spring blazeds 集成：IllegalArgumentException：ServletContext 不能为 null

Question

我正在尝试使用 BlazeDS 4.0.0.14931、Spring 3.0.5 和 Spring-BlazeDS-Integration 1.5.0.M2 在 Apache Tomcat 7.0.12 上运行 dpHibernate 2.0 RC6

我的配置已经很不错了，服务解析得很好、基于注释的实体和数据模型都很好，我可以在 FlashBuilder DCD 中列出服务，但是一旦我调用服务方法（只是一个简单的 void 方法），服务器就会返回以下异常。不太确定在我的配置中我可能错过了一些东西，正如我从文档中了解到的那样，其余部分是自动连接的。

{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

Answer 1

这与其说是 dpHibernate 问题，不如说是 Spring/Web.xml 配置的问题。因此，请认为这是最好的猜测，因为周围还有其他人比我知道得多。

看来您缺少 部分code>web.xml：

<context-param>
       <param-name>contextConfigLocation</param-name>
        <param-value>
               /WEB-INF/applicationContext.xml
        </param-value>
</context-param>

该片段取自 dpHibernate 站点上的示例之一

您看到的错误是由缺少 SpringContext 引起的，dpHibernate 需要该 SpringContext 才能查找您的 Hibernate 会话。

Answer 2

抱歉，需要重新打开...

我的应用程序配置主要类似于lazyOverflow 示例。但是当我调用自己的服务来填充 ArrayCollection PM 时，我不断收到此 ServletContext 错误。示例是通过 LoadRecentQuestionsCommand 从RecentQuestionPM 调用getRecentQuestions() 以及RecentQuestionPM 中的相应结果处理程序。

http:// /code.google.com/p/lazyoverflow/source/browse/trunk/flex/src/com/mangofactory/pepper/view/RecentQuestionsPM.as

服务器配置现在与示例中完全相同，只是我自己的实体、DAO 和服务名称。

据我所知，这就是问题所在：

SpringContextSerializerFactory:111
ServletContext servletContext = FlexContext.getServletContext();
--> servletContext --> null

Answer 3

感谢您的帮助，最后我可以将范围缩小到 FlexContext.getServletContext();在 SpringContextSerializerFactory.java 第 110 行返回“null”（dpHibernate 当前“2.0”分支，springExtensions 3.0）。

对此的快速修复（与当前实现保持兼容）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);

不知道我是否在这里做了一些丑陋的事情，但对我有用。只是想...这一行尝试通过当前的 servletContext 获取 Web 应用程序根上下文，如果这是 null，则只需通过另一个如果此请求到达这里就必须存在的上下文（即 springMessageBrokerServlet）来获取它。