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couldn't load delegation class 'null':

created by Rajan Bansal in jBPM - View the full discussion

My process definition is:::

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

<process-definition name="Resignation" xmlns="urn:jbpm.org:jpdl-3.2">

<start-state name="StartNode">

</event>

</start-state>

</event>

</state>

</event>

</state>

<end-state name="EndNode">

</event>

</end-state>

</process-definition>

And the class handler for that ::

package com.lupin.l2j.handler;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

public class StartHandler implements ActionHandler {

private static Log log = LogFactory.getLog(StartHandler.class);

public void execute(ExecutionContext executionContext) throws Exception {

System.out.println("StartHandler : execute ::::::::::@#$$%^%&*^*^ ");

}

And I got the following error::

09:35:49,272 INFO [STDOUT] processinstanceid---3641

09:35:49,319 WARN [org.hibernate.engine.StatefulPersistenceContext.ProxyWarnLog] Narrowing proxy to class org.jbpm.graph.node.StartState - this operation breaks ==

09:35:49,350 ERROR [org.jbpm.instantiation.Delegation] couldn't load delegation class 'null': java.lang.ClassNotFoundException: class 'null' could not be found by the process classloader

at org.jbpm.instantiation.ProcessClassLoader.findClass(ProcessClassLoader.java:67)

at java.lang.ClassLoader.loadClass(ClassLoader.java:307)

at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

at org.jbpm.instantiation.Delegation.instantiate(Delegation.java:140)

at org.jbpm.instantiation.Delegation.getInstance(Delegation.java:125)

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.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:198)

at org.jbpm.instantiation.Delegation_$$_javassist_93.getInstance(Delegation_$$_javassist_93.java)

at org.jbpm.graph.def.Action.execute(Action.java:121)

at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:255)

at org.jbpm.graph.def.GraphElement.executeActions(GraphElement.java:220)

at org.jbpm.graph.def.GraphElement.fireAndPropagateEvent(GraphElement.java:190)

at org.jbpm.graph.def.GraphElement.fireEvent(GraphElement.java:174)

at org.jbpm.graph.def.Node.leave(Node.java:381)

at org.jbpm.graph.node.StartState.leave(StartState.java:70)

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.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:198)

at org.jbpm.graph.def.Node_$$_javassist_160.leave(Node_$$_javassist_160.java)

at org.jbpm.graph.exe.Token.signal(Token.java:194)

at org.jbpm.graph.exe.Token.signal(Token.java:139)

at org.jbpm.graph.exe.ProcessInstance.signal(ProcessInstance.java:270)

at com.lupin.l2j.jbpm.ProcessInitiator.initiateProcessInstance(ProcessInitiator.java:37)

at com.lupin.l2j.dao.resignation.ResignationDao.insertNew(ResignationDao.java:60)

at com.lupin.l2j.service.resignation.ResignationService.insertNew(ResignationService.java:52)

at com.lupin.l2j.controller.resignation.ResignationController.insertResignation(ResignationController.java:65)

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.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:471)

at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:408)

at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)

at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)

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

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

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

at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:336)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:368)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:177)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:109)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)

at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:169)

at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)

at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:276)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:183)

at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:95)

at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)

at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:872)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951)

at java.lang.Thread.run(Thread.java:662)

09:35:49,350 ERROR [org.jbpm.instantiation.Delegation] couldn't instantiate delegation class 'null': java.lang.NullPointerException

at org.jbpm.instantiation.FieldInstantiator.newInstance(FieldInstantiator.java:105)

at org.jbpm.instantiation.FieldInstantiator.instantiate(FieldInstantiator.java:48)

at org.jbpm.instantiation.Delegation.instantiate(Delegation.java:163)