在Flex下， 如果一个项目里面有多个模块时，在第一次加载Module是可以的。在第二次加载module时，“注册”信息会丢失。

即如下的[RemoteClass(alias="com.tjsoft.iess2.po.jxpg.TSysJxUser")]这一行代码；

所产生的错误信息为：

[RPC Fault faultString="Cannot invoke method 'save'." faultCode="Server.ResourceUnavailable" faultDetail="The expected argument types are (com.tjsoft.iess2.po.jxpg.TSysJxUser) but the supplied types were (flex.messaging.io.amf.ASObject) and converted to (null)."]

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 NetConnectionMessageResponder/statusHandler()[C:/autobuild/3.2.0/frameworks/projects/rpc/src/mx/messaging/channels/NetConnectionChannel.as:569]

at mx.messaging::MessageResponder/status()[C:/autobuild/3.2.0/frameworks/projects/rpc/src/mx/messaging/MessageResponder.as:222]

如下为解决办法：在要调用远程对象的Application文件里面，加上如下声明语句：

    import flash.net.registerClassAlias;

   import mx.messaging.messages.RemotingMessage;

    registerClassAlias("com.tjsoft.iess2.po.jxpg.TSysJxUser", JxUser);

下面是项目中的两个相关文件源代码作为示例

// ActionScript file

package jxpg

{

[Bindable]

    [RemoteClass(alias="com.tjsoft.iess2.po.jxpg.TSysJxUser")]

    public class JxUser

    {

        public var id:String;

   public var name:String;

   public var code:String;

   public var createtime:Date;

   public var password:String;

   public var deptid:String;

   public var remark:String;

   public var status:String;

   public var logintype:String;

   public var deptname:String;

    }

}

//Application file

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx=""

xmlns:page="pager.*"

xmlns:dept="jxpg.*"

layout="absolute" verticalAlign="top"

    horizontalAlign="center" paddingTop="0"

    initialize="initApp()" creationComplete="onCreationComplete()" >

    <mx:Style source="skins/blue/blue.css"/>

    <mx:Script>

        <![CDATA[

        import jxpg.JxUser;

    import mx.controls.Alert;

    import mx.collections.ArrayCollection;

    import mx.rpc.events.*;

    import mx.events.ListEvent;

    import mx.managers.PopUpManager;

    import jxpg.utils;

    import mx.events.CloseEvent;

   

    //申请注册别名，使切换模块后仍然能正常通信

    import flash.net.registerClassAlias;

   import mx.messaging.messages.RemotingMessage;

    registerClassAlias("com.tjsoft.iess2.po.jxpg.TSysJxUser", JxUser); //这里才是重点

    }

        ]]>

</mx:Application>

参考资料1：

参考资料2：