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   Re: SAX: Exception Handling

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  • From: David.Brownell@Eng.Sun.COM (David Brownell)
  • To: ak117@freenet.carleton.ca, jjc@jclark.com
  • Date: Mon, 4 May 1998 08:56:26 -0700

> >    throws java.lang.Exception
> >  {
> >    [..]
> >  }
> > 
> > The Java compiler will not help me discover which constructors or
> > methods invoked in the body can throw exceptions that I have not yet
> > considered.
> Right, so don't do that.  Declaring an *interface* as throws
> java.lang.Exception does not constrain an *implementation* of that
> interface to be declared as throws java.lang.Exception.  It can be
> declared to throw the appropriate subclass of java.lang.Exception.

But then since application programmers write to interfaces, not
implementations, then application programmers would have all those
nasty problems with getting handed random exceptions.

A primary intent of exception declarations is to constrain the
kinds of errors that a substystem (e.g. parser) reports, so that
its clients have a clean "contract" and know exactly the kinds of
"expected faults" they have to deal with.

Clauses like "throws Exception" are basically counter to the core
philosophy of exceptions in Java.

- Dave

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