We have been getting this error starting about a week ago and we get it every few days. A stop/start of the apache-tomcat process clears the error. Google searches on this particular error don't yield any results that I can understand. The on screen error is below: HTTP Status 500 - invalid stream header: 39855091 type Exception report message invalid stream header: 39855091 description The server encountered an internal error that prevented it from fulfilling this request. exception java.io.StreamCorruptedException: invalid stream header: 39855091 java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:807) java.io.ObjectInputStream.<init>(ObjectInputStream.java:302) com.sun.faces.renderkit.ApplicationObjectInputStream.<init>(ApplicationObjectInputStream.java:81) com.sun.faces.spi.SerializationProviderFactory$JavaSerializationProvider.createObjectInputStream(SerializationProviderFactory.java:211) com.sun.faces.renderkit.ResponseStateManagerImpl.getTreeStructureToRestore(ResponseStateManagerImpl.java:170) javax.faces.render.ResponseStateManager.getState(ResponseStateManager.java:226) com.sun.faces.application.StateManagerImpl.restoreTree(StateManagerImpl.java:650) com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:131) org.jboss.seam.jsf.SeamStateManager.restoreView(SeamStateManager.java:76) com.sun.faces.application.ViewHandlerImpl.restoreView(ViewHandlerImpl.java:311) org.jboss.seam.jsf.SeamViewHandler.restoreView(SeamViewHandler.java:93) com.sun.facelets.FaceletViewHandler.restoreView(FaceletViewHandler.java:317) com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:175) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:103) com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) javax.faces.webapp.FacesServlet.service(FacesServlet.java:265) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.jboss.seam.web.RewriteFilter.process(RewriteFilter.java:98) org.jboss.seam.web.RewriteFilter.doFilter(RewriteFilter.java:57) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73) org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.55 logs. Apache Tomcat/7.0.55