Wes McKinney created ARROW-398:

             Summary: [Java] Java file format requires bitmaps of all 1's to be 
written when there are no nulls
                 Key: ARROW-398
                 URL: https://issues.apache.org/jira/browse/ARROW-398
             Project: Apache Arrow
          Issue Type: Bug
          Components: Java - Vectors
            Reporter: Wes McKinney
            Priority: Blocker

>From the format specification "Arrays having a 0 null count may choose to not 
>allocate the null bitmap. Implementations may choose to always allocate one 
>anyway as a matter of convenience, but this should be noted when memory is 
>being shared."

When the null count is 0 and the validity buffer has length 0, then in Java for 
now the simplest thing will be to allocate a new validity buffer with all 1's. 
See the corresponding C++ logic where a 0-length buffer is being written when 
the null count is 0: 

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