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    javax.servlet.ServletException: com.vaadin.server.ServiceException: java.lang.NullPointerException
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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at com.vaadin.server.communication.UIInitHandler.getBrowserDetailsUI()
    2. com.vaadin.server
      VaadinService.handleRequest
      1. com.vaadin.server.communication.UIInitHandler.getBrowserDetailsUI(UIInitHandler.java:194)
      2. com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:74)
      3. com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
      4. com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1408)
      4 frames