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:
A: No. Just open a new terminal or source your profile. jre linux
A: Absolutely. Most cloud providers and enterprises use OpenJDK-based JREs. openjdk version "11
// Hello.java public class Hello public static void main(String[] args) System.out.println("JRE works! Version: " + System.getProperty("java.version")); Most cloud providers and enterprises use OpenJDK-based JREs
A: Use server-class VM tuning: -Xmx256m -XX:+UseContainerSupport (for containers). Conclusion The JRE on Linux is a mature, lightweight runtime environment for executing Java applications. For most modern use cases, OpenJDK JRE (or Temurin/Corretto) is the recommended choice – freely available, secure, and well-integrated into all major distributions. Always keep it updated, manage multiple versions cleanly, and set JAVA_HOME correctly to avoid surprises.
Compile on a machine with JDK (or use online compiler), then run on target Linux with JRE:
export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64 export PATH=$JAVA_HOME/bin:$PATH Then reload: