Ubuntu EC2 - Install Sun Oracle Java

Download Java 7 from Oracle.

Put it in /usr/lib/jvm.

Extract and install it

tar -zxvf jdk-7u40-linux-x64.gz

Rename the folder from jdk1.7.0_40 to jdk1.7.0

You should now have jdk1.7.0 inside /usr/lib/jvm

Set java, javac.

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0/bin/javac" 1

Correct the permissions.

sudo chmod a+x /usr/bin/java
sudo chmod a+x /usr/bin/javac
sudo chown -R root:root /usr/lib/jvm/jdk1.7.0

If you have more than one version of java, you can always switch them using

sudo update-alternatives --config java

Check your java version.

java -version