You don’t need to download anything from this page you’ll download the installation script through apt shortly. Your version number may vary depending on when you’re installing the software. In this case, you would need Oracle JDK 11.0.7. In this image, the version of the script is 11.0.7. Locate the package for Focal, as shown in the following figure: To find out which version you need, visit the oracle-java11-installer page. The version of Oracle’s JDK you’ll need to download must match version of the installer script. Then you can use apt to install it with help from a third party installation script. To install the Oracle JDK, which is the official version distributed by Oracle, you must create an Oracle account and manually download the JDK to add a new package repository for the version you’d like to use. Oracle’s licensing agreement for Java doesn’t allow automatic installation through package managers. Next, let’s look at how to install Oracle’s official JDK and JRE. If Java is not currently installed, you’ll see the following output: Next, check if Java is already installed: To install this version, first update the package index: By default, Ubuntu 20.04 includes Open JDK 11, which is an open-source variant of the JRE and JDK. The easiest option for installing Java is to use the version packaged with Ubuntu. One Ubuntu 20.04 server set up by following the the Ubuntu 20.04 initial server setup guide tutorial, including a sudo non- root user and a firewall.When you’re finished, you’ll be able to use the JDK to develop software or use the Java Runtime to run software. You’ll then select the version you wish to use for your projects. You’ll install OpenJDK as well as the official JDK from Oracle. In this guide, you will install various versions of the Java Runtime Environment (JRE) and the Java Developer Kit (JDK) using apt. Then, add your Terminal input from step 3 to this file: # SWITCH TO JAVA VERSION 8 export JAVA_HOME=`/usr/libexec/java_home -v 1.Java and the JVM (Java’s virtual machine) are required for many kinds of software, including Tomcat, Jetty, Glassfish, Cassandra and Jenkins. ![]() (Optional) To make this the default JDK version, input the following in Terminal: open ~/.bash_profile If you have followed all the steps correctly, the JDK version should correlate with the one you specified in the last step.ĥ. Check your JDK version by inputting into Terminal: java -version For example, if you wish to switch to JDK 8, input the following line: export JAVA_HOME=`/usr/libexec/java_home -v 1.8`Ĥ. For example, “11.0” and “1.8” are the JDK versions available in the example above.ģ. Take note of the JDK version you want to switch to. Once you have installed the appropriate JDK, repeat this step.Ģ. If you don’t notice the Java version you need to switch to, download and install the appropriate one from here (JDK 8 is represented as 1.8). Your output should look like: Matching Java Virtual Machines (2): 11.0.1, x86_64: "Java SE 11.0.1" /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home 1.8.0_201, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home For example, applications such as Cassandra will only work with JAVA version 8.įirst, you need to make certain you have multiple JAVA versions installed. This can be useful for working with apps which don’t work with updated JAVA versions. ![]() This tutorial will guide you on how to switch JAVA versions on your MacOS device.
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