Are you sure that basicFlow.rf is in your classpath correctly? From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of James Yu Sent: 06 September 2011 10:08 To: rules-users(a)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 postmaster(a)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 **************************************************************************************

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-NullPointerExcept... Sent from the Drools: User forum mailing list archive at Nabble.com.