ofbiz调用服务时报错：Service [xxxService] ran into an unexpected null object (null)

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我是靠谱客的博主成就板凳，最近开发中收集的这篇文章主要介绍ofbiz调用服务时报错：Service [xxxService] ran into an unexpected null object (null)，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

刚接触ofbiz框架不久，在开发helloworld的时候，遇到的问题，报错如下：

---- exception report ----------------------------------------------------------
     [java] Service [showUsers] threw an unexpected exception/error
     [java] Exception: org.ofbiz.service.GenericServiceException
     [java] Message: Service [showUsers] ran into an unexpected null object (null)
     [java] ---- cause ---------------------------------------------------------------------
     [java] Exception: java.lang.NullPointerException
     [java] Message: null
     [java] ---- stack trace ---------------------------------------------------------------
     [java] java.lang.NullPointerException
     [java] sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     [java] sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     [java] java.lang.reflect.Method.invoke(Unknown Source)
     [java] org.ofbiz.service.engine.StandardJavaEngine.serviceInvoker(StandardJavaEngine.java:96)
     [java] org.ofbiz.service.engine.StandardJavaEngine.runSync(StandardJavaEngine.java:54)
     [java] org.ofbiz.service.ServiceDispatcher.runSync(ServiceDispatcher.java:390)
     [java] org.ofbiz.service.ServiceDispatcher.runSync(ServiceDispatcher.java:219)
     [java] org.ofbiz.service.GenericDispatcher.runSync(GenericDispatcher.java:159)
     [java] com.diyagea.event.UserEvent.show(UserEvent.java:26)
     [java] sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     [java] sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     [java] java.lang.reflect.Method.invoke(Unknown Source)
     [java] org.ofbiz.webapp.event.JavaEventHandler.invoke(JavaEventHandler.java:92)
     [java] org.ofbiz.webapp.event.JavaEventHandler.invoke(JavaEventHandler.java:78)
     [java] org.ofbiz.webapp.control.RequestHandler.runEvent(RequestHandler.java:598)
     [java] org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:367)
     [java] org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:202)
     [java] javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
     [java] javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
     [java] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
     [java] org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     [java] org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:259)
     [java] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     [java] org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     [java] org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
     [java] org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
     [java] org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
     [java] org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     [java] org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     [java] org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
     [java] org.ofbiz.catalina.container.CrossSubdomainSessionValve.invoke(CrossSubdomainSessionValve.java:62)
     [java] org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
     [java] org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
     [java] org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     [java] org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     [java] java.lang.Thread.run(Unknown Source)
     [java] --------------------------------------------------------------------------------
     [java] 2015-12-02 14:02:28,475 (http-0.0.0.0-8443-2) [    TransactionUtil.java:285:ERROR] 
     [java] ---- exception report ----------------------------------------------------------
     [java] [TransactionUtil.rollback]
     [java] Exception: java.lang.Exception
     [java] Message: Stack Trace
     [java] ---- stack trace ---------------------------------------------------------------
     [java] java.lang.Exception: Stack Trace
     [java] org.ofbiz.entity.transaction.TransactionUtil.rollback(TransactionUtil.java:284)
     [java] org.ofbiz.entity.transaction.TransactionUtil.rollback(TransactionUtil.java:266)
     [java] org.ofbiz.service.ServiceDispatcher.runSync(ServiceDispatcher.java:509)
     [java] org.ofbiz.service.ServiceDispatcher.runSync(ServiceDispatcher.java:219)
     [java] org.ofbiz.service.GenericDispatcher.runSync(GenericDispatcher.java:159)
     [java] com.diyagea.event.UserEvent.show(UserEvent.java:26)
     [java] sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     [java] sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     [java] java.lang.reflect.Method.invoke(Unknown Source)
     [java] org.ofbiz.webapp.event.JavaEventHandler.invoke(JavaEventHandler.java:92)
     [java] org.ofbiz.webapp.event.JavaEventHandler.invoke(JavaEventHandler.java:78)
     [java] org.ofbiz.webapp.control.RequestHandler.runEvent(RequestHandler.java:598)
     [java] org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:367)
     [java] org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:202)
     [java] javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
