JSF 2 Error Page
Last Updated on Wednesday, 01 June 2011 18:32
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JSF 
2 Error Page
If no <error-page> elements are declared in the web application deployment descriptor, the runtime must provide a
default error page that contains the following information.
- The stack trace of the Exception
- The UIComponent tree at the time the ExceptionEvent was handled.
- All scoped variables in request, view, session and application scope.
- If the error happens during the execution of the view declaration language page (VDL)
- The physical file being traversed at the time the Exception was thrown, such as /user.xhtml
- The line number within that physical file at the time the Exception was thrown
- Any available error message(s) from the VDL page, such as: "The prefix "ubiteck" for element "ubiteck:inputBox" is not bound."
- The viewId at the time the ExceptionEvent was handled
Source : JSF specs 2.0