GRAVE: Servlet.service() for servlet [it.igf.web.igf_web.Igf_webUI$Servlet] in context with path [/IGF-WEB] threw exception [com.vaadin.server.ServiceException: java.lang.ClassCastException: com.ejt.vaadin.loginform.shared.LoginFormState cannot be cast to com.vaadin.shared.ui.AbstractSingleComponentContainerState] with root cause
java.lang.ClassCastException: com.ejt.vaadin.loginform.shared.LoginFormState cannot be cast to com.vaadin.shared.ui.AbstractSingleComponentContainerState
	at com.vaadin.ui.AbstractSingleComponentContainer.getState(AbstractSingleComponentContainer.java:365)
	at com.vaadin.ui.AbstractSingleComponentContainer.getState(AbstractSingleComponentContainer.java:41)
	at com.vaadin.server.AbstractClientConnector.getState(AbstractClientConnector.java:243)
	at com.vaadin.ui.AbstractComponent.getState(AbstractComponent.java:700)
	at com.vaadin.ui.AbstractSingleComponentContainer.getState(AbstractSingleComponentContainer.java:359)
	at com.vaadin.ui.AbstractSingleComponentContainer.getState(AbstractSingleComponentContainer.java:41)
	at com.ejt.vaadin.loginform.LoginForm.getState(LoginForm.java:173)
	at com.ejt.vaadin.loginform.LoginForm.init(LoginForm.java:207)
	at com.ejt.vaadin.loginform.LoginForm.attach(LoginForm.java:179)
	at com.vaadin.ui.AbstractComponent.setParent(AbstractComponent.java:554)
	at com.vaadin.ui.AbstractComponentContainer.addComponent(AbstractComponentContainer.java:178)
	at com.vaadin.ui.AbstractOrderedLayout.addComponent(AbstractOrderedLayout.java:94)
	at it.igf.web.views.login.LoginView.enter(LoginView.java:126)
	at com.vaadin.navigator.Navigator.navigateTo(Navigator.java:615)
	at com.vaadin.navigator.Navigator.navigateTo(Navigator.java:574)
	at it.igf.web.igf_web.Igf_webUI.init(Igf_webUI.java:51)
	at com.vaadin.ui.UI.doInit(UI.java:738)
	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:1464)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:380)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)