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发表时间：2009-07-18
最后修改：2009-07-18
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$2.run(Server.java:820) at com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56) at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516) at com.google.net.rpc.impl.Server.startRpc(Server.java:775) at com.google.net.rpc.impl.Server.processRequest(Server.java:348) at com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:436) at com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319) at com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290) at com.google.net.async.Connection.handleReadEvent(Connection.java:428) at com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:762) at com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207) at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101) at com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251) at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:374) at java.lang.Thread.run(Unknown Source) Critical：Uncaught exception from servlet javax.servlet.UnavailableException: Initialization failed. at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:199) 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$2.run(Server.java:820) at com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56) at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516) at com.google.net.rpc.impl.Server.startRpc(Server.java:775) at com.google.net.rpc.impl.Server.processRequest(Server.java:348) at com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:436) at com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319) at com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290) at com.google.net.async.Connection.handleReadEvent(Connection.java:428) at com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:762) at com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207) at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101) at com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251) at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:374) at java.lang.Thread.run(Unknown Source) Error：flex.messaging.request.DuplicateSessionDetected 这两个问题：MessageBrokerServlet failed to initialize和DuplicateSession搞得在下死去活来，百思不得其解，不过幸好在一个几角旮旯发现了一篇美国人Martin的文章，原来是因为BlazeDS使用了在GAE/J白名单之外的class所导致，需要自己手工修改BlazeDS的源码并构建打成jar包以替换，逼得在下只好下载BlazeDS源码自己修改打包，具体解决方法如下： (1)修改WEB-INF/flex/services-config.xml，在<system>下加入下句： <manageable>false</manageable> 这样你这一段的services-config.xml看起来应该是这样
<system>
<manageable>false</manageable>
<redeploy>
<enabled>false</enabled>
<!--
<watch-interval>20</watch-interval>
<watch-file>{context.root}/WEB-INF/flex/services-config.xml</watch-file>
<watch-file>{context.root}/WEB-INF/flex/proxy-config.xml</watch-file>
<watch-file>{context.root}/WEB-INF/flex/remoting-config.xml</watch-file>
<watch-file>{context.root}/WEB-INF/flex/messaging-config.xml</watch-file>
<watch-file>{context.root}/WEB-INF/flex/data-management-config.xml</watch-file>
<touch-file>{context.root}/WEB-INF/web.xml</touch-file>
-->
</redeploy>
</system>
这样就不受JMX的管理了(restricted by GAE)。 (2)替换WEB-INF/lib/flex-messaging-core.jar，下载见附件（基于blazeds-src-3.2.0.3978）： 至此BlazeDS终于能运行于GAE/J上了，当然以上只是一个很简单的测试，在下也只是Flex新手，如有谬误敬请指正，谢谢。 声明：ITeye文章版权属于作者，受法律保护。没有作者书面许可不得转载。
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发表时间：2009-07-18
恩 好的,等我自己也鼓秋鼓秋。
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发表时间：2010-04-11
这个很有意义呢..使用flex的做界面.应用.维护成本比用
html.+ css的成本低很多..尤其是如果是局域网的程序.网络浏览可以不用考虑了. 然后用flex + BlazeDS.提高开发效率. |
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发表时间：2010-05-05
了解一下先
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