Stream.cumulate issue

[Paul Sandoz]

Hi,

Thanks for reporting.

It's another one of those null tolerence bugs. 

I know what's causing it, null is used to mean no result, as there are cases when the leaf nodes has no values to process.

Paul.

On Dec 4, 2012, at 4:24 PM, Georgiy Rakov <georgiy.rakov at oracle.com> wrote:

> Hello,
> 
> cumulate().toArray() seems not to work properly with nulls. Consider following code:
> 
>   import java.util.Arrays;
>   import java.util.stream.Stream;
> 
>   public class CumulateIssue {
>        public static void main(String [] argv) {
>            Stream<Object> stream = Arrays.parallel(new Object[]{null,
>   null, null, null}).cumulate((a, b)->3);
>            System.out.println(Arrays.toString(stream.toArray()));
>        }
>   }
> 
> 
> It obviously should output:
> 
>   [null, 3, 3, 3]
> 
> But instead it outputs:
> 
>   [null, null, null, null]
> 
> I could suppose it's a bug. Please confirm if it is.
> 
> I use nightly build of November 5.
> 
> The code is attached for your convenience.
> 
> Thanks,
> Georgiy.
> <CumulateIssue.java>