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At 12:47 PM -0500 3/5/04, Karl Waclawek wrote:
>The question is: why can the exception argument passed to fataError()
>wrap another exeption then?
Because it's sometimes useful to do so. For instance, the parser
might detect a well-formedness error when Reader.read throws a
CharacterConversionException. It could then stick this exception into
the exception field of the SAXException, so it could be further
inspected, in a debugger for example. The goal here is to provide
additional information about the cause of one exceptional condition,
not to chain together a bunch of exceptions that each represent a
different error in the same document.
In Java 1.4 all exceptions, in fact all throwables, can have nested
exceptions. This is a general pattern that makes debugging easier. It
is not meant stuff several exceptional conditions into one object.
Instead it is meant to provide different views of a single
exceptional condition.
--
Elliotte Rusty Harold
elharo@metalab.unc.edu
Effective XML (Addison-Wesley, 2003)
http://www.cafeconleche.org/books/effectivexml
http://www.amazon.com/exec/obidos/ISBN%3D0321150406/ref%3Dnosim/cafeaulaitA
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