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A http status response that is sent to the consumer if an error occurs.

Tries to execute a function and discards any error that occurs

A module to log when a user logs in or logs out, or when a user session timeout occurs.

The Crash Handler module intercepts uncaught exceptions, empowering you to execute desired actions before a crash occurs.

An Servlet Filter authenticating the user if a security exception occurs and executes the following handling chain as the authenticated user. Significant portions of the code are ported from apache clerezza platform.security.

Avalon Excalibur's resource management code allows you to be notified when a resource has changed. There are two methods of resource management: active and passive. Passive resource management acts as a holder for resources, and after the resource has been modified through it's normal API, notification goes to all listeners. Active resource management does the same, but it also polls the resources periodically to see if the resource was modified through an external method. Active resource management is perfect for monitoring files because they can be modified by external programs, and your program will be notified when the change occurs instead of constantly polling it.