我正在尝试将Portlet从Liferay 6.1迁移到Liferay 6.2 ga6。此portlet还具有Vaadin集成版本7.6.5。我收到了这个错误，我需要帮助找出如何继续：
....
at com.vaadin.ui.UI.doInit(UI.java:682)
at com.vaadin.server.communication.UIInitHandler.getBrowserDetailsUI(UIInitHandler.java:214)
at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:74)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1409)
at com.vaadin.server.VaadinPortlet.handleRequest(VaadinPortlet.java:544)
at com.vaadin.server.VaadinPortlet.serveResource(VaadinPortlet.java:626)
at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:122)
at com.liferay.portlet.ScriptDataPortletFilter.doFilter(ScriptDataPortletFilter.java:82)
at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:116)
at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:71)
at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:112)
......
我很感激任何帮助。
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