Amazon Corretto 21 installation on RHEL 9 | How to install Java 21 on Linux with JAVA_HOME

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Published on March 28, 2024 10:42:06 PM ● Video Link: https://www.youtube.com/watch?v=8cLiotQciaQ

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Amazon Corretto is a no-cost, multiplatform, production-ready distribution of the Open Java Development Kit (OpenJDK).
Corretto comes with long-term support that will include performance enhancements and security fixes.
Amazon runs Corretto internally on thousands of production services and Corretto is certified as compatible with the Java SE standard.
With Corretto, you can develop and run Java applications on popular operating systems, including Linux, Windows, and macOS.

In this video we are going to see how to install Amazon Corretto 21 on Red hat Enterprise Linux 9 for all users with JAVA_HOME Environment Variable

In this Example:

src ---- contains two java modules IPv4Validator and IPv4ValidatorClient Modules. Each Module must contain module-info.java which is mandatory.
classes ---- will store all the compiled class files of Java Modules.

Here IPv4Validator Module contains module-info.java which exports the com.javafrm package, so that other modules can access the package and com.javafrm package contains IPv4Validator.java .
Class name and Method should be public, then only you can access this class and required methods from other modules.

Next IPv4ValidatorClient Module contains contains module-info.java which requires (calls) IPv4Validator Module.
It contains org.javafrm package which contains IPv4ValidatorClient.java (Main class) and access the class and methods from IPv4Validator Module.

Example commands:

javac --module IP4ValidatorModule -d /opt/Java-Module-Programs/Modules/classes --module-source-path /opt/Java-Module-Programs/Modules/src

javac --module IP4ValidatorClientModule -d /opt/Java-Module-Programs/Modules/classes --module-source-path /opt/Java-Module-Programs/Modules/src

java --module-path /opt/Java-Module-Programs/Modules/classes --module IP4ValidatorClientModule/org.javafrm.IPv4ValidatorClient

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