Vaadin: IllegalStateException “UI id has already been defined' after session timeout”
Question
My Vaadin application throws following exception after session timeout and page refresh attempt.
java.lang.IllegalStateException: UI id has already been defined
at com.vaadin.ui.UI.doInit(UI.java:519)
at com.vaadin.server.AbstractCommunicationManager.getBrowserDetailsUI(AbstractCommunicationManager.java:2468)
at com.vaadin.server.AbstractCommunicationManager.handleBrowserDetailsRequest(AbstractCommunicationManager.java:2362)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:325)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:201)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)...I would appreciate any thoughts on what this means and why happens.
2 answers
solution1
0 2013-09-18 07:08:07
This code removes problem for me
@PreserveOnRefresh
public class MyVaadinUI extends UI {
...
solution2
0 ACCPTED 2013-09-18 09:28:37
In my case the reason of that exception was this Spring integration plugin. I guess it was managing UI instances as singletones. We decided to use manual Spring context creation. That solved the problem.
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