

 

As simple as it gets:

rule countHigh
when
    $n : Number() from accumulate ( $sgc : StartGoalConn() count( $sgc ) )
then
    System.out.println( "plain routes: " + $n );
end

And yet, it fails:

Exception in thread "main" org.drools.RuntimeDroolsException: java.lang.ClassCastException: rss.ixl.route.TrainStartGoalConn cannot be cast to java.io.Serializable

Sure, adding "implements Serializable" to StartGoalConn fixes this. But why is this necessary?

FYI, StartGoalConn is abstract superclass of TrainStartGoalConn - just in case this has some bearing on this issue.

Best
-W



**************************************************************************************
This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmaster@nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary.

NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00
**************************************************************************************