Hi Jen,<br><br>I am not sure why do you get the nullpointer exception.<br>As far as I know you shouldn't serialize the Marshaller. Just re-create it. The serializableMarshaller is stateless.<br><br>Regards,<br>Michal<br>
<br><br><div class="gmail_quote">On Sun, Jul 12, 2009 at 5:00 PM, LadyCode <span dir="ltr"><<a href="mailto:j_whittlesea@hotmail.com">j_whittlesea@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
Hi Michal,<br>
<br>
With regard to point 2, the StackOverflowException was thrown based on<br>
standard Java stack size and not from within the DroolsObject stream as I<br>
thought. Increasing the stack size allowed me to serialise the full<br>
KnowledgeBase with noticable speed results.<br>
<br>
I am keen to do things 'properly' though so on to point 3....<br>
<br>
The method 'createSerializableMarshaller' in MarshallingTest.java takes a<br>
KnowledgeBase as parameter. So I create a Marshaller and .marshall the<br>
StatefulKnowledgeSession. No problems.<br>
<br>
Then to unmarshall I create a new Marshaller? but I no longer have the same<br>
knowledgeBase and a null pointer exception is thrown when I use<br>
marshaller.unmarshall.<br>
<br>
java.lang.NullPointerException<br>
at<br>
org.drools.common.ConcurrentNodeMemories.getNodeMemory(ConcurrentNodeMemories.java:69)<br>
at<br>
org.drools.common.AbstractWorkingMemory.getNodeMemory(AbstractWorkingMemory.java:1534)<br>
at<br>
org.drools.marshalling.impl.InputMarshaller.readFactHandles(InputMarshaller.java:334)<br>
at<br>
org.drools.marshalling.impl.InputMarshaller.readSession(InputMarshaller.java:207)<br>
at<br>
org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:75)<br>
at<br>
org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:47)<br>
<br>
<br>
Or am I misunderstanding... should I be able to serialise the Marshaller<br>
created in createSerializableMarshaller? This would make sense by the name!!<br>
How do I serialise it? DroolsObjectOutputStream?<br>
<br>
Regards,<br>
<br>
Jen<br>
<div><div></div><div class="h5"><br>
<br>
<br>
Michal Bali-2 wrote:<br>
><br>
> Hi Jen,<br>
><br>
> To answer your 3. point. You can create a serializable marshaller like<br>
> this:<br>
><br>
> MarshallerFactory.newSerializeMarshallingStrategy( acceptor );<br>
><br>
> You can find complete examples here:<br>
> <a href="http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/integrationtests/MarshallingTest.java" target="_blank">http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/integrationtests/MarshallingTest.java</a><br>
><br>
> Best regards,<br>
> Michal<br>
><br>
><br>
> On Sat, Jul 11, 2009 at 11:55 PM, LadyCode <<a href="mailto:j_whittlesea@hotmail.com">j_whittlesea@hotmail.com</a>><br>
> wrote:<br>
><br>
>><br>
>> Hi,<br>
>><br>
>> I have written a Java application that reads in approximately 6000 .dslr<br>
>> rules at runtime. This takes around 6minutes, however I have installed<br>
>> the<br>
>> application on the target (rather old!) machine and load time is in<br>
>> excess<br>
>> of 20minutes. I have been trying without success to find a way to speed<br>
>> up<br>
>> loading:<br>
>><br>
>> I have tried:<br>
>><br>
>> 1. Serialising the KnowledgePackages themselves. This works well but has<br>
>> limited effect on load time.<br>
>> 2. Serialising the KnowledgeBase, this does not seem to work on large<br>
>> rule<br>
>> bases and fails with StackOverflowException when I load more than about<br>
>> 200<br>
>> rules.<br>
>> 3. Serialising the StatefulKnowledgeSession using<br>
>><br>
>> Marshaller marshaller = MarshallerFactory.newMarshaller(knowledgeBase);<br>
>> marshaller.marshall(out, session);<br>
>><br>
>> This works well for the life of the marshaller but does not solve my<br>
>> problem<br>
>> as I need to restart the application and therefore cannot use the same<br>
>> instance of marshaller later on. Marshaller is not serialisable.<br>
>><br>
>> I know some of these points are discussed in other posts. But is there<br>
>> anything I can do or have I missed the point?<br>
>><br>
>> Any help or comments very much appreciated,<br>
>><br>
>> Regards,<br>
>> Jen<br>
>> --<br>
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