[rules-users] [rules-dev] class loading problems with 5.3.0-Final and 5.4.0-SNAPSHOT

[Mario Fusco]

Mauricio,

I am the author of that change, so maybe I can help.

First of all it seems weird to me that both the 5.3.0-Final and the
5.4.0-SNAPSHOT fail in the same way. I suppose the exception thrown by the
5.3 should be at least slightly different because it uses a different
implementation of the ConsequenceGenerator. If so could you please send
also the exception you get with the 5.3?

Moreover I honestly don't know what WSO2 is but I guess this issue could be
related with some specific constraint in its ClassLoader. Could you give me
some more info in order to allow me to reproduce the same problem? By the
way, does it happens with any rules or do you have a specific use case that
causes this problem?

In the end I can give you a quick workaround, but you will have to change
the Drools source and of course recompile it. If you can do that you have
to go to the JavaDialect class:

https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/main/java/org/drools/rule/builder/dialect/java/JavaDialect.java#L92

comment all the lines using the new ASM*Builders (94, 98, 102, 106) and
uncomment the lines for the corresponding Java*Builer (92, 96, 100, 104). I
know this is not the ideal solution, but at least it will allow us to
figure out if the problem is actually where I am supposing.

I could easily implement a fallback mechanism that will use the old
Builders if the new ones fail for some reason, but before to do that I'd
like to understand what's going on. So it will be great if you could send
be some more details to help me to figure out what's wrong.

I hope this helps,
Mario

On Tue, Nov 15, 2011 at 4:14 PM, Mauricio Salatino <salaboy at gmail.com>wrote:

> Hi guys,
> I'm working here trying to find out a little problem that I'm having with
> Drools 5.4.0-SNAPSHOT and 5.3.0-Final.
> I'm using WSO2 container to deploy a very simple service and when a rule
> gets activated the following exception appears (with 5.4.0-SNAPSHOT):
>
> Exception in thread "Thread-44" java.lang.ClassCircularityError:
> org/drools/rule/builder/dialect/asm/ConsequenceGenerator
> at java.lang.Class.forName0(Native Method)
>  at java.lang.Class.forName(Class.java:247)
> at
> org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:262)
>  at
> org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:105)
> at
> org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.loadClass(JavaDialectRuntimeData.java:540)
>  at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> at
> org.eclipse.core.runtime.internal.adaptor.ContextFinder.loadClass(ContextFinder.java:124)
>  at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> at java.lang.Class.forName0(Native Method)
>  at java.lang.Class.forName(Class.java:247)
> at
> org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:262)
>  at
> org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:105)
> at
> org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.loadClass(JavaDialectRuntimeData.java:540)
>  at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> at
> test.Rule_request_bed_ede4a687c29740c8bb9f13968941e6a1DefaultConsequenceInvoker.evaluate(Unknown
> Source)
>  at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
> at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
>  at org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1229)
> at
> org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:756)
>  at
> org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:732)
> at
> org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:234)
>  at
> com.wordpress.salaboy.hospital.HospitalServiceImpl$1.run(HospitalServiceImpl.java:71)
>
> I'm worried to see that I don't have any problems with 5.1.1 but with
> later version all throw similar issues.
> I will be trying to solve this issue, but if someone has a clue about what
> can be happening here, please let me know.
>
> I know that this can be a particular issue with WSO2, but it looks like
> something has changed inside drools.
>
> Cheers
>
>
> --
>  - CTO @ http://www.plugtree.com
>  - MyJourney @ http://salaboy.wordpress.com
>  - Co-Founder @ http://www.jugargentina.org
>  - Co-Founder @ http://www.jbug.com.ar
>
>  - Salatino "Salaboy" Mauricio -
>
>
> _______________________________________________
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>
>
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