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

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

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

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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。?
Java代码??

1. <context-param>??
2. ????<param-name>flex.class.path</param-name>??
3. ????<param-value>/WEB-INF/flex/hotfixes,/WEB-INF/flex/jars</param-value>??
4. </context-param>??
5. ??
6. <!--?Http?Flex?Session?attribute?and?binding?listener?support?-->??
7. <listener>??
8. ????<listener-class>flex.messaging.HttpFlexSession</listener-class>??
9. </listener>??
10. ??
11. <!--?MessageBroker?Servlet?-->??
12. <servlet>??
13. ????<servlet-name>MessageBrokerServlet</servlet-name>??
14. ????<servlet-class>flex.messaging.MessageBrokerServlet</servlet-class>??
15. ????<init-param>??
16. ????????<param-name>services.configuration.file</param-name>??
17. ????????<param-value>/WEB-INF/flex/services-config.xml</param-value>??
18. ????</init-param>??
19. ????<init-param>??
20. ????????<param-name>flex.write.path</param-name>??
21. ????????<param-value>/WEB-INF/flex</param-value>??
22. ????</init-param>??
23. ????<load-on-startup>1</load-on-startup>??
24. </servlet>??
25. ??
26. <servlet-mapping>??
27. ????<servlet-name>MessageBrokerServlet</servlet-name>??
28. ????<url-pattern>/messagebroker/*</url-pattern>??
29. </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?
Java代码??

1. package?com;??
2. public?class?Hello?{??
3. ????public?String?hello(String?name){??
4. ????????System.out.println("flex调用我了，真好~~~~");??
5. ????????return?"hello?"+name;??
6. ????}??
7. }??

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

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

　　3)编写一个Flex程序?
Xml代码??

1. <?xml?version="1.0"?encoding="utf-8"?>??
2. <mx:Application?xmlns:mx="http://www.adobe.com/2006/mxml"?layout="absolute">??
3. ????<mx:Script>??
4. ????????<![CDATA[?
5. ????????????import?mx.rpc.events.ResultEvent;?
6. ????????????function?gg(evnet:ResultEvent):void{?
7. ????????????var?ff:String?=?evnet.result?as?String;?
8. ????????????ggg.text?=?ff;?
9. ????????????}?
10. ????????????function?remotingSayHello():void{?
11. ????????????var?sname:String?=?nameInput.text;?
12. ????????????h.hello(sname);?
13. ????????????}?
14. ????????]]>??
15. ????</mx:Script>??
16. ????<mx:RemoteObject?destination="hello"?id="h"?result="gg(event)"?endpoint="/messagebroker/amf"?>??
17. ????</mx:RemoteObject>??
18. ????<mx:TextArea?id="ggg"?x="109"?y="122"/>??
19. ????<mx:Button?label="say?hello"?click="remotingSayHello();"?x="144"?y="193"/>??
20. ????<mx:TextInput?id="nameInput"?x="111"?y="63"/>??
21. ????<mx:Label?text="name"?x="47"?y="75"/>??
22. </mx:Application>??

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

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

　　控制台上打出log：?
Java代码??

1. WARNING:?/messagebroker/amf??
2. 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.??
3. 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：?
Xml代码??

1. <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：?
Java代码??

1. 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??
2. ????at?flex.management.PlatformMBeanServerLocator.getMBeanServer(PlatformMBeanServerLocator.java:38)??
3. ????at?flex.management.BaseControl.register(BaseControl.java:186)??
4. ????at?flex.management.runtime.AdminConsoleDisplayRegistrar.<init>(AdminConsoleDisplayRegistrar.java:40)??
5. ????at?flex.management.runtime.messaging.MessageBrokerControl.<init>(MessageBrokerControl.java:85)??
6. ????at?flex.messaging.MessageBroker.<init>(MessageBroker.java:269)??
7. ????at?flex.messaging.config.MessagingConfiguration.createBroker(MessagingConfiguration.java:105)??
8. ????at?flex.messaging.MessageBrokerServlet.init(MessageBrokerServlet.java:112)??
9. ????at?org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:433)??
10. ????at?org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256)??
11. ????at?org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)??
12. ????at?org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:612)??
13. ????at?org.mortbay.jetty.servlet.Context.startContext(Context.java:139)??
14. ????at?org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218)??
15. ????at?org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500)??
16. ????at?org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)??
17. ????at?org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)??
18. ????at?com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:190)??
19. ????at?com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:167)??
20. ????at?com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:127)??
21. ????at?com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235)??
22. ????at?com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4823)??
23. ????at?com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4821)??
24. ????at?com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)??
25. ????at?com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:359)??
26. ????at?com.google.net.rpc.impl.Server$2.run(Server.java:820)??
27. ????at?com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)??
28. ????at?com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516)??
29. ????at?com.google.net.rpc.impl.Server.startRpc(Server.java:775)??
30. ????at?com.google.net.rpc.impl.Server.processRequest(Server.java:348)??
31. font-size: 1em; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 38px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 10px; border-left-width: 1px; border-left-style: solid; border-left-color: #d1d7dc; background-

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