Github user bizmate commented on a diff in the pull request:

    https://github.com/apache/nutch/pull/111#discussion_r63435076
  
    --- Diff: docker/hbase/Dockerfile ---
    @@ -94,7 +94,7 @@ RUN mv /tmp/hadoop-etc/* /opt/hadoop/etc/hadoop
     RUN mv /tmp/hbase-etc/* /opt/hbase/conf/
     RUN mv /tmp/nutch-etc/* /opt/apache-nutch-2.x/conf/
     
    -ENV JAVA_HOME /usr
    +ENV JAVA_HOME /usr/lib/jvm/java-7-oracle
     ENV NUTCH_ROOT /opt/apache-nutch-2.x
    --- End diff --
    
    To avoid creating another layer could you chain the env variables creation 
as such?
    
    ```
    ENV NUTCH_ROOT /opt/apache-nutch-2.x \
            JAVA_HOME /usr/lib/jvm/java-7-oracle
    ```
    Thanks for the fix


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