GWT widget issue

General
1

Hello

I am implementing GWT Widget (using Vaadin 6) to implement google wallet in my web app using wallet Javascript Library. Actually I need to ask about
ApplicationConnection.updateVariable()
 method, I want to update my variable at server-side whenever I got the result from Javascript (whenever google’s payment API calls a confirmation method in my script).
When i recieved the confirmation from google, I call my widget’s


client.updateVariable(paintableId, “paymentStatus”, paymentStatus, true)
;(paymentStatus is a string)

with immediate parameter
true
.

The problem I am facing is that after completing one cycle of purchase and then calling the above method my server-side method
changeVariables()
didn’t get triggered, unless I click any other component or do somthing which makes a server call or again hit the wallet button.

I was expecting that after calling the above mentioned method I got into the server-side component ,I set a breakpoint at
CommunicationManager.handleUidlRequest()
which is not triggered after updateVariable() call.

May be I am not getting the way the
updateVariable()
 method works. Any explanation regarding this method or any way out to this issue is appreciated.
Cheers

2

If you give the value “true” for the immediate parameter, you should get a call to changeVariables() on the server side - the symptoms you describe I would normally associate with not having the immediate parameter set. I also assume that paymentStatus is of a simple data type (although that should not have any relevance here).

Please check the implementation of the client.updateVariable() method you are calling. Use DevMode to put a breakpoint there and check if the update is skipped for some reason.

3

@Henri Sara :

Thanks alot for your kind reply, using DevMode I figure out that the variable I was sending (i.e. paymentStatus) found to be null and hence thrown into the NullPointerException rather going into server-side code.