Groups > comp.lang.java.programmer > #16088

Re: throw null investigation

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From	Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: throw null investigation
Date	Wed, 18 Jul 2012 23:33:52 +0200
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On 18/07/2012 22:35, markspace allegedly wrote:
> On 7/18/2012 12:39 PM, Daniel Pitts wrote:
>> On 7/18/12 10:10 AM, bob smith wrote:
>>> Is it common practice to throw a null exception when writing JNI code?
>>>
>>> I'm seeing an exception that is simply a null rather than an object,
>>> and I'm wondering if it's because it's easier to do that in JNI.
>>>
>>  From what I can tell, that shouldn't ever happen. I'm not sure in JNI,
>> but I know in Java if you throw a "null", it will instead throw a
>> NullPointerException, so anyone catching that Throwable will not see a
>> "null" value, but instead a NullPointerException instance.
>>
> 
> 
> In Java, yes.  But in JNI, in C, I'd expect it is possible to literally
> throw an empty or null pointer.
> 
> I'd also expect that any code that did that was sub-par, and not worth
> using or debugging.
> 
> I'm mildly interested in what the OP is using, mostly so I can avoid it.
>  However if he can supply some details (*what* are you using, Bob?) I'd
> consider taking a loot at it.  The actually question he asks: "Is it
> common practice," I don't really know or care.  It seems bad practice,
> but I've never dealt with JNI code, so what do I know?
> 

But if the JNI code actually wanted to throw an NPE, and teh Jav wraps a
null into an NPE, wouldn't it actually be more efficient if the JNI code
"threw" a null?

-- 
DF.

Thread

throw null investigation bob smith <bob@coolfone.comze.com> - 2012-07-18 10:10 -0700
  Re: throw null investigation Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-07-18 12:39 -0700
    Re: throw null investigation markspace <-@.> - 2012-07-18 13:35 -0700
      Re: throw null investigation Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-07-18 23:33 +0200
        Re: throw null investigation markspace <-@.> - 2012-07-18 14:43 -0700
          Re: throw null investigation Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-07-19 00:06 +0200
            Re: throw null investigation markspace <-@.> - 2012-07-18 15:55 -0700
              Re: throw null investigation Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-07-18 16:00 -0700
                Re: throw null investigation Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-07-18 16:16 -0700
  Re: throw null investigation Roedy Green <see_website@mindprod.com.invalid> - 2012-07-18 17:09 -0700

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