Error page locations allow a servlet to find and serve a URI to a client based on a specified error status code or exception type.
These properties are used if the error handler is another servlet or JSP file. The properties specify a mapping between an error code or exception type and the path of a resource in the web application (.war). The container examines the list in the order that it is defined, and attempts to match the error condition by status code or by exception class. On the first successful match of the error condition, the container serves back the resource defined in the Location property.
See AlsoWebapplications: Resources for learning