Install Java JDK on Ubuntu Linux

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.

Hardware List:

The following section presents the list of equipment used to create this Ubuntu Linux tutorial.

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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.

#/bin/bash
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

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

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)