Use [RemoteClass] metdata instead
________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of ash4os Sent: Saturday, July 05, 2008 11:17 PM To: [email protected] Subject: [flexcoders] Problem with IExternalizable Hi everyone, I am relatively new at Flex and am having writing a sample using the IExternalizable interface. I have a Java object on the server side that I want to send to the Flash player. I have searched through the older posts on this group and on various other blog posts but not much help. Here is the sample code: (sorry if it is a bit long) >>>>>>>>>>>>>>>>>>>>>>>>>>>> File: ResultObj.as package { import flash.utils.IDataInput; import flash.utils.IDataOutput; import flash.utils.IExternalizable; [RemoteClass(alias="ResultObj")] public class ResultObj implements IExternalizable { // number of records &n! bsp; public var m_numRecords:int; // view name public var m_viewName:String; public function ResultObj() { } public function readExternal (input:IDataInput):void { m_viewName = input.readObject(); m_numRecords = input.readInt(); } public function writeExternal (output:IDataOutput):void ! ; { ! ; output.writeObject(m_viewName); output.writeInt(m_numRecords); } } } >>>>>>>>>>>>>>>>>>>>>>>>>>>> File: main.mxml <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="absolute"> <mx:RemoteObject id="ViewObj" destination="ViewRemoteObject"> <mx:method name="foo"> <mx:arguments> <Arg1> rowId </Arg1> <Arg2> numRows </Arg2> </mx:arguments> </mx:method> <mx! :method name="getResults"> <mx:arguments> <Arg1> accRowId </Arg1> <Arg2> numRows </Arg2> </mx:arguments> </mx:method> </mx:RemoteObject> <mx:Script> <![CDATA[ import mx.rpc.remoting.mxml.RemoteObject; import mx.rpc.events.ResultEvent; import ResultObj;! &nbs! p; ; // create a compile time dependency on ResultObj class private static const REG:* = registerClassAlias("ResultObj",ResultObj); private var m_ResultObj:ResultObj; private function getList(event:Event):void { ViewObj.addEventListener(ResultEvent.RESULT, displayResponse); ViewObj.addEventListener(FaultEvent.FAULT, displayFault); ViewObj.getResults(AccountId.text, 1); registerClassAlias("ResultObj", ResultObj); &n! bsp; } private function displayResponse(resEvt:ResultEvent):void { Alert.show("displayReponse called, " + resEvt.toString()); m_ResultObj = resEvt.result as ResultObj; } private function displayFault(resEvt:Event):void { Alert.show("displayFault called, " + resEvt.toString()); } ]]> </mx:Script> <mx:WipeLeft id="myWL" duration="500"/> <mx:Panel width="617" height="608" layout="absolute" left=! "10" top="10" title="Account Detail" id="AcctOptView"> &! nbsp;&nb sp; <mx:VDividedBox x="10" y="0" height="480" width="577"> <mx:Canvas label="AccountsCanvas" width="100%" height="100%" backgroundColor="#FFFFCC"> <mx:Form x="10" y="10" width="557" height="215" > <mx:FormHeading label="Enter Account Details" width="304" /> <mx:FormItem label="Account Name"> <mx:TextInp! ut id="AccountName" width="200" text=""/> </mx:FormItem> <mx:FormItem label="Account Id"> <mx:TextInput id="AccountId" width="100"/> </mx:FormItem> <mx:FormItem label="Primary Contact"> <mx:TextInput id="PrimaryContact" width="200" /> &nb! sp; </mx:FormItem> &nb! sp; ; <mx:Button label="GetAccounts" click="getList(event)" id="GetAccounts"/> </mx:Form> </mx:Canvas> <mx:Canvas label="Canvas 1" width="100%" height="100%" backgroundColor="#FFFFCC"> </mx:Canvas> </mx:VDividedBox> </mx:Panel> </mx:Application> And I have the following in the remoting-config.xml <! ;destination id="ViewRemoteObject"> <properties> <source>MyView</source> </properties> </destination> On the Java side I have following source code: >>>>>>>>>>>>>>>>>>>>>>>>>>>MyView.java public class MyView { public MyView () { } public ResultObj getResults (String viewName, int numRecords) { ResultObj res = new ResultObj (); return (res); } } >>>>>>>>>>>>>>>>>>>>>>>>>>> ResultObj.java public class ResultObj implements Externalizable { ! private String m_! viewName ; private Integer m_numRecords; public ResultObj() { m_numRecords = new Integer (0); m_viewName = new String ("Dummy Default View"); } /* * (non-Javadoc) * @see java.io.Externalizable#readExternal(java.io.ObjectInput) */ public void readExternal (ObjectInput in) throws IOException, ClassNotFoundException { m_viewName = (String) in.readObject(); m_numRecords = in.readInt(); } /* * (non-Javadoc) * @see java.io.Externalizable#writeExternal(java.io.ObjectOutput) * * Serializes the server state of an instance of ResultObj * to the AMF client (Flash in the browser) */ public void writeExternal (ObjectOutput out) throws IOException { System.err.println("[ResultObj::writeExternal]"); out.writeObject(m_viewName); out.writeInt(m_numRecords); System.err.println("Completed [ResultObj::writeExternal]"); } } Both the Java files are compiled and put under D:\lcds\jrun4\servers\default\flex\WEB-INF\classe! s. I debugged this more and the method MyView::getResults is b! eing inv oked and the method ResultObj::writeExternal also gets invoked successfully but on the browser side I get the following error ArgumentError: Error #2004: One of the parameters is invalid. And then I get the following error: displayFault called, [FaultEvent fault=[RPC Fault faultString="Didn't receive an acknowledge message" faultCode="Server.Acknowledge.Failed" faultDetail="Was expecting mx.messaging.messages.AcknowledgeMessage, but received null"] messageId="CEE768B6-6010-738A-C432-5C83918438BE" type="fault" bubbles=false cancelable=true eventPhase=2] So I am guessing the browser side doesn't know to construct the object ResultObj.as. If anyone can shed some light on how to fix it that would be very much appreciated. Many thanks, Ash
