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java.lang.UnsupportedOperationException: null	at javax.faces.context.ExternalContext.getClientWindow(ExternalContext.java:1500)	at com.sun.faces.context.ExternalContextImpl.encodeActionURL(ExternalContextImpl.java:562)	at org.springframework.faces.webflow.ExternalContextWrapper.encodeActionURL(ExternalContextWrapper.java:29)	at com.sun.faces.renderkit.html_basic.FormRenderer.getActionStr(FormRenderer.java:234)	at com.sun.faces.renderkit.html_basic.FormRenderer.encodeBegin(FormRenderer.java:134)	at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:864)	at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:68)	at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:58)	at org.primefaces.component.outputpanel.OutputPanelRenderer.encodeMarkup(OutputPanelRenderer.java:64)	at org.primefaces.component.outputpanel.OutputPanelRenderer.encodeEnd(OutputPanelRenderer.java:40)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1903)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:451)	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)	at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)	at org.springframework.faces.webflow.FlowLifecycle.render(FlowLifecycle.java:80)	at org.springframework.faces.webflow.JsfView.render(JsfView.java:89)	at org.springframework.webflow.engine.ViewState.render(ViewState.java:296)	at org.springframework.webflow.engine.ViewState.refresh(ViewState.java:243)	at org.springframework.webflow.engine.ViewState.resume(ViewState.java:221)	at org.springframework.webflow.engine.Flow.resume(Flow.java:545)	at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:258)	at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)	at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)	at org.springframework.faces.webflow.JsfFlowHandlerAdapter.handle(JsfFlowHandlerAdapter.java:48)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:178)	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:155)	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at de.hvbps.ewms.web.util.ResponseNoCacheFilter.doFilter(ResponseNoCacheFilter.java:55)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at de.hvbps.ewms.web.EwmsCsrfPreventionFilter.doFilter(EwmsCsrfPreventionFilter.java:273)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)