Optimize your Java development and runtime environment with this comprehensive guide on installing Java Development Kit (JDK) and Java Runtime Environment (JRE) on Linux systems. Java developers need both JDK and JRE to craft and run Java applications and applets efficiently. JDK offers the essential tools for developing Java applications, including the Java compiler, while JRE provides a runtime environment necessary for Java applications.
How to Install Java on Ubuntu and Linux Mint
This guide simplifies the process of installing OpenJDK Java on popular Linux distributions such as Ubuntu and Linux Mint. OpenJDK, an open-source implementation of the Java Platform, Standard Edition, ensures your Java applications run securely and efficiently.
- Update Your Package Index
Begin by updating your package index to ensure you have access to the latest software versions. Execute the following command in your terminal:
sudo apt update
- Install Java OpenJDK
Install OpenJDK 8 by running the following command. This command installs both the JDK and JRE, setting up your system for Java development and execution.
sudo apt install openjdk-8-jdk openjdk-8-jre
- Verifying the Java Installation
After installing Java, verify the installation to ensure Java is correctly installed on your system. Run the following command to check the installed Java version:
This command will display the installed OpenJDK version, confirming the successful installation.
- Setting Up JAVA_HOME and JRE_HOME Environment Variables
To ensure Java applications can locate the Java libraries, it’s crucial to set the JAVA_HOME and JRE_HOME environment variables. These variables point to the installation directories of JDK and JRE, respectively. You can set these environment variables in the /etc/environment file with the following commands:
cat >> /etc/environment <<EOL JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 JRE_HOME=/usr/lib/jvm/java-8-openjdk-amd64/jre EOL
Successfully installing and configuring Java on your Linux system is a foundational step for any Java developer. By following the steps outlined in this guide, developers can efficiently prepare their Linux systems for Java development and application execution. This setup not only facilitates the creation of Java applications but also supports running Java-based software. Whether you’re developing new Java applications or running existing ones, having both JDK and JRE properly installed and configured ensures a robust development and execution environment for your Java projects.