[rules-users] Problem Setting globals in drools session

[Swindells, Thomas]

Having the same JAR containing the same class in the classpath within the same classloader shouldn't make a difference.
However having different jars (or other sources) containing potentially different versions of the same class can cause significant problems.  Furthermore drools doesn't necessarily use a single (or the default) class loader to load all resources - particularly when compiling rules, so it is quite probable that two different (sibling) class loaders are loading the class and so causing this issue.

Thomas
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of Greg Barton
> Sent: 06 July 2010 16:56
> To: Rules Users List
> Subject: Re: [rules-users] Problem Setting globals in drools session
>
> Having it twice in the classpath would make no diffence (at least with the
> default java classloader) as only the first one in the path is used.  Having
> multiple copies of a class in the classpath is generally not a good idea
> because it leads to confusion, but it would not cause this behavior. (multiple
> classloaders would, though)
>
> GreG
>
> On Jul 6, 2010, at 2:33 AM, "PAYET, Manuel" <manuel.payet at capgemini.com>
> wrote:
>
> Looks like you have twice in your classpath the class
> ulb.mfe.srabre.ra.BREINTERFACE :)
> If I were you, I'd check that...
>
> -----Message d'origine-----
> De : rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] De la part de djerir smail
> Envoyé : lundi 5 juillet 2010 21:39
> À : Rules Users List
> Objet : [rules-users] Problem Setting globals in drools session
>
> Hello everybody,
>
> When I try to sett my globals  I get this error
>
> 2010-07-05 21:26:04,531 ERROR [STDERR] java.lang.RuntimeException:
> Illegal class for global. Expected [ulb.mfe.srabre.ra.BREINTERFACE], found
> [ulb.mfe.srabre.ra.BREINTERFACE].
>
> Can anyone explain to me what does this error mean please .
>
> MY DRL FILE
>
> package ulb.mfe.srabre.rule
>
> import ulb.mfe.srabre.ra.BREINTERFACE;
> import ulb.mfe.srabre.ra.DROOLSSLEEAgent;
>
> global ulb.mfe.srabre.ra.BREINTERFACE BRERAInterface; global
> ulb.mfe.srabre.ra.DROOLSSLEEAgent DROOLSSLEEAgent;
>
> rule "MaxBtsAlarmrule"
> dialect "mvel"
>
> when
>
> $B : BREINTERFACE()
> then
>    System.out.println(" HELLO ");
> end
>
>
>
>
> my code
>
>
> public void Insert(Object fact) {
>    try{
>        KnowledgeSessionConfiguration sessConfig =
> KnowledgeBaseFactory.newKnowledgeSessionConfiguration();
>        sessConfig.setOption(ClockTypeOption.get("pseudo"));
>        StatefulKnowledgeSession session =
> knowledgeBase.newStatefulKnowledgeSession();
>        session.setGlobal("BRERAInterface", this.breinter);
>        session.setGlobal("DROOLSSLEEAgent", this.droolssleeAgent);
>        session.insert(this.breinter);
>        System.out.println("Fact is now inserted");
>        session.fireAllRules();
>    } catch (Throwable t) {
>        logger.info("sml couldn't set up a session");
>        t.printStackTrace();
>    }
>    }
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