AFAIK "accidental" NPEs don't have a message associated with them.
So provided that the assertion generates the NPE with a suitable
message (e.g.as currently done for the IAE) then it *should* be
possible for the end user to distinguish the two cases.
I am slightly in favour of retaining IAE as the cause is obvious with
needing to look at the NPE message.
==
Horrible hack: - if you want to use NPE, you could wrap an IAE in the NPE:
npe = new NPE(msg);
npe.initCause(new IAE(msg));
throw npe;
Or vice-vera, of course!
Not sure that gains anything, but it does make the stack trace look
more impressive!
On 30 August 2013 13:42, James Carman <ja...@carmanconsulting.com> wrote:
> Commons Lang's Validate.notNull() throws NPEs. I don't know that I've
> necessarily agreed with that, but at some point a decision was made
> that null constraint violations should throw NPEs. Food for thought.
>
> On Fri, Aug 30, 2013 at 8:32 AM, Gary Gregory <garydgreg...@gmail.com> wrote:
>> On Fri, Aug 30, 2013 at 8:25 AM, Emmanuel Bourg <ebo...@apache.org> wrote:
>>
>>>
>>> >> + if (parameter == null) {
>>> >> + throw new IllegalArgumentException("Parameter '" +
>>> parameterName + "' must not be null!");
>>> >> + }
>>> >> + }
>>> >> +}
>>>
>>> Isn't a null value supposed to throw a NPE ?
>>>
>>
>> Not always IMO. When I see an NPE I assume something is very wrong and that
>> it could be a bug in the impl OR a call site, somewhere on the code path.
>>
>> With an IAE, I know for sure it's a problem in the call site (which could
>> be a bug of course).
>>
>> I does not help that the JRE/JDK is inconsistent, so it's hard to find
>> examples.
>>
>> Gary
>>
>>
>>> Emmanuel Bourg
>>>
>>>
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>>
>>
>> --
>> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org
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>> Edition<http://www.manning.com/bauer3/>
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