Learn what a JMOD file is, how it differs from a JAR file, and when to use it.

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JMOD is a Java packaging format introduced with the Java Platform Module System (JPMS) in Java 9. Unlike JAR files, JMOD files are designed for compile and link time only — they cannot be placed on the classpath at runtime. They support native libraries, configuration files, and legal notices in addition to compiled classes. A practical walkthrough shows how to create a modular Java application, package it as a JMOD file using the `jmod create` command, and then use `jlink` to produce a custom minimal Java runtime image (~35 MB vs 400+ MB for a full JDK) containing only the required modules.

JMOD File Format in Java

3. Practical Example: Creating a Custom JRE

<p>The funny thing is to think that sometimes we use JMOD in our daily lives without knowing why.</p>
