Install JDK on RHEL5/6/7

Prepare : Download JDK from Java and upload to Linux

 cd /opt/jdk1.7.0_79
alternatives --install /usr/bin/java java /opt/jdk1.7.0_79/bin/java 2
alternatives --config java
alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_79/bin/jar 2
alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79/bin/javac 2
alternatives --set jar /opt/jdk1.7.0_79/bin/jar
alternatives --set javac /opt/jdk1.7.0_79/bin/javac 
java -version
export JAVA_HOME=/opt/jdk1.7.0_79

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