Oracle JDeveloper 11.1.1.4 contains a new session time-out warning functionality.

Quoting the Oracle® Fusion Middleware Web User Interface Developer's Guide for Oracle Application Development Framework11g Release 1 (11.1.1.4.0) documentatiom

http://download.oracle.com/docs/cd/E17904_01/web.1111/b31973/ap_config.htm#BABFIGBA

"When a request is sent to the server, a session timeout value is written to the page and the session timeout warning interval is defined by the context parameter

 oracle.adf.view.rich.sessionHandling.WARNING_BEFORE_TIMEOUT.

The user is given the opportunity to extend the session in a warning dialog, and a notification is sent when the session has expired and the page is refreshed. Depending on the application security configuration, the user may be redirected to the log in page when the session expires.

Use the oracle.adf.view.rich.sessionHandling.WARNING_BEFORE_TIMEOUT context parameter to set the number of seconds prior to the session time out when a warning dialog is displayed. If the value of WARNING_BEFORE_TIMEOUT is less than 120 seconds, if client state saving is used for the page, or if the session has been invalidated, the feature is disabled. The session time-out value it taken directly from the session.

Example A-3 shows configuration of the warning dialog to display at 120 seconds before the time-out of the session.

Example A-3 Configuration of Session Time-out Warning

<context-param>
   <param-name>
        oracle.adf.view.rich.sessionHandling.WARNING_BEFORE_TIMEOUT
   </param-name>
   <param-value>120</param-value>
</context-param>

The default value of this parameter is 120 seconds. To prevent notification of the user too frequently when the session time-out is set too short, the actual value of WARNING_BEFORE_TIMEOUT is determined dynamically, where the session time-out must be more than 2 minutes or the feature is disabled.