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春季创新：IllegalArgumentException：ServletContext不能为null

分类：编程问答

如何解决春季创新：IllegalArgumentException：ServletContext不能为null

|| 我正在尝试在具有BlazeDS 4.0.0.14931，Spring 3.0.5和Spring-BlazeDS-Integration 1.5.0.M2的Apache Tomcat 7.0.12上运行dpHibernate 2.0 RC6 我对配置的了解很深，服务可以很好地解析，基于注释的Entities和Datamodel很好，我可以在FlashBuilder DCD中列出服务，但是一旦我调用服务器的服务方法（只是一个简单的void方法）返回以下Exception。从文档中了解到，其余部分是自动接线的，因此我不确定自己在配置中的什么地方会漏掉一些东西。 
{operation})****************getAll
{invoke} 6823
java.lang.IllegalArgumentException: ServletContext must not be null
at org.springframework.util.Assert.notNull(Assert.java:112)
at org.springframework.web.context.support.WebApplicationContextUtils.getWebApplicationContext(WebApplicationContextUtils.java:109)
at org.springframework.web.context.support.WebApplicationContextUtils.getWebApplicationContext(WebApplicationContextUtils.java:99)
at org.springframework.web.context.support.WebApplicationContextUtils.getrequiredWebApplicationContext(WebApplicationContextUtils.java:82)
at org.dphibernate.serialization.SpringContextSerializerFactory.getContextReference(SpringContextSerializerFactory.java:111)
at org.dphibernate.serialization.SpringContextSerializerFactory.getSerializerContextReference(SpringContextSerializerFactory.java:65)
at org.dphibernate.serialization.SpringContextSerializerFactory.getSerializer(SpringContextSerializerFactory.java:56)
at org.dphibernate.serialization.SpringContextSerializerFactory.getSerializer(SpringContextSerializerFactory.java:51)
at org.dphibernate.adapters.RemotingAdapter.invoke(RemotingAdapter.java:132)
at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183)
at flex.messaging.Messagebroker.routeMessagetoService(Messagebroker.java:1400)
at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:1005)
at flex.messaging.endpoints.AbstractEndpoint$$FastClassBycglib$$1a3ef066.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
at org.springframework.aop.framework.cglib2AopProxy$cglibMethodInvocation.invokeJoinpoint(cglib2AopProxy.java:688)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.flex.core.MessageInterceptionAdvice.invoke(MessageInterceptionAdvice.java:66)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.cglib2AopProxy$FixedChainStaticTargetInterceptor.intercept(cglib2AopProxy.java:572)
at flex.messaging.endpoints.AMFEndpoint$$EnhancerBycglib$$5dafba90.serviceMessage(<generated>)
at flex.messaging.endpoints.amf.MessagebrokerFilter.invoke(MessagebrokerFilter.java:103)
at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158)
at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:44)
at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67)
at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:166)
at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:291)
at flex.messaging.endpoints.AMFEndpoint$$EnhancerBycglib$$5dafba90.service(<generated>)
at org.springframework.flex.servlet.MessagebrokerHandlerAdapter.handle(MessagebrokerHandlerAdapter.java:108)
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:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
[BlazeDS]Exception when invoking service \'remoting-service\': flex.messaging.MessageException: ServletContext must not be null
incomingMessage: Flex Message (flex.messaging.messages.RemotingMessage) 
operation = getAll
clientId = E8B0A041-2F0D-95A8-1F38-D5D244CDA6E4
destination = personService
messageId = 499B6C51-8E26-DD96-9055-79EF0D3823B0
timestamp = 1303420800415
timetoLive = 0
body = 
[

