终于在Google App Engine/Java(GAE/J)上成功部署运行Flex+BlazeDS

http://www.iteye.com/topic/428326

 

话说近日Google App Engine终于开始了对Java的支持，让在下这个懒于学习Python的怂人，也有了一试GAE/J的可能。恰逢刚刚开始学习和接触Flex，因此有了将Flex+BlazeDS部署到GAE上的冲动，百度、谷歌了一下发现，尽管网上Flex+BlazeDS+Tomcat的配置方法已经泛滥成灾，但是在GAE/J上部署Flex特别是BlazeDS还没有动静。 
　　没办法，只好自己动手，丰衣足食了。不罗嗦了，首先配置好GAE/J的开发环境，在下用的是标准的eclipse ganymede-SR2和GAE的eclipse plugin，接下来是下载安装Abobe官方提供的Flex Builder 3 Plug-in For eclipse，同时下载BlazeDS-bin待用。 
　　首先建立Google的Web Application Project，然后手工往项目中添加Flex与BlazeDS需要的元素： 
　　(1)将BlazeDS需要的jar文件（blazeds.war\WEB-INF\lib，共12个jar包）拷到工程的lib目录下，并添加到项目的Java Build Path下。 
　　(2)然后要加入Flex BlazeDS需要的配置文件。在WEB-INF下新建一个名为flex的文件夹，将blazeds.war\WEB-INF\flex下的4个xml文件拷到该文件夹下。 
　　(3)修改web.xml文件，加入Flex的配置。 

<context-param>
    <param-name>flex.class.path</param-name>
    <param-value>/WEB-INF/flex/hotfixes,/WEB-INF/flex/jars</param-value>
</context-param>

<!-- Http Flex Session attribute and binding listener support -->
<listener>
    <listener-class>flex.messaging.HttpFlexSession</listener-class>
</listener>

<!-- MessageBroker Servlet -->
<servlet>
    <servlet-name>MessageBrokerServlet</servlet-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>
    <init-param>
        <param-name>flex.write.path</param-name>
        <param-value>/WEB-INF/flex</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>MessageBrokerServlet</servlet-name>
    <url-pattern>/messagebroker/*</url-pattern>
</servlet-mapping>

　　作为一个几乎完全不懂Flex的怂人，在下在网上搜到了一个调用amf的简单例子，就马上Copy过来试试： 

引用

　　1)新建一个java类：Hello.java 

package com;
public class Hello {
    public String hello(String name){
        System.out.println("flex调用我了，真好~~~~");
        return "hello "+name;
    }
}

　　2)为flex配置这个要调用的对象，修改WEB-INF/flex下remoting-config.xml 
加入： 

<destination id="hello"> <properties> <source> com.Hello </source> </properties> </destination>

　　3)编写一个Flex程序 

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Script>
        <![CDATA[
            import mx.rpc.events.ResultEvent;
            function gg(evnet:ResultEvent):void{
            var ff:String = evnet.result as String;
            ggg.text = ff;
            }
            function remotingSayHello():void{
            var sname:String = nameInput.text;
            h.hello(sname);
            }
        ]]>
    </mx:Script>
    <mx:RemoteObject destination="hello" id="h" result="gg(event)" endpoint="/messagebroker/amf" >
    </mx:RemoteObject>
    <mx:TextArea id="ggg" x="109" y="122"/>
    <mx:Button label="say hello" click="remotingSayHello();" x="144" y="193"/>
    <mx:TextInput id="nameInput" x="111" y="63"/>
    <mx:Label text="name" x="47" y="75"/>
</mx:Application>

　　满心欢喜，马上在本地调试启动Google Web Application，出现以下错误： 

"Channel.Connect.Failed error NetConnection.Call.Failed:
HTTP: Status 500: url: 'http://localhost:8080/messagebroker/amf'"

　　控制台上打出log： 

WARNING: /messagebroker/amf
java.lang.RuntimeException: Session support is not enabled in appengine-web.xml.To enable sessions, put true in that file. Without it, getSession() is allowed, but manipulation of sessionattributes is not.
at com.google.apphosting.utils.jetty.StubSessionManager$StubSession.throwException(StubSessionManager.java:67)

　　好吧，这是第一个挫败，修改WEB-INF/appengine-web.xml，在<appengine-web-app>下加入这句： 

<sessions-enabled>true</sessions-enabled>

　　重新启动调试，一切正常，amf调用成功。然后的任务就是将项目部署到Google App Engine上验证我们的应用了。由于众所周知的原因，GAE的JVM对不少Java类的访问都是有限制的，本地运行的成功并不能完全说明问题，还需要实地验证。 
　　果不其然，马上就遇到了致命的错误： 

Warning：**** MessageBrokerServlet failed to initialize due to runtime exception:   Error: java.lang.NoClassDefFoundError: Could not initialize class com.google.apphosting.runtime.security.shared.stub.java.lang.management.ManagementFactory
    at flex.management.PlatformMBeanServerLocator.getMBeanServer(PlatformMBeanServerLocator.java:38)
    at flex.management.BaseControl.register(BaseControl.java:186)
    at flex.management.runtime.AdminConsoleDisplayRegistrar.<init>(AdminConsoleDisplayRegistrar.java:40)
    at flex.management.runtime.messaging.MessageBrokerControl.<init>(MessageBrokerControl.java:85)
    at flex.messaging.MessageBroker.<init>(MessageBroker.java:269)
    at flex.messaging.config.MessagingConfiguration.createBroker(MessagingConfiguration.java:105)
    at flex.messaging.MessageBrokerServlet.init(MessageBrokerServlet.java:112)
    at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:433)
    at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:612)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:139)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:190)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:167)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:127)
    at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235)
    at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4823)
    at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4821)
    at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
    at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:359)
    at com.google.net.rpc.impl.Server$2.run(Server.java:820)
    at com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
    at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516)
    at com.google.net.rpc.impl.Server.startRpc(Server.java:775)
    at com.google.net.rpc.impl.Server.processRequest(Server.java:348)
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