Java Module System
The Java Module System, introduced in Java 9 as part of Project Jigsaw, is a feature that enables strong encapsulation, reliable configuration, and scalable development for Java applications. It organizes code into modules, which are self-contained units with explicit dependencies and controlled access to APIs, helping to manage large codebases and reduce classpath issues.
Developers should learn the Java Module System when building large-scale, maintainable applications or libraries, as it improves application architecture by enforcing modular design and reducing runtime errors from missing dependencies. It is particularly useful for creating modular applications, such as microservices or enterprise systems, where clear boundaries and dependency management are critical for scalability and deployment.