HADOOP-8027. Visiting /jmx on the daemon web interfaces may print unnecessary error in logs. Contributed by Aaron T. Myers. Ported to hadoop-1 by Hitesh Shah.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0@1335192 13f79535-47bb-0310-9956-ffa450edef68
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