Andrey Stepachev created HBASE-12970:
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             Summary: Annotate methods and parameters with @Nullable/@Nonnull
                 Key: HBASE-12970
                 URL: https://issues.apache.org/jira/browse/HBASE-12970
             Project: HBase
          Issue Type: Improvement
            Reporter: Andrey Stepachev
            Priority: Minor


We have many bugs with NPE. But current IDE allows us to see that null is 
possible as return value. findbugs can handle that too.
So we need to:
1. annotate methods with null/nonnull
2. force annotation of interfaces (and even better - classes) with 
@Nullable/@Nonnull annotations



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