[rules-dev] Can't execute rules twice with a second classloader

[Aaron Dixon]

Here you go. It's an eclipse project. Only dependencies are the Drools
4 deps. You'll see clearly in .classpath -- Run "Driver". Let me know
if you have problems.

On 7/13/07, Mark Proctor <mproctor at codehaus.org> wrote:
> can you make an integration test for us? As we'll need to be easily able
> to reproduce this. We'll add it to our code base and fix. We'll probably
> add it as aprt of the MiscTest class:
> http://anonsvn.labs.jboss.com/labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/integrationtests/MiscTest.java
>
>
> Aaron Dixon wrote:
> > I am trying to sequentially perform two rules executions using two
> > different classloaders in the same VM. I create completely new state
> > for each execution, yet I still fail on the second execution. I
> > believe this has to do with some internal static cached state that
> > JBossRules is maintaining. A snippet of the code and exeception are
> > shown in this email.
> >
> >    public void demo() throws Exception {
> >        // Save original classloader
> >        ClassLoader original =
> > Thread.currentThread().getContextClassLoader();
> >
> >        // Create Classloader 1 with parent of original
> >        FooClassLoader loader1 = new FooClassLoader(original);
> >        Thread.currentThread().setContextClassLoader(loader1);
> >        testRules();
> >
> >        // Success so far...
> >
> >        // Create Classloader 2 with parent of original
> >        FooClassLoader loader2 = new FooClassLoader(original);
> >        Thread.currentThread().setContextClassLoader(loader2);
> >        testRules();
> >
> >        // Never make it to here.
> >
> >        // Restore
> >        Thread.currentThread().setContextClassLoader(original);
> >    }
> >
> >    private void testRules() throws Exception {
> >        PackageBuilder builder = new PackageBuilder();
> >        Package pkg = buildPackage(new String[] { "Foo.drl" }, builder);
> >        RuleBase base = RuleBaseFactory.newRuleBase();
> >        base.addPackage(pkg);
> >        StatelessSession session = base.newStatelessSession();
> >        final ClassLoader loader =
> > Thread.currentThread().getContextClassLoader();
> >        Object inst = loader.loadClass("com.foo.Foo").newInstance();
> >        session.execute(new Object[] { inst });
> >    }
> >
> >
> >
> > Exception in thread "main" java.lang.ClassCastException:
> > adixon.prototype.rules.classloader.demo.copy.FooShadowProxy
> >     at
> > org.drools.base.adixon.prototype.rules.classloader.demo.copy.Foo$getName.getValue(Unknown
> >
> > Source)
> >     at
> > org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:94)
> >     at
> > org.drools.base.evaluators.StringFactory$StringEqualEvaluator.evaluate(StringFactory.java:85)
> >
> >     at
> > org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:61)
> >     at
> > org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:82)
> >     at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:121)
> >     at
> > org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:20)
> >
> >     at
> > org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:159)
> >     at org.drools.reteoo.Rete.assertObject(Rete.java:175)
> >     at
> > org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
> >     at
> > org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70)
> >
> >     at
> > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:772)
> >
> >     at
> > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:584)
> >
> >     at
> > org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:63)
> >
> >     at
> > adixon.prototype.rules.classloader.demo.copy.Driver.testRules(Driver.java:47)
> >
> >     at
> > adixon.prototype.rules.classloader.demo.copy.Driver.go(Driver.java:33)
> >     at
> > adixon.prototype.rules.classloader.demo.copy.Driver.main(Driver.java:17)
> > _______________________________________________
> > rules-dev mailing list
> > rules-dev at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-dev
> >
>
> _______________________________________________
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>
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