[rules-users] Marshalling/Unmarshalling KnowledgeBase/StatefulSession

[Paulo Reis]

Hi,

I've tried to serialize the KnowledgeBase to use later but when I do that, I get NullPointer in few rules that doesn't happens when running while building it form scrap:

Caused by: javax.ejb.EJBException: Exception executing consequence for rule "process sentence" in my.rules: java.lang.NullPointerException
	--
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
	at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
	at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5388)
	at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
	at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:42)
	at sun.reflect.GeneratedMethodAccessor277.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)


Im afraid that some transient attributes are used. Should I cache it on RAM?

Thanks in advance.

Paulo Reis
casmeiron at gmail.com



On Aug 23, 2012, at 2:24 PM, Paulo Reis <casmeiron at gmail.com> wrote:

> Thank you guys.
> I will take the advices, will try storing the bytes on the db and later recasting to object or putting on the server memory.
> 
> I didn't know I could serialize KnowledgeBase.
> 
> Thanks.
> 
> Paulo Reis
> casmeiron at gmail.com
> 
> 
> 
> On Aug 23, 2012, at 12:39 PM, lhorton <LHorton at ABCLegal.com> wrote:
> 
>> At my shop, our design is to build the knowledge bases only once, when the
>> rules server starts up.  Each knowledge base stays in server memory, and a
>> session (we use stateless) is created for each request, when the request
>> comes in.   Creating the knowledge base is slow, but session creation is
>> very fast (we have thousands of rules).  If you search this forum on
>> "knowledge base expensive" you'll find lots of tuning advice.
>> 
>> 
>> 
>> --
>> View this message in context: http://drools.46999.n3.nabble.com/rules-users-Marshalling-Unmarshalling-KnowledgeBase-StatefulSession-tp4019349p4019365.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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> 

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