Oleg,
Are you generating the Castor classes on the fly? I am successfully using
Castor generated classes within the rules engine without any proxy classes.
My process is that I use the Castor ant task to generate objects based upon
my schema. I then develop my rules against the Castor generated objects.
These work just fine with stock JBoss Rules, so the question is why the
proxy classes?
Ron
On 7/17/07, Oleg Yavorsky <oleg_yavorsky(a)yahoo.com> wrote:
Chris,
I'll try to dig it a little too. My problem is that I need to proxy
concrete classes as they are generated from XSD using Castor. If I find
workaround I'll let you know.
Oleg.
*Chris West <crayzfishr(a)gmail.com>* wrote:
Oleg,
So far I have not been successful. I've just posted my thoughts to this
list (under the subject "The effect of not using shadow facts"). Concerning
the class names, my rules only match on an interface type implemented by the
proxies, so the actual class type of the instance does not matter.
-Chris
On 7/13/07, Oleg Yavorsky <oleg_yavorsky(a)yahoo.com> wrote:
>
> Chris,
>
> I'm thinking about using dynamic proxies in my rules too. I'll be glad
> to hear about your success with them. I think that there could be problem
> with matching of facts as they won't be of original class but of Proxy$...
> one. CGLIB approach doesn't have such problem as it just modifies original
> classes' bytecode. I could be wrong, anyway.
>
> Oleg.
>
> *Mark Proctor <mproctor(a)codehaus.org >* wrote:
>
> That is not the only thing that determines shadowing. If you look the
> shadowing is actually determined here:
> if ( !ruleBase.getConfiguration().isShadowProxy() || cls ==
> null || !ruleBase.getConfiguration().isShadowed( cls.getName() ) ) {
> return;
> }
> By default shadowing is turned on for all (none final) bjects, except
> stuff in the org.drools namespace, you have to set exclusion lists.too.
> So if your package has a null namespace it will still attempt to shadow it.
>
> Mark
>
> Chris West wrote:
>
> OK, I just solved my own problem. My proxy had no package, since the
> jdk based proxy is only in a package if it has at least 1 non public
> interface, according to the javadoc.
>
> The suspect code beginning on line 333 is:
>
> String pkgName = cls.getPackage().getName();
> if ( "org.drools.reteoo".equals( pkgName ) || "
> org.drools.base".equals( pkgName ) ) {
> // We don't shadow internal classes
> this.shadowEnabled = false;
> return;
> }
>
> The getPackage() method returns null. In this case, it would be good if
> JBoss Rules handled the null and went on to shadow the object anyway, since
> it is obviously not in the org.drools packages.
>
> Now I'll continue trying to build a test case for my original problem.
>
> Shall I enter a JIRA for this issue?
>
> Thanks,
> -Chris West
>
> On 7/12/07, Chris West <crayzfishr(a)gmail.com> wrote:
> >
> > Hello,
> >
> > I'm trying to use objects that are generated as dynamic proxies
> > (through the java.lang.reflect.Proxy class) as facts in JBoss Rules
> > 4.0 MR3. My project was using CGLib to generate proxies, and they
> > were working just fine in 3.0.6. However, when I tried 4.0, the CGLib
> > based proxies seemed to have a final method that kept the proxies from being
> > proxied as shadow facts. So I rewrote my code to try to use JDK based
> > proxies, and version 4.0 MR3 accepts them and apparently creates
> > shadow facts, but now my rules don't fire correctly.
> >
> > So, in an attempt to create a simple program to illustrate the
> > problem, I ran into a different problem. The attached eclipse project
> > illustrates this problem.
> >
> > The error is:
> >
> > java.lang.NullPointerException
> > at org.drools.reteoo.Rete$ObjectTypeConf.<init>(Rete.java:333)
> > at org.drools.reteoo.Rete.assertObject(Rete.java :152)
> > 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 com.sample.DroolsTest.main(DroolsTest.java:42)
> >
> > Has anyone successfully used JDK based dynamic proxies as facts?
> >
> > Thanks,
> > -Chris West
> >
> >
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