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Jan 2, 2024 · Java 9 Module System. Java 9 has one of the major changes in its features which is the Java module System. The main aim of the system is to collect Java packages and code to be collected into a single unit called a Module.
- What Is A Module?
- Introduction to Java Platform Module System
- Conclusion
In any programming language, modules are (package-like) artifacts containing code, with metadata describing the module and its relation to other modules. Ideally, these artifacts are recognizable from compile-time all the way through runtime. Any application generally is a combination of multiple modules which work together to perform the business ...
2.1. The Problem
Before Java 9, we had ‘packages‘ to group related classes as per business capabilities. Along with packages, we had ‘access modifiers‘ to control what would be visible and what would be hidden to other classes or packages. It has been working great so far. But, explicit dependencies are where things start to fall apart. In Java, dependencies are declared with ‘import‘ statements; but they are strictly ‘compile time’ constructs. Once code is compiled, there is no mechanism to state its runtime...
2.2. How does JPMS Solve the Problem?
With new Java 9 modules, we will have better capability to write well-structured applications. This enhancement is divided into two areas: 1. Modularize the JDK itself. 2. Offer a module system for other applications to use. In Java 9, modules help us in encapsulating packages and managing dependencies. So typically, 1. a class is a container of fields and methods 2. a package is a container of classes and interfaces 3. a module is a container of packages
2.3. Difference between modular and non-modular code
You will not feel any significant difference between regularcode and modular code if you don’t know the specific things to look for. e.g. 1. A module is typically just a jar file that has a module-info.classfile at the root. 2. To use a module, include the jar file into modulepath instead of the classpath. A modular jar file added to classpath is normal jar file and module-info.classfile will be ignored.
Modular applications have many advantages, which you appreciate even more when you come across applications having a non-modular codebase. You must have heard terms like “spaghetti architecture” or “messy monolith“. Modularity is not a silver bullet, but it is an architectural principle that can prevent these problems to a high degree when applied ...
At the core of each module is the module declaration, a file with the name module-info.java that defines all properties of a module. As an example, here's the one for java.sql, the platform module that defines the JDBC API:
Dec 15, 2018 · Java 9. This page will walk through Java 9 Module Example. A Module is a set of packages designed for reuse. In Java 9, Java programs are Modules. Java Module is the main feature introduced in Java 9 release. In Java we have classes, packages and now modules, too. Before Java 9 module, Java programs are packages.
Oct 2, 2023 · Java modules usher in a new era of code organization. They provide a structured approach to bundle related code together, eliminating the chaos of monolithic projects. With modules, developers can compartmentalize code into manageable units, making it easier to navigate, understand, and maintain.
Mar 24, 2024 · In Java, a module is a unit of organization for Java code introduced in Java 9 as part of the Java Platform Module System (JPMS). It encapsulates a set of related packages and resources, providing a way to define dependencies and access controls between different parts of a Java application.
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Nov 7, 2019 · 07 November 2019. To use the Java module system, first, you need to understand it. In this tutorial, I introduce you to: The basic definition of a module, its contents, and configuration. How encapsulation works in Java 9. How the interfaces are defined. How to list the available modules. A comparison of Java 8 and 9 applications.
