Are you sure that basicFlow.rf is in your classpath correctly?
From: [email protected]
[mailto:[email protected]] On Behalf Of James Yu
Sent: 06 September 2011 10:08
To: [email protected]
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.
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James C.-C.Yu
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