[Java] fix master build failure caused by ErrorProne

[asfimport]

Reporter: Pindikura Ravindra / @pravindra
Assignee: Ji Liu / @tianchen92

PRs and other links:

• GitHub Pull Request #5327

_{Note: This issue was originally created as ARROW-6491. Please see the migration documentation for further details.}

[asfimport]

Pindikura Ravindra / @pravindra:
Issue resolved by pull request 5327
#5327