[rules-users] Re: Using JDK dynamic proxies as facts

[Chris West]

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 at 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20070712/f3f0c82b/attachment.html