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javax.faces.FacesException: java.lang.UnsupportedOperationException at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:310) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144) at com.icesoft.faces.webapp.http.core.JsfLifecycleExecutor.apply(JsfLifecycleExecutor.java:18) at com.icesoft.faces.webapp.http.core.PageServer$1.respond(PageServer.java:25) at com.icesoft.faces.webapp.http.servlet.ServletRequestResponse.respondWith(ServletRequestResponse.java:161) at com.icesoft.faces.webapp.http.servlet.ThreadBlockingAdaptingServlet$ThreadBlockingRequestResponse.respondWith(ThreadBlockingAdaptingServlet.java:36) at com.icesoft.faces.webapp.http.core.PageServer.service(PageServer.java:30) at com.icesoft.faces.webapp.http.core.SingleViewServer.service(SingleViewServer.java:48) at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer$Matcher.serviceOnMatch(PathDispatcherServer.java:50) at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer.service(PathDispatcherServer.java:19) at com.icesoft.faces.webapp.http.servlet.ThreadBlockingAdaptingServlet.service(ThreadBlockingAdaptingServlet.java:19) at com.icesoft.faces.webapp.http.servlet.EnvironmentAdaptingServlet.service(EnvironmentAdaptingServlet.java:63) at com.icesoft.faces.webapp.http.servlet.MainSessionBoundServlet.service(MainSessionBoundServlet.java:139) at com.icesoft.faces.webapp.http.servlet.SessionDispatcher.service(SessionDispatcher.java:53) at com.icesoft.faces.webapp.http.servlet.PathDispatcher$Matcher.serviceOnMatch(PathDispatcher.java:52) at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:29) at com.icesoft.faces.webapp.http.servlet.MainServlet.service(MainServlet.java:82) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Unknown Source)Caused by: java.lang.UnsupportedOperationException at javax.faces.context.ExternalContext.getResponseContentType(ExternalContext.java:749) at com.sun.faces.renderkit.RenderKitImpl.createResponseWriter(RenderKitImpl.java:183) at com.sun.facelets.FaceletViewHandler.createResponseWriter(FaceletViewHandler.java:380) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:550) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106) at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251) ... 29 more