MAPREDUCE-5020. Compile failure with JDK8 (Trevor Robinson via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1521590 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5085. Merge change r1521607 from branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1521609 13f79535-47bb-0310-9956-ffa450edef68