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Jetty/Howto/Custom Error Pages
Contents
Introduction
There are three ways to create custom error pages that are described below.
Define error pages in 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-type 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:
<error-page> <error-code>404</error-code> <location>/jspsnoop/ERROR/404</location> </error-page>
Exception example:
<error-page> <exception-type>java.io.IOException</exception-type> <location>/jspsnoop/IOException</location> </error-page>
Context file configuration
Context files are normally located in <jetty.home>/contexts/ (see Jetty/Feature/ContextDeployer for more details). 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:
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://jetty.mortbay.org/configure.dtd"> <Configure class="org.mortbay.jetty.webapp.WebAppContext"> <Set name="contextPath">/test</Set> <Set name="war"> <SystemProperty name="jetty.home" default="."/>/webapps/test </Set> <!-- by Code --> <Get name="errorHandler"> <Call name="addErrorPage"> <Arg type="int">404</Arg> <Arg type="String">/jspsnoop/ERROR/404</Arg> </Call> </Get> <!-- by Exception --> <Get name="errorHandler"> <Call name="addErrorPage"> <Arg type="java.lang.Class">java.io.IOException</Arg> <Arg type="String">/jspsnoop/IOException</Arg> </Call> </Get> <!-- by Code Range --> <Get name="errorHandler"> <Call name="addErrorPage"> <Arg type="int">500</Arg> <Arg type="int">599</Arg> <Arg type="String">/dump/errorCodeRangeMapping</Arg> </Call> </Get> </Configure>
h2. 3. Custom error handle class.
A context may be configured with a custom error handler class that extends [ErrorHandler
Tips, Hints, and Warnings
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Examples
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Snippets and Screenshots
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Additional Resources
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