When I run my GWT 2.7.0 app in Eclipse, all is fine.
I compile the app Right click on project > Google > GWT Compile. I build my war. Copy the war in the webapps directory.
I get the first page ok (static HTML), then when I click on the app, after some time, I get a message box that says:
The page at xxx:8081 says:
Couldn't load app from Super Dev Mode
server at http://xxx:9876.
Please make sure this server is ready.
Do you want to try again?