In this tutorial, you learned how to install Java Runtime Environment ( JRE) and the Java Developer Kit ( JDK) on Ubuntu 20.04 and Ubuntu 18.04. You will get the following output: /usr/lib/jvm/java-11-openjdk-amd64 Verify that the environment variable is set: $ echo $JAVA_HOME To set up the JAVAHOME variable, find where Java is installed. The variable helps other applications access Java's installation path easily. sudo apt-get -y install openjdk-18-jdk Reading package lists. ![]() Save the file and reload the file to apply the changes to your current session: $ source /etc/environment The JAVAHOME environment variable determines the location of your Java installation. Then open /etc/environment file using nano text editor: $ sudo nano /etc/environmentĪdd the following line at the end of the file, make sure to replace the location of your Java installation path. You will get the following output: /usr/lib/jvm/java-11-openjdk-amd64/bin/java To set the JAVA_HOME environment variable, first, discover where Java is installed by running the following command. Most of the Java-based software programs use the JAVA_HOME environment variable to discover the Java installation location. For more info about search patterns you can look up manual regex(7) by command man 7 regex or in English. Setting the JAVA_HOME Environment Variable in Ubuntu sudo apt-get update then use 'search regex' function in apt-cache where 'regex' stands for Regular Expression and is the pattern given to search. You will get the following output: javac 11.0.10 $ sudo apt install default-jdkĪfter installation, verify the JDK installation by checking the version as shown. To install the JDK, run the following command. Once JRE installed, you might also need the JDK ( Java Development Kit) in order to compile and run a Java-based application. OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.20.04, mixed mode, sharing) OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.20.04) In a terminal, use the following command to install OpenJDK Java Development Kit: sudo apt install default-jdk. You will get the following output: openjdk version "11.0.10" It contains the Java Compiler (javac) package. Once Java installed, you can verify the installation with: $ java -version ![]() Now run the following command to install the default OpenJDK 11, which will provide Java Runtime Environment ( JRE). Sudo apt install openjdk-13-jre-headless # version 13.0.4+8-1~20.04 Step 1 Installing Java Installing Java comes with two main components. Sudo apt install openjdk-8-jre-headless # version 8u282-b08-0ubuntu1~20.04 Sudo apt install default-jre # version 2:1.11-72 Command 'java' not found, but can be installed with: If you had the default oracle-java8-jdk installed, remove it with apt-get remove oracle-java8-jdk, then you can exit the root terminal with exitenter. Once the package is installed, you have to accept the license ( press Tab to highlight) before starting the download process.If Java is not currently installed, you will get the following output. Log in to your root account or use sudo to run the commands listed below. ![]() Headless Java Runtime Environment (without GUI support). ![]() Type user password (no asterisk feedback) when it asks and hit Enter to continue.Ģ.) After adding PPA, refresh system package cache and install the script: sudo apt update Java Runtime Environment including graphic components. The “Linux Uprising” team ppa has made the installer script, which automatically downloads and installs Oracle JDK 15 package, and sets Java 15 as the default Java version (setting JAVA_HOME, etc.) on 64-bit Ubuntu based system.ġ.) Open terminal and run command to add the PPA: sudo add-apt-repository ppa:linuxuprising/java See the release note for what’s new in Oracle Java 15. The installer script has been made into PPA for Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, and their derivatives. Oracle Java 15 was released a few days ago.
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