[MacPorts] #53595: hadoop fails to install before and after selfupdate to 2.40

[MacPorts]

#53595: hadoop fails to install before and after selfupdate to 2.40
------------------------------+-------------------
  Reporter:  TheLastLovemark  |      Owner:
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.4.0
Resolution:                   |   Keywords:
      Port:  hadoop           |
------------------------------+-------------------

Comment (by kencu):

 hmm.
 {{{
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_java_hadoop/hadoop/work/hadoop-1.2.1"
 && ant compile-native compile-c++-libhdfs -Dcompile.native=true
 -Dsnappy.prefix=/opt/local -Dcompile.c++=true -Dlibhdfs=true
 info:build Exception in thread "main"
 java.lang.UnsupportedClassVersionError:
 org/apache/tools/ant/launch/Launcher : Unsupported major.minor version
 52.0
 }}}
 what version of ant are you running?
 {{{
 $ ant -v
 Apache Ant(TM) version 1.8.4 compiled on August 8 2013
 }}}

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Ticket URL: <https://trac.macports.org/ticket/53595#comment:3>
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