1) Download JDK1.7, and install it into any directory of your choice, mine was /home/byorn/Programs/jdk1.7
2) Set Java Home
sudo vim /home/byorn/.bash_profile
export JAVA_HOME=/home/byorn/Programs/jdk1.7.0_21
export PATH=$PATH:$JAVA_HOME/bin
3) sudo update-alternatives --install "/usr/bin/java" "java" "/home/byorn/Programs/jdk1.7.0_21/bin/java" 1
4) sudo update-alternatives --config java
and select your option.
To Test type: java -version
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