     [java] javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
     [java] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
     [java] org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     [java] org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:259)
     [java] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     [java] org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     [java] org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
     [java] org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
     [java] org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
     [java] org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     [java] org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     [java] org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
     [java] org.ofbiz.catalina.container.CrossSubdomainSessionValve.invoke(CrossSubdomainSessionValve.java:62)
     [java] org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
     [java] org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
     [java] org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     [java] org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     [java] java.lang.Thread.run(Unknown Source)
     [java] --------------------------------------------------------------------------------
     [java] 2015-12-02 14:02:28,476 (http-0.0.0.0-8443-2) [    TransactionUtil.java:295:INFO ] [TransactionUtil.rollback] transaction rolled back
     [java] 2015-12-02 14:02:28,476 (http-0.0.0.0-8443-2) [    TransactionUtil.java:219:WARN ] [TransactionUtil.commit] Not committing transaction, status is No Transaction (6)
     [java] 2015-12-02 14:02:28,530 (http-0.0.0.0-8443-2) [     RequestHandler.java:599:INFO ] Ran Event [java:com.diyagea.event.UserEvent#show] from [request], result is [error]
     [java] 2015-12-02 14:02:28,534 (http-0.0.0.0-8443-2) [     RequestHandler.java:414:WARN ] Could not find response in request [show] for event return [error]
     [java] 2015-12-02 14:02:28,534 (http-0.0.0.0-8443-2) [     RequestHandler.java:703:INFO ] Rendering View [show], sessionId=4C8C296E242100020C212A889598E951.jvm1
     [java] org.ofbiz.service.GenericServiceException: Service [showUsers] ran into an unexpected null object (null)
     [java] 	at org.ofbiz.service.engine.StandardJavaEngine.serviceInvoker(StandardJavaEngine.java:110)
     [java] 	at org.ofbiz.service.engine.StandardJavaEngine.runSync(StandardJavaEngine.java:54)
     [java] 	at org.ofbiz.service.ServiceDispatcher.runSync(ServiceDispatcher.java:390)
     [java] 	at org.ofbiz.service.ServiceDispatcher.runSync(ServiceDispatcher.java:219)
     [java] 	at org.ofbiz.service.GenericDispatcher.runSync(GenericDispatcher.java:159)
     [java] 	at com.diyagea.event.UserEvent.show(UserEvent.java:26)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     [java] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     [java] 	at java.lang.reflect.Method.invoke(Unknown Source)
     [java] 	at org.ofbiz.webapp.event.JavaEventHandler.invoke(JavaEventHandler.java:92)
     [java] 	at org.ofbiz.webapp.event.JavaEventHandler.invoke(JavaEventHandler.java:78)
     [java] 	at org.ofbiz.webapp.control.RequestHandler.runEvent(RequestHandler.java:598)
     [java] 	at org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:367)
     [java] 	at org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:202)
     [java] 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
     [java] 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
     [java] 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
     [java] 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     [java] 	at org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:259)
     [java] 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     [java] 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     [java] 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
     [java] 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
     [java] 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
     [java] 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     [java] 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     [java] 	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
     [java] 	at org.ofbiz.catalina.container.CrossSubdomainSessionValve.invoke(CrossSubdomainSessionValve.java:62)
     [java] 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
     [java] 	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
     [java] 	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     [java] 	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     [java] 	at java.lang.Thread.run(Unknown Source)
     [java] Caused by: java.lang.NullPointerException
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     [java] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     [java] 	at java.lang.reflect.Method.invoke(Unknown Source)
     [java] 	at org.ofbiz.service.engine.StandardJavaEngine.serviceInvoker(StandardJavaEngine.java:96)
     [java] 	... 33 more

错误原因：service或event类中方法不是静态的，加上static即可

经过读ofbiz源码，发现ofbiz内部机制是通过调用类名直接调用配置好的service和event类中的静态方法

如果service或event中的方法不加static就会出现上述错误

而Struts和spring框架会把配置好的action和bean初始化好到一个容器中，所以不需要用static