Below is Flex code sample to communicate to a Java servlet in the back-end using HTTP Post Service. <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns="*" creationComplete="send_data()"> <mx:Script> <![CDATA[ private function send_data():void { userRequest.send(); } ]]> </mx:Script> <mx:Form x="22" y="10" width="493"> <mx:HBox> <mx:Label text="Username"/> <mx:TextInput id="username"/> </mx:HBox> <mx:HBox> <mx:Label text="Email Address"/> <mx:TextInput id="emailaddress"/> </mx:HBox> <mx:Button label="Submit...