[flexcoders] (Flex20b2) RemoteObject access problem

Tue, 25 Apr 2006 22:47:35 -0700

Hi,

I have posted a couple of messages on calling a method on a Java object using <mx:RemoteObject> tag but so far I haven't been successful. With help from Peter & Suresh I did proceed a little bit further but I am still unable to successfully call the method on the server side object.  Since I described the problem in bits & pieces before, I think that I may have missed some step(s) which I don't know about. Here is what I have done step by step. Please let me know if I am doing anything wrong or not doing something.

Basically what I wanted to do was to verify the connectivity from the browser side to a simple Java class on the back end using RemoteObject tag before doing anything major. To do this I take a (String) name from a TextInput field which is sent to the getString() method of the class called Echo which appends "Welcome " to the incoming String & returns it back. This is displayed by the state 'TargetState'.

1. Here is the mxml file named SimpleRemoteObject.mxml. Please take a look at my ActionScript methods as I am new to ActionScript as well.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns="*" layout="absolute">
<mx:TraceTarget level="0" />
<mx:Script>
    <![CDATA[
        import mx.rpc.events.*;
        import mx.collections.*;
        import mx.controls.*
       
        private function getNameHandler(event:ResultEvent):void
        {
            Result.text = event.result.toString();
            currentState='TargetState';
        }
       
        private function faultHandler(event:FaultEvent):void
        {
            Alert.show(event.fault.faultstring, "Error");
            Alert.show(event.fault.faultDetail, "Error");   
        }
    ]]>
</mx:Script>
    <mx:states>
        <mx:State name="TargetState">
            <mx:RemoveChild child="{button1}"/>
            <mx:RemoveChild child="{formInput}"/>
            <mx:RemoveChild child="{label1}"/>
            <mx:AddChild position="lastChild">
                <mx:Label x="99" y="130" width="265" height="28" id="Result"/>
            </mx:AddChild>
        </mx:State>
    </mx:states>

    <mx:RemoteObject id="sendStringBack" destination="EchoString" showBusyCursor="true" fault="faultHandler(event)">
        <mx:method name="getString" result="getNameHandler(event)">
            <mx:arguments>
                <str>
                {formInput.text}
                </str>
            </mx:arguments>
        </mx:method>
    </mx:RemoteObject>
    <mx:TextInput x="119" y="129" id="formInput"/>
    <mx:Button x="119" y="170" label="Submit" fontSize="13" id="button1" click="sendStringBack.getString.send()"/>
    <mx:Label x="119" y="86" text="What is your name ?" width="160" fontSize="15" id="label1"/>   
</mx:Application>

For this project I defined the Flex root folder at  C:\tomcat-5.5.9\webapps\flex & flex server URL to http://localhost:8080/flex/.

2. Defined the destination EchoString in C:\tomcat-5.5.9\webapps\flex\WEB-INF\flex\flex-remoting-service.xml as follows,

    <adapters>
        <adapter-definition id="java-object" class="flex.messaging.services.remoting.adapters.JavaAdapter" default="true"/>
    </adapters>

    <default-channels>
        <channel ref="my-amf"/>
    </default-channels>

    <destination id="EchoString">
        <properties>
            <source>samples.SimpleRemoteObject.Echo</source>
        </properties>
    </destination>
 
3. Saved the mxml file in Flex Builder which created C:\tomcat-5.5.9\webapps\flex\SimpleRemoteObject directory & put the HTML, SWFs & _javascript_ files in it.

4. Compiled the Java class called Echo.java & put Echo.class in C:\tomcat-5.5.9\webapps\flex\WEB-INF\classes\samples\SimpleRemoteObject.

package samples.SimpleRemoteObject;
public class Echo {
    public Echo(){
    }
    public String getString(String str){
        System.out.println("In Echo::getString(), got " + str);
        return "Welcome " + str ;
    }
}

5. Started tomcat & went to,
http://localhost:8080/flex/SimpleRemoteObject/SimpleRemoteObject.html

6. First page got painted fine, input a name & clicked on 'Submit'

7. I get Channel.Connect.Failed error. NetConnection.Call.Failed error:HTTP:Failed in the Alert box.

C:\tomcat-5.5.9\webapps\flex\WEB-INF\flex\flex-enterprise-services.xml has,

        <channel-definition id="my-amf" class="mx.messaging.channels.AMFChannel">
            <endpoint uri="http://{server.name}:{server.port}/{context.root}/messagebroker/amf" class="flex.messaging.endpoints.AMFEndpoint"/>
            <properties>
                <polling-enabled>false</polling-enabled>
            </properties>
        </channel-definition>


Thanks,
Aejaz


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