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

[Mark Proctor]

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)
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