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Re: Ternary op + autoboxing + null value = NPE?
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Re: Ternary op + autoboxing + null value = NPE?


  • Subject: Re: Ternary op + autoboxing + null value = NPE?
  • From: Mike Schrag <email@hidden>
  • Date: Mon, 19 Oct 2009 11:37:34 -0400

The two values on either side of the colon have to be of the same type, so I suspect it's boxing the first one from Double down to double (and NPEing) then boxing back up to Double at the end? I put this in the "just don't do that" category. I personally don't like boxing -- I think it's very misleading and leads to weird bugs like this.

On Oct 19, 2009, at 11:31 AM, Ramsey Gurley wrote:

Hi all,

I've just discovered that while

Double test = true?null:0d; //result: test is null

works without error, the following

Double test2 = true?(new Object(){public Double testMethod(){return null;}}.testMethod()):0d; //<-Throws NPE

Throws a NullPointerException. :-/ Ok, that sucks, so what about this?

Double test3 = new Object(){public Double testMethod2(){return null;}}.testMethod2(); // result: test3 is null
Double test4 = true?test3:0d; //<-Throws NPE


Also throws a NullPointerException. I suspect this has something to do with the autoboxing, because

Object test5 = true?new Object(){public Object testMethod3(){return null;}}.testMethod3():0d;

Works fine. I'm running OS X 10.5 and java 1.5 here at work. Is this a known issue? Or is this somehow expected behavior?

Ramsey


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  • Follow-Ups:
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References: 
 >Ternary op + autoboxing + null value = NPE? (From: Ramsey Gurley <email@hidden>)

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