If I have 2 or more Vaadin portlets on a single page and then try to show the connector hierarchy tree using the debug panel, I get the following exception.
Exception caught: SimplePanel can only contain one child widgetcom.google.gwt.event.shared.UmbrellaException: Exception caught: SimplePanel can only contain one child widget
Please
create a ticket about this if you can reproduce the issue with the latest Vaadin versions, and indicate which Vaadin version exhibits the problem. Attaching a minimal test portlet and description on how it is used can also help resolve this, especially if not reproducible with the “Hello world!” portlet that the Eclipse plug-in generates.