Install Oracle JDK 9 on Linux

Oracle Java Development Kit 9 has been released recently. This article explains how to manually install the latest Oracle Java Development Kit 9 (Oracle JDK 9) on Linux.

Note: This article uses JDK 9 to demonstrate the installation. In the provided commands, replace the version specific paths and file names according to your downloaded version.

Step 1:

Download the latest JDK(jdk-9$java_update_no_linux-x64_bin.tar.gz) from this official link.
If you want to download to a remote server or if you simply prefer wget, use the command given in this StackOverflow answer: Downloading JDK

Step 2:

Open the terminal (Ctrl + Alt + T) and enter the following command.

sudo mkdir /usr/lib/jvm

If the /usr/lib/jvm folder does not exist, this command will create the directory. If you already have this folder, you can ignore this step and move to next step.

Step 3:

Enter the following command to change the directory.

cd /usr/lib/jvm

Step 4:

Extract the jdk-Xuxx-linux-xXX.tar.gz file in that directory using this command.

sudo tar -xvzf ~/Downloads/jdk-9$java_update_no_linux-x64_bin.tar.gz

According to this command, the JDK filename is jdk-9$java_update_no_linux-x64_bin.tar.gz and which is located in the ~/Downloads folder. If your downloaded file is in any other location, change the command according to your path.

Step 5:

Enter the following command to open the environment variables file.

sudo nano /etc/environment

According to your personal preference, you can choose any text editors instead of nano.

Step 6:

In the opened file, add the following bin folder to the existing PATH variable.

/usr/lib/jvm/$java_version/bin

The PATH variables must be separated by semicolon.

Add the following environment variables at the end of the file.

JAVA_HOME="/usr/lib/jvm/$java_version"

The environment file before the modification:

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"

The environment file after the modification:

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/lib/jvm/$java_version/bin"
JAVA_HOME="/usr/lib/jvm/$java_version"

Save the changes and close the gedit.

Step 7:

Enter the following commands to inform the Ubuntu about the Java's location. Depending on your JDK version, the paths can be different.

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/$java_version/bin/java" 0

sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/$java_version/bin/javac" 0

sudo update-alternatives --set java /usr/lib/jvm/$java_version/bin/java

sudo update-alternatives --set javac /usr/lib/jvm/$java_version/bin/javac

Step 8:

To verify the setup enter the following commands and make sure that they print the location of java and javac as you have provided in the previous step.

update-alternatives --list java

update-alternatives --list javac

Step 9:

Restart the computer (or just log-out and login) and open the terminal again.

Step 10:

Enter the following command.

java -version

If you get the installed Java version as the output, you have successfully installed the Oracle JDK in your system.

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