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Take a look at MyFaces Core source code, to know in detail how ExceptionHandler implementations works.

MyFaces ExceptionHandler

MyFaces Core provide a custom ExceptionHandler to deal with exceptions and provide detailed information about it. Since 2.0.8/2.1.2 this is disabled on Production environments unless it enabled on web.xml file. Don't forget to provide your custom error page in this scenario, to prevent show more information than necessary.

  <context-param>
    <param-name>org.apache.myfaces.ERROR_HANDLING</param-name>
    <param-value>true</param-value>
  </context-param>

  <!-- if you want to use a different resource template file than 
       "META-INF/rsc/myfaces-dev-error.xml" this param let you configure
       it. (since 1.2.4-SNAPSHOT and 1.1.6-SNAPSHOT)-->
  <context-param>
    <param-name>org.apache.myfaces.ERROR_TEMPLATE_RESOURCE</param-name>
    <param-value>META-INF/rsc/custom-dev-error.xml</param-value>
  </context-param>

Provide an error page

The default ExceptionHandler in Production stage or when myfaces error handling is disabled just throw an exception. So you can still setup an error page adding something like this in your web.xml file:

	<error-page>
		<error-code>500</error-code>
		<location>/somepage.jsp</location>
	</error-page>

Error handling for MyFaces Core 1.2 and earlier versions

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