[rules-users] encounter NullPointerException when adding ruleflow

2011-09-06 Thread James Yu 
Hi all,

I tried to run Drools in a webapp, it runs smoothly when I only load simple
rules.
The spec I have:
AP server -- WASCE2.1 (or geronimo 2.1)
Spring -- 3.0.5
Drools -- 5.2 Fianl
JVM -- IBM SDK 1.6

When I tried to use ruleflow -- execute drl in rf, I got
NullPointerException with the following trace:

exception

org.springframework.web.util.NestedServletException: Request processing
failed; nested exception is java.lang.NullPointerException

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)

org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)

root cause

java.lang.NullPointerException

org.drools.compiler.PackageBuilder.addProcessFromXml(PackageBuilder.java:516)

org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:556)

org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)

net.viralpatel.drools.core.DroolsCore.createKnowledgeBase(DroolsCore.java:17)

net.viralpatel.contact.controller.ContactController.listContacts(ContactController.java:41)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:59)

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:39)
java.lang.reflect.Method.invoke(Method.java:612)

org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)

org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)

org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)

org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)

org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)

org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)


net.viralpatel.drools.core.DroolsCore.createKnowledgeBase(DroolsCore.java:17)
is the following line:
builder.add(ResourceFactory.newClassPathResource(basicFlow.rf),
ResourceType.DRF);

Any advise is appreciated.


This is a UTF-8 formatted mail
---
James C.-C.Yu
___
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users

Re: [rules-users] encounter NullPointerException when adding ruleflow

2011-09-06 Thread Swindells, Thomas 
Are you sure that basicFlow.rf is in your classpath correctly?

From: rules-users-boun...@lists.jboss.org 
[mailto:rules-users-boun...@lists.jboss.org] On Behalf Of James Yu
Sent: 06 September 2011 10:08
To: rules-users@lists.jboss.org
Subject: [rules-users] encounter NullPointerException when adding ruleflow

Hi all,

I tried to run Drools in a webapp, it runs smoothly when I only load simple 
rules.
The spec I have:
AP server -- WASCE2.1 (or geronimo 2.1)
Spring -- 3.0.5
Drools -- 5.2 Fianl
JVM -- IBM SDK 1.6

When I tried to use ruleflow -- execute drl in rf, I got NullPointerException 
with the following trace:

exception

org.springframework.web.util.NestedServletException: Request processing failed; 
nested exception is java.lang.NullPointerException

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)

org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)

root cause

java.lang.NullPointerException

org.drools.compiler.PackageBuilder.addProcessFromXml(PackageBuilder.java:516)

org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:556)

org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)

net.viralpatel.drools.core.DroolsCore.createKnowledgeBase(DroolsCore.java:17)

net.viralpatel.contact.controller.ContactController.listContacts(ContactController.java:41)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:59)

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:39)
java.lang.reflect.Method.invoke(Method.java:612)

org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)

org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)

org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)

org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)

org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)

org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
javax.servlet.http.HttpServlet.service(HttpServlet.java:806)


net.viralpatel.drools.core.DroolsCore.createKnowledgeBase(DroolsCore.java:17) 
is the following line:
builder.add(ResourceFactory.newClassPathResource(basicFlow.rf), 
ResourceType.DRF);

Any advise is appreciated.


This is a UTF-8 formatted mail
---
James C.-C.Yu




**
This message is confidential and intended only for the addressee. If you have 
received this message in error, please immediately notify the 
postmas...@nds.com and delete it from your system as well as any copies. The 
content of e-mails as well as traffic data may be monitored by NDS for 
employment and security purposes. To protect the environment please do not 
print this e-mail unless necessary.

NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, 
United Kingdom. A company registered in England and Wales. Registered no. 
3080780. VAT no. GB 603 8808 40-00
**
___
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users

Re: [rules-users] encounter NullPointerException when adding ruleflow

2011-09-06 Thread Wolfgang Laun 
2011/9/6 Swindells, Thomas tswinde...@nds.com

  Are you sure that basicFlow.rf is in your classpath correctly?



The NPE does happen when the file is missing.

One can't test the returned org.drools.io.Resource object - an object is
returned from
   ResourceFactory.newClassPathResource(no such filef)

So I think that either the ResourceFactory or the Builder should produce a
decent error message. NPE is phooey.

-W
___
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users

Re: [rules-users] encounter NullPointerException when adding ruleflow

2011-09-06 Thread Wolfgang Laun 
Indeed. The NPE is caused by the PackageBuilder not having a ProcessBuilder.
It tries to create one, but this fails silently.

You need this class
org.jbpm.process.builder.ProcessBuilderFactoryServiceImpl

-W

On 6 September 2011 12:55, James cyu...@gmail.com wrote:

 I am sure that I have basicRule.drl and basicFlow.rf in classpath as
 they
 are located in WEB-INF\classes

 --
 View this message in context:
 http://drools.46999.n3.nabble.com/rules-users-encounter-NullPointerException-when-adding-ruleflow-tp3312967p3313177.html
 Sent from the Drools: User forum mailing list archive at Nabble.com.
 ___
 rules-users mailing list
 rules-users@lists.jboss.org
 https://lists.jboss.org/mailman/listinfo/rules-users

___
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users

Re: [rules-users] encounter NullPointerException when adding ruleflow

2011-09-06 Thread James 
I am sure that I have basicRule.drl and basicFlow.rf in classpath as they
are located in WEB-INF\classes

--
View this message in context: 
http://drools.46999.n3.nabble.com/rules-users-encounter-NullPointerException-when-adding-ruleflow-tp3312967p3313177.html
Sent from the Drools: User forum mailing list archive at Nabble.com.
___
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users