You should see the path of all Java versions in the following output: There are 3 choices for the alternative java (providing /usr/bin/java).Omada SDN Controller relies on the Java Runtime Environment (JRE) and this article will guide you through the installation of it on your Windows PC.įor the installation guide on the Linux system, please refer to FAQ 3272. You will need to set JAVA_HOME environment variable to define the Java path in some Java applications.įirst, find the Java installation path with the following command: update-alternatives -config java You should get the following output: update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in manual mode Type 3 and hit Enter to set Java 8 as the default Java version. Press to keep the current choice, or type selection number: 3 * 2 /usr/lib/jvm/java-15-oracle/bin/java 1091 manual modeģ /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode You should see a list of all installed Java versions in the following output: There are 3 choices for the alternative java (providing /usr/bin/java).Ġ /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 auto modeġ /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode To set the Java default version from Oracle Java 15 to Java 8, run the following command: update-alternatives -config java If you have multiple versions of Java installed in your system, you can easily set the default version using the update-alternatives command. ![]() Java HotSpot(TM) 64-Bit Server VM (build 15.0.1+9-18, mixed mode, sharing) Java(TM) SE Runtime Environment (build 15.0.1+9-18) ![]() You should get the following output: java version "15.0.1" Once the installation has been finished, you can verify it with the following command: java -version When the repository is added, you can install it with the following command: apt-get install oracle-java15-installer -y Once all the dependencies are installed, add the Java repository with the following command: add-apt-repository ppa:linuxuprising/java You will need to add the third-party repository in your system in order to install Oracle Java.įirst, install the required dependencies with the following command: apt-get install gnupg2 software-properties-common -y OpenJDK 64-Bit Server VM (build 11.0.9.1+1-Ubuntu-0ubuntu1.20.04, mixed mode, sharing)īy default, Oracle Java is not available in the Ubuntu 20.04 default repository. You should get the following output: openjdk version "11.0.9.1" Once Java 11 is installed, you can verify it with the following command: java -version You can install it with the following command: apt-get install openjdk-11-jdk -y BY default, it ships in the Ubuntu 20.04 default repository. Java 11 is the latest LTS version of Java. OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode) You should get the following output: openjdk version "1.8.0_275" Once installed, verify the Java version using the following command: java -version If your application built on Java 8, you can install it with the following command: apt-get install openjdk-8-jdk -y Java 8 is the previous and widely used Java LTS version. ![]() You can do this by running the following commands: apt-get update -y Additionally, replace ‘root’ with the username of the admin account if necessary.īefore starting, you have to make sure that all Ubuntu OS packages installed on the server are up to date. You will need to replace ‘IP_Address‘ and ‘Port_number‘ with your server’s respective IP address and SSH port number. Access to the root user account (or access to an admin account with root privileges).An Ubuntu 20.04 VPS (we’ll be using our NVMe 2 VPS plan).This tutorial will explain how to install Java 8, Java 11, and Oracle Java 15 on Ubuntu hosting. OpenJDK : Java Development Kit includes the JRE and development tools and libraries required to build Java applications. JRE: Java Runtime Environment consists of the Java virtual machine and binaries used to run Java programs. It has a few additional commercial features and permits only non-commercial use of the software. Oracle JDK: It is the official Oracle version of the Java Development Kit. Let’s understand the difference between JRE, OpenJDK, and Oracle JDK. There are different implementations of Java, including JRE, OpenJDK, and Oracle JDK. What is Java? Java is a free, open-source, and most popular language used for developing mobile and desktop applications, and it can run on all major operating systems. Let’s talk about how to install Java on Ubuntu 20.04.
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