3 ways in creating custom error pages

1. web.xml

The standard webapp configuration file located in <webapp>/WEB-INF/web.xml can be used to map errors to specific URLs with the <error-page> element. This element creates a mapping between the error-code or exception typ to the location of a resource in the web application.

• error-code - integer value
• exception-type - fully qualified class name of a Java Exception type
• location - location of the resource in webapp relative to the root of the web application. Value should start with "/".

Error code example:

Exception example:

2. context file configuration.

Context files are nomrall located in <jetty.home>/contexts/?.xml (see ContextDeployer for more detail). Context files
can be used to configure the default error handler provided for a context with more flexibility than is available with web.xml,
specifically with the support of error code ranges:

3. Custom error handle class.

A context may be configured with a custom error handler class that extends ErrorHandler (for webapp contexts
it must extend ErrorPageErrorHandler).

The following methods may be implemented to control the appearance of the error pages:

• public void handle(String target, HttpServletRequest request, HttpServletResponse response, int dispatch) throws IOException
• void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message) throws IOException
• void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks) throws IOException
• void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message) throws IOException
• void writeErrorPageBody(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks) throws IOException
• void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri) throws IOException
• void writeErrorPageStacks(HttpServletRequest request, Writer writer) throws IOException

The custom error handler may be set on the context via the API or via a context configuration file. For example a custom error handling class can be added to the javadoc context with: