[drools-user] Rules execution ClassLoader

Damien Delautre Wed, 22 Nov 2006 09:31:19 -0800

Hello,

I have rules based on a class which is generated dynamically (my rulesare also generated dynamically).I have found how to specify the ClassLoader to compile the rules (withthe PackageBuilderConfiguration class), but I don't know how to specifythe ClassLoader for the execution.

Can anyone tell me how to do this?
I am using JBRules 3.0.4.


Thanks

   Damien

My code:

Class elementClass = ((ListImpl)contact.getList()).getElementClass(clmSession);

           String className = elementClass.getSimpleName();
           String fullClassName = elementClass.getName();

PackageBuilderConfiguration config = newPackageBuilderConfiguration();

           config.setClassLoader(contact.getClass().getClassLoader());
           PackageBuilder builder = new PackageBuilder(config);

PackageDescr pack = newPackageDescr("com.konversation.core.condition");

           pack.addImport(fullClassName);
           RuleDescr ruleDescr = new RuleDescr("Province = QC");
           AndDescr and = new AndDescr();
           ColumnDescr column = new ColumnDescr(className, "contact");

LiteralDescr fieldConstraint = newLiteralDescr("propProvince", "==", "QC");

           column.addDescr(fieldConstraint);
           and.addDescr(column);
           ruleDescr.setLhs(and);

ruleDescr.setConsequence("System.out.println(\"province =QC\");");

           pack.addRule(ruleDescr);

builder.addPackage(pack);

           RuleBase ruleBase = RuleBaseFactory.newRuleBase();
           ruleBase.addPackage( builder.getPackage() );

WorkingMemory workingMemory = ruleBase.newWorkingMemory();

           FactHandle handle = workingMemory.assertObject(contact);
           workingMemory.fireAllRules();

The DRL generated :
           package com.konversation.core.condition;

           import com.konversation.worlds.List67ElementImpl;



           rule "Province = QC"
                when
                   contact : List67ElementImpl( propProvince == "QC" )

                then
                   System.out.println("province = QC");
           end

The exception:

java.lang.NoClassDefFoundError:com/konversation/worlds/List67ElementImplatorg.drools.base.com.konversation.worlds.List67ElementImpl$getPropProvince.getValue(UnknownSource)at org.drools.base.ClassFieldExtractor.getValue(UnknownSource)

               at org.drools.reteoo.AlphaNodeSwitch.getNode(Unknown Source)

atorg.drools.reteoo.HashedObjectSinkList$1.hasNext(Unknown Source)atorg.drools.reteoo.ObjectSource.propagateAssertObject(Unknown Source)at org.drools.reteoo.ObjectTypeNode.assertObject(UnknownSource)

               at org.drools.reteoo.Rete.assertObject(Unknown Source)

at org.drools.reteoo.ReteooRuleBase.assertObject(UnknownSource)atorg.drools.reteoo.ReteooWorkingMemory.doAssertObject(Unknown Source)atorg.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)atorg.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)

[drools-user] Rules execution ClassLoader

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