How to Install Oracle Java 7 update 9 on Ubuntu 12.04 Linux

Abstract

This blog entry will guide you through the step-by-step installation of Java on Ubuntu. I selected Oracle Java 7 update 9 and Ubuntu Linux 12.04 LTS 32 bit for this post.

Introduction

Installing Java on Linux follows the download-extract-configure pattern. We will begin by downloading Oracle Java from Oracle’s website, extracting the download in the appropriate folder, and finally informing Ubuntu about the newly installed version of Java.

Step 1: Verify that you do not already have the correct version of Java installed.

Open your console window and enter the following command:

java –version

If you get the following result, you already have Java 7 update 9 installed and can ignore the rest of the steps:

java version 1.7.0_09
Java(TM) SE Runtime Environment (build 1.9.0_09-b05)
Java HotSpot(TM) Client VM (build 23.5-b02, mixed mode)

Step 2: Download Oracle Java.

New release of Java are featured on the main Java download page.

If Java 7 update 9 is no longer featured, you can find the download by following the Previous Releases link found on the main download page.

Open the Java download page in your browser and download both jdk-7u9-linux-i586.bin and jre-7u9-linux-i586.bin

Make a note of the folder to which you downloaded the files. For further reference in this blog, I will call this folder the “downloads folder”.

Step 3: Create the installation folder.

The usr/lib/jvm is the default installation location of the Java JDK and the Java JRE. Enter the following command in your console to create this folder, if it does not already exist:

sudo mkdir -p /usr/lib/jvm

The –p option ensures that all folders in the mkdir path are created.

Step 4: Navigate to the “downloads folder”.

If you downloaded the files to your Home folder, you can use the following command:

cd ~/

or substitute "~/" with the path to the “downloads folder”.

Step 5: Move the downloaded files to the installation folder.

sudo mv jdk-7u9-linux-i586.tar.gz /usr/lib/jvm
sudo mv jre-7u9-linux-i586.tar.gz /usr/lib/jvm

Step 6: Navigate to the “installation folder”.

cd /usr/lib/jvm

Step 7: Unpack the tarball archives.

sudo tar zxvf jdk-7u9-linux-i586.tar.gz
sudo tar zxvf jre-7u9-linux-i586.tar.gz

If you want to conserve space to may delete the tarball archives.

sudo rm jdk-7u9-linux-i586.tar.gz
sudo rm jre-7u9-linux-i586.tar.gz

Step 8: Display the contents of the installation folder.

ls -l

Response:

jdk1.7.0_09
jre1.7.0_09

Make a note of the newly created folder names.

Step 9: Inform Ubuntu where your Java installation is located.

sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0_09/bin/javac" 1
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jre1.7.0_09/bin/java" 1

Step 10: Inform Ubuntu that this is your default Java installation.

sudo update-alternatives --set "javac" "/usr/lib/jvm/jdk1.7.0_09/bin/javac"
sudo update-alternatives --set "java" "/usr/lib/jvm/jre1.7.0_09/bin/java"

Step 11: Update your system-wide PATH.

Edit your /etc/profile file using:

sudo nano /etc/profile

and add the following entries to the bottom of the file:

JAVA_HOME=/usr/lib/jvm/jdk1.7.0_09
PATH=$PATH:$JAVA_HOME/bin
export JAVA_HOME
export PATH

Save your /etc/profile file using CTRL+X.

Step 12: Reload your system-wide PATH.

. /etc/profile

Step 13: Test your new installation.

java –version

Response:

java version 1.7.0_09
Java(TM) SE Runtime Environment (build 1.9.0_09-b05)
Java HotSpot(TM) Client VM (build 23.5-b02, mixed mode)

 

javac –version

Response:

javac 1.7.0_09

Step 14: Congratulations! You have just installed Oracle Java on Ubuntu Linux!

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