To configure idempotent URL response, specify the URLs that can be safely retried in idempotent-url-pattern elements in the sun-web.xml file. For example:
<idempotent-url-pattern url-pattern="sun_java/*" no-of-retries="10"/>
For details, see idempotent-url-pattern in Sun Java System Application Server 9.1 Application Deployment Guide.
If none of the server instances can successfully serve the request, an error page is returned.