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How to debug Vaadin connection problems?
we are using Vaadin 7.4.2 with server push (long polling). We never had any trouble with the API or functionality of vaadin itself, but we often get strange "hickups" with the client-server-communication, such as:
- The client showing the message "Connection problem. Take note of any unsaved data, and click here or press ESC to continue"
- The client showing the vaadin loading indicator bar, which extends from left to right and starts blinking, but the loading process never finishes (the server is idle during this process)
- The server sending push messages that either never reach the client or are ignored by it (i.e. the client-side UI doesn't update)
My team and I would be very grateful for any advice on this.