OpenJDK 9 Download and Installation on Ubuntu

Quick guide to download and install OpenJDK 9 on Ubuntu. - OpenJDK Community Version

What is OpenJDK

OpenJDK is the short form of Open Java Development Kit similar to Oracle's Java Development Kit used to develop Java Applications. Main difference between Oracle JDK and OpenJDK is that OpenJDK is free for all while Oracle Java Development Kit or Oracle JDK requires commercial license. For more details refer openjdk vs oracle jdk

If you want to know more about OpenJDK, you can go through Open Java Development Kit Quick guide.

Note: To uninstall previously installed OpenJDK please refer Uninstall openJDK ubuntu

Step #1: Download

Open jdk 9 download:
Go to https://jdk.java.net/archive/ and download the OpenJDK 9 tar distribution jdk-9+181_linux-x64_ri.zip. Here is the quick lik to download the OpenJDK 9 tar file jdk-9+181_linux-x64_ri.zip

Step #2: Install

Ubuntu Java 9 Install - To Install OpenJDK 9 Java Runtime, Enter the below command on Ubuntu command line.

$ sudo apt-get install openjdk-9-jre

The openjdk-9-jre package contains just the Java Runtime Environment. If you want to develop Java programs then please install the openjdk-9-jdk package.
To Install OpenJDK 9 Java Development Kit (JDK) - Enter the below command on Ubuntu command line.

$ sudo apt-get install openjdk-9-jdk

Step #3: Configure / SET JAVA_HOME Path

Once the above steps are successfully completed , we need to set the "JAVA_HOME" and "PATH" environment variables. Enter the following commands to set your environment variables. Make sure that your environment variables point to a valid installation of JDK on your Ubuntumachine.

export JAVA_HOME=/usr/lib/jvm/openjdk-9-jdk

Add the JAVA bin directory to the PATH variable

export PATH=$PATH:$JAVA_HOME/bin

This will append the java bin directory to the existing PATH variable. You can also check the PATH variable by entering the following command

Step #4: Verify

Once the OpenJDK 9 Download and installation is complete, we can verify the installed OpenJDK 9 version using below Command.

Go to Ubuntu prompt and type java -version
The above command prints the OpenJDK 9 version you installed.


			Java -version

$ java --version
openjdk 9
OpenJDK Runtime Environment (build 9-ea+18-Ubuntu-1)
OpenJDK 64-Bit Server VM (build 9ea+18-Ubuntu-1, mixed mode, sharing)

Congratulations !!! Now you have installed OpenJDK 14 Successfully.

Step #5: OpenJDK Known Issues

Note: Here is the list of OpenJDK known-issues OpenJDK Known Issues


			
			
 Here are the ubuntu openjdk packages you might be interested in!


			Ubuntu package openjdk-8-jdk

			Ubuntu package openjdk-9-jdk

			Ubuntu package openjdk-11-jdk

			Ubuntu package openjdk-13-jdk

			Ubuntu package openjdk-14-jdk

			Ubuntu package openjdk-15-jdk

			
			

 	
			If you are looking out for earlier OpenJDK versions, go to  OpenJDK Archive