Java is one of the most popular programming languages in the world, used for building a wide range of applications from desktops to mobile and web applications. Finally, you can verify if your changes have taken effect by running `java -version`.This article will show you how to upgrade Java 8 to Java 11 on Ubuntu 20.04. This includes finding the installation paths for different versions of Java, adding them to the alternatives system using `update-alternatives`, and configuring the default version. The steps outlined in this blog post provide a detailed guide on how to update Java alternatives on Linux-based systems. The process might vary for other operating systems. Remember, these steps apply to updating Java alternatives on Linux-based systems. This should display the Java version you set as the default. To verify if your changes have taken effect, execute the following command: You can also update alternatives for `javac` (Java compiler) and other Java tools in a similar way, by finding their paths and adding them using the `update-alternatives` command.Ħ. This command lists the available Java versions, their priorities, and allows you to select the default version by entering a number corresponding to the desired version.ĥ. Sudo update-alternatives -install "/usr/bin/java" "java" "/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java" 1Ĥ. Sudo update-alternatives -install "/usr/bin/java" "java" "/usr/lib/jvm/java-11-openjdk-amd64/bin/java" 2 Assign a priority to each version, where a higher number means a higher priority. Add each Java installation to the alternatives using the `update-alternatives` command. Typically, the java executable is located in a specific `bin` directory within the Java installation, e.g., `/usr/lib/jvm/java-11-openjdk-amd64/bin/java`.ģ. Take note of the installation paths for the Java versions you want to add to the alternatives. Use the `find` command or `locate` command, like this:Ģ. Start by finding the Java installations on your system. Here’s a step-by-step process to update Java alternatives:ġ. The Java alternatives system helps manage different Java installations by configuring default versions for tools like Java Compiler (javac), Java Runtime Environment (java), and Java Web Start (javaws). In order to update Java alternatives on a Linux-based system, you can use the `update-alternatives` command. Here is a step-by-step process to update these alternatives. This command helps manage different Java installations by configuring default versions for tools like Java Compiler (javac), Java Runtime Environment (java), and Java Web Start (javaws). Updating Java alternatives on a Linux-based system can be done using the `update-alternatives` command.
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