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From "Jimmy, Jing Lv" <firep...@gmail.com>
Subject Re: [classlib] Exception throwing compatibility
Date Fri, 12 May 2006 02:25:38 GMT
 > Mikhail Fursov wrote:
> I agree that the easiest way for us is to throw RI or subclass.

+1.

> 
> Is it 'bad' practice to fix this "bug" (replace subclass with RI)  on user
> request and do not think about this problem today?
> 

In this case, though replace StringIndexOutOfBoundsException with 
ArrayIndexOutOfBoundsException is surely better, it seems it is internal 
  implementation what cause the problem. According to the code it use 
String.valueof(str), which writes:
try {
	System.arraycopy(data, start, value, 0, count);
} catch (IndexOutOfBoundsException e) {
	throw new StringIndexOutOfBoundsException();
}
Is it right to StringIndexOutOfBoundsException in String.valueof()? Then 
to fix this, we shall write another
try{ ...
}catch(StringIndexOutOfBoundsException){
	throw new ArrayIndexOutOfBoundsException();
}
It is not so beautiful...

However according to
http://incubator.apache.org/harmony/subcomponents/classlibrary/compat.html
it has already draw a conclusion that:
1) throw according to spec
2) when we discover RI throw difference exception which is not internal 
class, follow RI.

What real matters is how can developers know what RI throws exactly in 
all situations? Maybe a possible solution is that we fix one by one only 
when we find the difference.

> On 5/11/06, Richard Liang <richard.liangyx@gmail.com> wrote:
>>
>> George Harley wrote:
>> > Hi,
>> >
>> > I would like to start a little discussion around JIRA issue 436 [1]
>> > which deals with exception throwing compatibility between Harmony and
>> > the RI. I feel it is important to reach a concrete agreement on this
>> > as so far all of the participants in the issue seem to disagree about
>> > the interpretation of the compatibility guidelines on our web site [2].
>> >
>> > You can read the discussion for yourself on the JIRA page (it is only
>> > a handful of comments) but if you are pressed for time the essentials
>> > are this (IMHO - Nathan and Dmitry please feel free to fill in the
>> > gaps) :
>> >
>> > * Currently the Harmony implementation of a few public methods in
>> > StringBuffer and StringBuilder throw different runtime exceptions from
>> > the RI under certain failure scenarios.
>> >
>> > * Where the Javadoc mentions the exception type that ought to be
>> > thrown it mentions a type (j.l.IndexOutOfBoundsException) but the
>> > Harmony and RI implementations differ in that they are throwing
>> > different *sub-types* of j.l.IndexOutOfBoundsException. The RI tends
>> > to throw j.l.ArrayIndexOutOfBoundsException while Harmony tends to
>> > throw j.l.StringIndexOutOfBoundsException.
>> >
>> > * Dmitry (who raised the issue) believes that we should change the
>> > Harmony code to throw the type named in the Javadoc/specification
>> > (i.e. the supertype j.l.IndexOutOfBoundsException).
>> >
>> > * Nathan believes that the code already abides by the specification
>> > and that there is no need for any change in this area.
>> >
>> > * Little old me thinks that there *is* a problem here but that the
>> > solution is to do as the RI does and throw exceptions with the very
>> > same runtime type as the RI. That's based on my interpretation of the
>> > exception-throwing compatibility guidelines [2], in particular the
>> > fragment "Harmony class library code should throw exceptions of the
>> > same type as the RI".
>> >
>> >
>> > If I recall correctly we did agree to discuss such compatibility
>> > matters on a case-by-case basis. So, dear reader, what do you think is
>> > the correct course of action in this case ?
>> >
>> > Best regards,
>> > George
>> >
>> >
>> > [1] http://issues.apache.org/jira/browse/HARMONY-436
>> > [2]
>> >
>> http://incubator.apache.org/harmony/subcomponents/classlibrary/compat.html 
>>
>> >
>> >
>> > ---------------------------------------------------------------------
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>> >
>> >
>> Hello,
>>
>> Let me support Mikhail "we should throw either what RI throws or a
>> sub-class".
>>
>> -- 
>> Richard Liang
>> China Software Development Lab, IBM
>>
>>
>>
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>>
>>
> 


-- 

Best Regards!

Jimmy, Jing Lv
China Software Development Lab, IBM

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