Red Hat Summit Red Hat SummitSupportKonsoleEntwicklerDemo startenKontakt

Dieser Inhalt ist in der von Ihnen ausgewählten Sprache nicht verfügbar.

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
Nach oben
Red Hat logoGithubredditYoutubeTwitter

Lernen

Testen, kaufen und verkaufen

Communitys

Über Red Hat Dokumentation

Wir helfen Red Hat Benutzern, mit unseren Produkten und Diensten innovativ zu sein und ihre Ziele zu erreichen – mit Inhalten, denen sie vertrauen können. Entdecken Sie unsere neuesten Updates.

Mehr Inklusion in Open Source

Red Hat hat sich verpflichtet, problematische Sprache in unserem Code, unserer Dokumentation und unseren Web-Eigenschaften zu ersetzen. Weitere Einzelheiten finden Sie in Red Hat Blog.

Über Red Hat

Wir liefern gehärtete Lösungen, die es Unternehmen leichter machen, plattform- und umgebungsübergreifend zu arbeiten, vom zentralen Rechenzentrum bis zum Netzwerkrand.

Theme

© 2025 Red Hat