Comments on: DZone Podcast about Adobe AIR, Flex, and Java

By: James Ward

James Ward — Mon, 06 Jul 2009 18:41:47 +0000

Hi Joy,

I think that remoteable classes must have a no-arg constructor unless perhaps if you are using the Spring BlazeDS Integration. In which case I think you can inject stuff in but that stuff still can’t be passed in from the client. You could consider setting your remoting destinations to use the session scope. I hope that helps.

-James

By: Joy

Joy — Mon, 06 Jul 2009 14:27:13 +0000

James,
I have been palying with BlazeDs and Java for almost 3 months now, but one curious question popped up just now.
In remoting-config.xml we always declare destination of java class and it invokes this class having a default contructor.
What if i want to invoke a constructor with argument???
e.g public class MyClass {
public MyClass() {} // Default constructor
public MyClass(String myArg){
attr = myArg ;
}
What if i want to pass this “myArg” from Flex? What is the better way to handle this?
Will appreciate your response on this.

By: James Ward

James Ward — Thu, 11 Jun 2009 18:15:28 +0000

Hi Amar,

Make sure that when setting up the project you specify the information for the J2EE server.

-James

By: amar

amar — Thu, 11 Jun 2009 06:06:48 +0000

i tried your refcard at DZONE “first steps in flex” and the small apps UsingHTTPService and testChat didn’t work . The GUI worked but didn’t function. Gave a lots of errors:
When tried to run testChat, it opened in browser but before the error came like this (even later, typed message didn’t show in the text area abobe”:
[MessagingError message='Destination 'chat' either does not exist or the destination has no channels defined (and the application does not define any default channels.)']
at mx.messaging.config::ServerConfig$/internalGetChannelSet()[E:\dev\3.0.x\frameworks\projects\rpc\src\mx\messaging\config\ServerConfig.as:624]
at mx.messaging.config::ServerConfig$/getChannelSet()[E:\dev\3.0.x\frameworks\projects\rpc\src\mx\messaging\config\ServerConfig.as:255]
at mx.messaging::MessageAgent/initChannelSet()[E:\dev\3.0.x\frameworks\projects\rpc\src\mx\messaging\MessageAgent.as:1083]
at mx.messaging::MessageAgent/internalSend()[E:\dev\3.0.x\frameworks\projects\rpc\src\mx\messaging\MessageAgent.as:1059]
at mx.messaging::Consumer/internalSend()[E:\dev\3.0.x\frameworks\projects\rpc\src\mx\messaging\Consumer.as:224]
at mx.messaging::AbstractConsumer/subscribe()[E:\dev\3.0.x\frameworks\projects\rpc\src\mx\messaging\AbstractConsumer.as:624]
at testChat/___testChat_Application1_creationComplete()[C:\Documents and Settings\Amarendra Kumar\My Documents\Flex Builder 3\testChat\src\testChat.mxml:3]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\core\UIComponent.as:9051]