<error-page>
    <exception-type>javax.faces.application.ViewExpiredException</exception-type>
    <location>sessionex.xhtml</location>
</error-page>

<error-page>
    <error-code>500</error-code>
    <location>onerror.xhtml</location>
</error-page>

2018-12-12 18:11:58,934 ERROR [io.undertow.request] (default task-1) UT005023: Exception handling request to /foobar/index.xhtml: javax.servlet.ServletException: viewId:/index.xhtml - ...
           at javax.faces.api//javax.faces.webapp.FacesServlet.service(FacesServlet.java:683)
...
Caused by: javax.faces.application.ViewExpiredException: viewId:/index.xhtml - ...
           at com.sun.jsf-impl//com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:218)
           at com.sun.jsf-impl//com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
           at com.sun.jsf-impl//com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:133)
           at com.sun.jsf-impl//com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:201)
           at javax.faces.api//javax.faces.webapp.FacesServlet.service(FacesServlet.java:670)
   ...

<error-page>
    <exception-type>javax.servlet.ServletException</exception-type>
    <location>onerror.xhtml</location>
</error-page>