Ubuntu 12.10 is about to show up in its stable version this week. Users and developers who want to run or develop Java applications and applets on Ubuntu must have a copy of Java 7 (Update 7) installed on their systems. In this tutorial we will show you how to install JRE7 & JDK7 in Ubuntu 12.10 Quantal Quetzal or older. The tutorial is also applicable for Linux Mint 13 or older.

JRE 7 Installation

Open the terminal and run the following commands to install JRE7:

sudo sh -c "echo 'deb http://www.duinsoft.nl/pkg debs all' >> /etc/apt/sources.list" 
sudo apt-get update 
sudo apt-key adv --keyserver keys.gnupg.net --recv-keys 5CB26B26
sudo apt-get update 
sudo apt-get install update-sun-jre

JDK 7 with NetBeans 7.2 Installation

   - i386/32-bit Systems:

cd /tmp 
wget -c --no-cookies --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com" "http://goo.gl/g9cJl" -O jdk-7u7-nb-7_2-linux-i586-ml.sh 
chmod +x jdk-7u7-nb-7_2-linux-i586-ml.sh 

sudo sh jdk-7u7-nb-7_2-linux-i586-ml.sh

   - amd64/64-bit Systems:

cd /tmp 
wget -c --no-cookies --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com" "http://goo.gl/AJ1oS" -O jdk-7u7-nb-7_2-linux-x64-ml.sh 
chmod +x jdk-7u7-nb-7_2-linux-x64-ml.sh 
sudo sh jdk-7u7-nb-7_2-linux-x64-ml.sh

Then follow setup instructions without changing anything:

After you finish the installation, run this sequence of commands:

sudo mkdir -p /usr/lib/jvm/ 
sudo cp -R /usr/local/jdk1.7.0* /usr/lib/jvm/ 
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_07/bin/javac 1 
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_07/bin/java 1

You can choose the Java version you want to use with this command:

sudo update-alternatives --config java 

To check if Java 7 is well installed on your system, open this link and click on "Verify Java Version". If it is installed correctly, you may see this:

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