Red Hat Summit Red Hat SummitApoyoConsolaDesarrolladoresIniciar una pruebaContacto

Este contenido no está disponible en el idioma seleccionado.

8.12.2. Dealing with errors

However carefully your application is designed to queue concurrent requests to your conversational component, there is a risk that the server will overload. When overload occurs, not all requests will be processed before the concurrent-request-timeout period expires. In this case, Seam throws a ConcurrentRequestTimeoutException, which is handled in pages.xml. We recommend sending a HTTP 503 error: 
<exception class="org.jboss.seam.ConcurrentRequestTimeoutException" 
           log-level="trace"> 
  <http-error error-code="503" /> 
</exception>
Copy to Clipboard Toggle word wrap

Note

The server is currently unable to handle the request due to a temporary overloading or maintenance of the server. The implication is that this is a temporary condition which will be alleviated after some delay.
Alternatively you could redirect to an error page: 
<exception class="org.jboss.seam.ConcurrentRequestTimeoutException" 
           log-level="trace"> 
  <end-conversation/> 
  <redirect view-id="/error.xhtml"> 
    <message>
      The server is too busy to process your request, 
      please try again later
    </message> 
  </redirect> 
</exception>
Copy to Clipboard Toggle word wrap
ICEfaces, RichFaces AJAX and Seam Remoting can all handle HTTP error codes. Seam Remoting will pop up a dialog box showing the HTTP error. ICEfaces will indicate the error in its connection status component. RichFaces provides the most complete support for handling HTTP errors by providing a user definable callback. For example, to show the error message to the user: 
<script type="text/javascript"> 
  A4J.AJAX.onError = function(req,status,message) { 
    alert("An error occurred"); 
  }; 
</script>
Copy to Clipboard Toggle word wrap
If, rather than an error code, the server reports that the view has expired, perhaps because a session timed out, use a separate callback function in RichFaces: 
<script type="text/javascript"> 
  A4J.AJAX.onExpired = function(loc,message) { 
    alert("View expired"); 
  }; 
</script>
Copy to Clipboard Toggle word wrap
Alternatively, you can allow RichFaces to handle the error. In this case, the user will receive a prompt reading, "View state could not be restored — reload page?" This message can be globally customized by setting the following message key in an application resource bundle: 
AJAX_VIEW_EXPIRED=View expired. Please reload the page.
Copy to Clipboard Toggle word wrap
Volver arriba
Red Hat logoGithubredditYoutubeTwitter

Aprender

Pruebe, compre y venda

Comunidades

Acerca de la documentación de Red Hat

Ayudamos a los usuarios de Red Hat a innovar y alcanzar sus objetivos con nuestros productos y servicios con contenido en el que pueden confiar. Explore nuestras recientes actualizaciones.

Hacer que el código abierto sea más inclusivo

Red Hat se compromete a reemplazar el lenguaje problemático en nuestro código, documentación y propiedades web. Para más detalles, consulte el Blog de Red Hat.

Acerca de Red Hat

Ofrecemos soluciones reforzadas que facilitan a las empresas trabajar en plataformas y entornos, desde el centro de datos central hasta el perímetro de la red.

Theme

© 2025 Red Hat