In 1.1.0 we upgraded to Mockito 1.9.5 for a variety of reasons described on MRUNIT-13. However, Hadoop still uses 1.8.5. As such, you may need to exclude their version with the exclusion below.
<exclusion> <groupId>org.mockito</groupId> <artifactId>mockito-all</artifactId> </exclusion>
