To validate the successful install of Java on Ubuntu with apt, issue the following command: java -version To install Java on Ubuntu without any of the extra software development tools, you can install just the JRE with the following command: sudo apt install default-jre The JDK additionally has a few extra features packaged with it to facilitate software development. Using /usr/lib/jvm/java-11-openjdk-amd64/bin/jconsole Setting up default-jdk-headless (2:1.11-72build2). ![]() Install the JDK with the following command: sudo apt install default-jdk ![]() The Java Development Kit (JDK) provides everything a user needs to run Java applications. The full Java suite includes the Java Runtime Environment (JRE), Java Virtual Machine (JVM) and utilities to develop Java source code. Fix the “ServerRoot Must be a Valid Directory” error. ![]()
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