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export JAVA_HOME=/usr/java/jdk1.6.0_16
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export PATH=$PATH:$JAVA_HOME/bin
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$ java -version
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b33)
Java HotSpot(TM) Client VM (build 11.0-b15, mixed mode, sharing)
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