Re: Nested exceptions in SAX

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David Megginson wrote:
>> the proposed fix for this is simply to add
>>
>> public Throwable getCause() {
>>   return exception;
>> }
>>
>> to org.xml.sax.SAXException.
>>
>> I don't believe that this introduces any compatibility problems
>> (getCause() is already inherited from Throwable).
>
> I have no objection to this change -- we can batch it up with any
> other minor fixes and put out a maintenance release.  I have two
> questions for other SAX users:
>
> 1. Can you anticipate any problems this change might introduce?

It would silently break code that was using initCause but wasn't =20
using the constructor with exception, e.g.

   throw (SAXException) new SAXException(message).initCause=20
(originalException);

because the exception set by the programmer will then be ignored. =20
This is an issue with other APIs developed prior to 1.4, =20
MessagingException and ServletException for instance. Unfortunately, =20
because of the initCause contract and the fact that the cause =20
exception is private, it is not possible simply to call initCause in =20
the constructor with exception, since a subsequent call to initCause =20
(which would have been successful prior to this) will then raise =20
IllegalStateException.

> 2. Are there other similar, minor problems you'd like to see addressed
> in a maintenance release?

Now you come to mention it, there is

   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D23342
--=20
=E7=8A=AC Chris Burdess
   "They that can give up essential liberty to obtain a little safety
   deserve neither liberty nor safety." - Benjamin Franklin





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