]
hdr(DSId) = E8B03010-7B0F-DED7-6D71-C4623D635D2A
hdr(DSEndpoint) = amf
Exception: flex.messaging.MessageException: ServletContext must not be null
at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:225)
at flex.messaging.Messagebroker.routeMessagetoService(Messagebroker.java:1400)
at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:1005)
at flex.messaging.endpoints.AbstractEndpoint$$FastClassBycglib$$1a3ef066.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
at org.springframework.aop.framework.cglib2AopProxy$cglibMethodInvocation.invokeJoinpoint(cglib2AopProxy.java:688)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.flex.core.MessageInterceptionAdvice.invoke(MessageInterceptionAdvice.java:66)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.cglib2AopProxy$FixedChainStaticTargetInterceptor.intercept(cglib2AopProxy.java:572)
at flex.messaging.endpoints.AMFEndpoint$$EnhancerBycglib$$5dafba90.serviceMessage(<generated>)
at flex.messaging.endpoints.amf.MessagebrokerFilter.invoke(MessagebrokerFilter.java:103)
at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158)
at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:44)
at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67)
at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:166)
at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:291)
at flex.messaging.endpoints.AMFEndpoint$$EnhancerBycglib$$5dafba90.service(<generated>)
at org.springframework.flex.servlet.MessagebrokerHandlerAdapter.handle(MessagebrokerHandlerAdapter.java:108)
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:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.RuntimeException: ServletContext must not be null
at org.springframework.util.Assert.notNull(Assert.java:112)
at org.springframework.web.context.support.WebApplicationContextUtils.getWebApplicationContext(WebApplicationContextUtils.java:109)
at org.springframework.web.context.support.WebApplicationContextUtils.getWebApplicationContext(WebApplicationContextUtils.java:99)
at org.springframework.web.context.support.WebApplicationContextUtils.getrequiredWebApplicationContext(WebApplicationContextUtils.java:82)
at org.dphibernate.serialization.SpringContextSerializerFactory.getContextReference(SpringContextSerializerFactory.java:111)
at org.dphibernate.serialization.SpringContextSerializerFactory.getSerializerContextReference(SpringContextSerializerFactory.java:65)
at org.dphibernate.serialization.SpringContextSerializerFactory.getSerializer(SpringContextSerializerFactory.java:56)
at org.dphibernate.serialization.SpringContextSerializerFactory.getSerializer(SpringContextSerializerFactory.java:51)
at org.dphibernate.adapters.RemotingAdapter.invoke(RemotingAdapter.java:132)
at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183)
... 45 more
    

解决方法

这并不是dpHibernate的问题，而是Spring / Web.xml配置的问题。因此，请认为这是最好的猜测，因为周围的其他人比我更了解helluva。 看来您缺少
web.xml
中的
<context-param />
部分： 
<context-param>
       <param-name>contextConfigLocation</param-name>
        <param-value>
               /WEB-INF/applicationContext.xml
        </param-value>
</context-param>
该摘录取自dpHibernate网站上的一个样本 您看到的错误是由缺少SpringContext引起的，dpHibernate需要使用SpringContext来查找您的Hibernate会话。     ,对不起，需要重新打开... 我配置了我的应用程序，就像lazyOverflow示例一样。但是，当我调用自己的服务来填充ArrayCollection PM时，我总是收到此ServletContext错误。示例是通过LoadRecentQuestionsCommand以及最近查询中的相应结果处理程序，从最近查询PM中调用getRecentQuestions（）的。 http://code.google.com/p/lazyoverflow/source/browse/trunk/flex/src/com/mangofactory/pepper/view/RecentQuestionsPM.as 现在，“服务器配置”与示例中的服务器配置完全相同，只是带有我自己的实体，DAO和服务名称。 就我所能追踪的问题而言： 
SpringContextSerializerFactory:111
ServletContext servletContext = FlexContext.getServletContext();
--> servletContext --> null
    ,感谢您的帮助，最后我可以将其范围缩小到FlexContext.getServletContext（）;。在SpringContextSerializerFactory.java第110行中返回\“ null \”（dpHibernate当前\“ 2.0 \”分支，springExtensions 3.0）。 快速解决方案（保持与当前实现兼容）是将代码更改为如下所示： 
    ServletContext servletContext = FlexContext.getServletContext();
    if(servletContext == null) // fix for Servlet Context must not be null exception during migration to Spring 3.0
        servletContext = FlexContext.getMessageBroker().getServletContext();
    context= WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
不知道我在这里是否做得很丑，但是对我有用。只是想想……这行尝试通过当前的ServletContext获取Web应用程序的根上下文，如果为null，则通过此请求到达的另一个必须存在的上下文（即springMessageBrokerServlet）获取它。     

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