Would you like to learn how to install Java JDK on Ubuntu Linux? In this tutorial, we are going to show you how to install Java JDK using the command-line of a computer running Ubuntu Linux version 17.

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Tutorial - Java JDK on Ubuntu Linux

On the Linux console, use the following commands to install Java JDK.

# apt-get update
# apt-get install default-jdk

Use the following command to find the Java JDK installation directory.

# update-alternatives --config java

There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
Nothing to configure.

In our example,  our Java JDK is installed under the folder: /usr/lib/jvm/java-8-openjdk-amd64

Now, you need to create an environment variable named JAVA_HOME.

Let’s create a file to automate the required environment variables configuration.

# vi /etc/profile.d/java.sh

Here is the java.sh file content.

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64

Now, let’s reboot the computer.

# reboot

Use the following command to verify if the JAVA_HOME variable was created.

# env | grep JAVA_HOME


Use the following command to test the Java JRE installation.

# java -version

openjdk version "1.8.0_162"
OpenJDK Runtime Environment (build 1.8.0_162-8u162-b12-0ubuntu0.16.04.2-b12)
OpenJDK 64-Bit Server VM (build 25.162-b12, mixed mode)