openjdk version "11.0.22" 2024-01-16 OpenJDK Runtime Environment (build 11.0.22+7-post-Ubuntu-0ubuntu222.04.1) OpenJDK 64-Bit Server VM (build 11.0.22+7-post-Ubuntu-0ubuntu222.04.1, mixed mode, sharing) To see the exact JRE path:
// Hello.java public class Hello public static void main(String[] args) System.out.println("JRE works! Version: " + System.getProperty("java.version"));
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: jre linux
A: Some JDK packages include a full JRE, and the java binary is the same.
# 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: openjdk version "11
java -version Example output (OpenJDK 11):
export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64 export PATH=$JAVA_HOME/bin:$PATH Then reload: Testing JRE with a Sample Java Application Create
source ~/.bashrc curl -s "https://get.sdkman.io" | bash sdk install java 17.0.9-tem sdk use java 17.0.9-tem 8. Setting JAVA_HOME Correctly Even if you only need the JRE, many applications check JAVA_HOME . Point it to the JRE installation directory.