Missing a Javadoc comment.

WhitespaceAround: '->' is not preceded with whitespace.

WhitespaceAround: '->' is not preceded with whitespace.

WhitespaceAround: '->' is not preceded with whitespace.

Extra separation in import group before 'java.io.IOException'

Wrong lexicographical order for 'java.io.IOException' import. Should be before 'org.mockito.Mockito'.

Wrong lexicographical order for 'java.nio.charset.StandardCharsets' import. Should be before 'org.mockito.Mockito'.

Wrong lexicographical order for 'java.util.Base64' import. Should be before 'org.mockito.Mockito'.

Wrong lexicographical order for 'java.util.Optional' import. Should be before 'org.mockito.Mockito'.

'(' is followed by whitespace.

Distance between variable 'ca' declaration and its first usage is 11, but allowed 3.  Consider making that variable final if you still need to store its value in advance (before method calls that might have side effects on the original value).

Abbreviation in name 'runDynamicPartitionerMR' must contain no more than '1' consecutive capital letters.

Abbreviation in name 'runDynamicPartitionerMR' must contain no more than '1' consecutive capital letters.

Distance between variable 'app' declaration and its first usage is 7, but allowed 3.  Consider making that variable final if you still need to store its value in advance (before method calls that might have side effects on the original value).

First sentence of Javadoc is missing an ending period.

'||' should be on a new line.

Unused import - com.fasterxml.jackson.databind.node.IntNode.

Unused import - com.fasterxml.jackson.databind.node.TextNode.

Javadoc tag '@param' should be preceded with an empty line.

Javadoc tag '@param' should be preceded with an empty line.

Member name 'x' must match pattern '^[a-z][a-zA-Z0-9]+$'.

Member name 'x' must match pattern '^[a-z][a-zA-Z0-9]+$'.

Member name 'y' must match pattern '^[a-z][a-zA-Z0-9]+$'.

Distance between variable 'schema' declaration and its first usage is 4, but allowed 3.  Consider making that variable final if you still need to store its value in advance (before method calls that might have side effects on the original value).

',' is not followed by whitespace.