export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64 /usr/lib/jvm/java-11-openjdk-amd64/ ├── bin/ # java, keytool, etc. ├── lib/ # core libraries (rt.jar, modules, etc.) ├── conf/ # security, logging, net properties ├── legal/ # licenses and notices └── release # version info 10. Testing JRE with a Sample Java Application Create a simple Java program to verify execution:
dirname $(dirname $(readlink -f $(which java))) jre linux
// Hello.java public class Hello public static void main(String[] args) System.out.println("JRE works! Version: " + System.getProperty("java.version")); Version: " + System
A: Some JDK packages include a full JRE, and the java binary is the same. For running Java apps in production – especially
# Install Eclipse Temurin 17 JRE wget -O /tmp/temurin.deb https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.9%2B9/OpenJDK17U-jre_x64_linux_hotspot_17.0.9_9.deb sudo dpkg -i /tmp/temurin.deb For RPM-based systems, replace .deb with .rpm . After installation, verify:
java -version Example output (OpenJDK 11):
For development or building code, install the instead. For running Java apps in production – especially headless servers – the JRE is exactly what you need.