配置错误导致的flex不能与Java交互

在JavaEE应用中，访问flex生成的flash，如

http://localhost:8002/flex/FundValue.swf?userName=sysuxk&startDate=2008-1-1&endDate=2009-6-20，发生错误

 

错误信息为：

[RPC Fault faultString="Send failed" faultCode="Client.Error.MessageSend" faultDetail="Channel.Connect.Failed error NetConnection.Call.Failed: HTTP: Status 404: url: 'http://localhost:8002/messagebroker/amf'"]

       at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::faultHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AbstractInvoker.as:220]

       at mx.rpc::Responder/fault()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\Responder.as:53]

       at mx.rpc::AsyncRequest/fault()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AsyncRequest.as:103]

       at mx.messaging::ChannelSet/faultPendingSends()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\ChannelSet.as:1482]

       at mx.messaging::ChannelSet/channelFaultHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\ChannelSet.as:975]

       at flash.events::EventDispatcher/dispatchEventFunction()

       at flash.events::EventDispatcher/dispatchEvent()

       at mx.messaging::Channel/connectFailed()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\Channel.as:997]

       at mx.messaging.channels::PollingChannel/connectFailed()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\channels\PollingChannel.as:354]

       at mx.messaging.channels::AMFChannel/statusHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\channels\AMFChannel.as:390]

 

重要信息为第一行：

[RPC Fault faultString="Send failed" faultCode="Client.Error.MessageSend" faultDetail="Channel.Connect.Failed error NetConnection.Call.Failed: HTTP: Status 404: url: 'http://localhost:8002/messagebroker/amf'"]

Google一下，网上大致意见是http://localhost:8002/messagebroker/amf的地址错误，于是检查配置，发现无误。

由于错误中有提及HTTP: Status 404，故用浏览器访问http://localhost:8002/messagebroker/amf，结果为：

 

 

即该servlet未生效，不能访问。

在web.xml中配置为：

    <!-- MessageBroker Servlet -->

    <servlet>

       <servlet-name>MessageBrokerServlet</servlet-name>

       <display-name>MessageBrokerServlet</display-name>

       <servlet-class>

           flex.messaging.MessageBrokerServlet

       </servlet-class>

       <init-param>

           <param-name>services.configuration.file</param-name>

           <param-value>/WEB-INF/flex/services-config.xml</param-value>

       </init-param>

       <load-on-startup>5</load-on-startup>

    </servlet>

 

    <servlet-mapping>

       <servlet-name>MessageBrokerServlet</servlet-name>

       <url-pattern>/messagebroker/*</url-pattern>

    </servlet-mapping>

于是检查/WEB-INF/flex/services-config.xml，并检查到remoting-config.xml，该配置文件作用是定义flex中用到的java类，发现中有：

    <destination id="myJavaClassRemoteObject">

       <properties>

           <source>flex.SayHelloService</source>

           <scope>application</scope>

       </properties>

    </destination>

配置的flex.SayHelloService在svn中找不到。

 

于是问题原因是：remoting-config.xml中提及的Java类在本地部署系统中找不到，导致MessageBrokerServlet初始化失败，访问不了，从而flex和Java的交互失败。故在出现RPC Fault错误时，第一步应检查http://localhost:8002/messagebroker/amf是否可以访问，并排查xml文件的配置错误。