[rules-users] Failing serialisation of large rule base

[Michal Bali]

Hi Jen,

I am not sure why do you get the nullpointer exception.
As far as I know you shouldn't serialize the Marshaller. Just re-create it.
The serializableMarshaller is stateless.

Regards,
Michal


On Sun, Jul 12, 2009 at 5:00 PM, LadyCode <j_whittlesea at hotmail.com> wrote:

>
> Hi Michal,
>
> With regard to point 2, the StackOverflowException was thrown based on
> standard Java stack size and not from within the DroolsObject stream as I
> thought. Increasing the stack size allowed me to serialise the full
> KnowledgeBase with noticable speed results.
>
> I am keen to do things 'properly' though so on to point 3....
>
> The method 'createSerializableMarshaller' in MarshallingTest.java takes a
> KnowledgeBase as parameter. So I create a Marshaller and .marshall the
> StatefulKnowledgeSession. No problems.
>
> Then to unmarshall I create a new Marshaller? but I no longer have the same
> knowledgeBase and a null pointer exception is thrown when I use
> marshaller.unmarshall.
>
> java.lang.NullPointerException
>        at
>
> org.drools.common.ConcurrentNodeMemories.getNodeMemory(ConcurrentNodeMemories.java:69)
>        at
>
> org.drools.common.AbstractWorkingMemory.getNodeMemory(AbstractWorkingMemory.java:1534)
>        at
>
> org.drools.marshalling.impl.InputMarshaller.readFactHandles(InputMarshaller.java:334)
>        at
>
> org.drools.marshalling.impl.InputMarshaller.readSession(InputMarshaller.java:207)
>        at
>
> org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:75)
>        at
>
> org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:47)
>
>
> Or am I misunderstanding... should I be able to serialise the Marshaller
> created in createSerializableMarshaller? This would make sense by the
> name!!
> How do I serialise it? DroolsObjectOutputStream?
>
> Regards,
>
> Jen
>
>
>
> Michal Bali-2 wrote:
> >
> > Hi Jen,
> >
> > To answer your 3. point. You can create a serializable marshaller like
> > this:
> >
> > MarshallerFactory.newSerializeMarshallingStrategy( acceptor );
> >
> > You can find complete examples here:
> >
> http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/integrationtests/MarshallingTest.java
> >
> > Best regards,
> > Michal
> >
> >
> > On Sat, Jul 11, 2009 at 11:55 PM, LadyCode <j_whittlesea at hotmail.com>
> > wrote:
> >
> >>
> >> Hi,
> >>
> >> I have written a Java application that reads in approximately 6000 .dslr
> >> rules at runtime. This takes around 6minutes, however I have installed
> >> the
> >> application on the target (rather old!) machine and load time is in
> >> excess
> >> of 20minutes. I have been trying without success to find a way to speed
> >> up
> >> loading:
> >>
> >> I have tried:
> >>
> >> 1. Serialising the KnowledgePackages themselves. This works well but has
> >> limited effect on load time.
> >> 2. Serialising the KnowledgeBase, this does not seem to work on large
> >> rule
> >> bases and fails with StackOverflowException when I load more than about
> >> 200
> >> rules.
> >> 3. Serialising the StatefulKnowledgeSession using
> >>
> >> Marshaller marshaller = MarshallerFactory.newMarshaller(knowledgeBase);
> >> marshaller.marshall(out, session);
> >>
> >> This works well for the life of the marshaller but does not solve my
> >> problem
> >> as I need to restart the application and therefore cannot use the same
> >> instance of marshaller later on. Marshaller is not serialisable.
> >>
> >> I know some of these points are discussed in other posts. But is there
> >> anything I can do or have I missed the point?
> >>
> >> Any help or comments very much appreciated,
> >>
> >> Regards,
> >> Jen
> >> --
> >> View this message in context:
> >>
> http://www.nabble.com/Failing-serialisation-of-large-rule-base-tp24444231p24444231.html
> >> Sent from the drools - user mailing list archive at Nabble.com.
> >>
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> >>
> >
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> >
>
> --
> View this message in context:
> http://www.nabble.com/Failing-serialisation-of-large-rule-base-tp24444231p24449888.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
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