Dependency Injection using the Java 9 Modular Framework
The last topic we will learn about is molecularity and basics of Java 9 modules. Now, we will learn how to write modules and how Dependency Injection is handled in modules.
Java 9 has the concept of Service Loader, which is related to IoC and Dependency Injection. New module systems do not provide Dependency Injection, but the same can be achieved by Service Loader and SPI (Service Provider Interface) Pattern. We will now see how this will work with Java 9.
Modules with Service Loader
A service is a bunch of interfaces and classes collectively named a library, which delivers a specific functionality. Simply, we can say API. There are multiple usages for a service and they are called service providers (say implementations) . The client utilizing this service will not have any contact with the implementations. This can be accomplished by utilizing the underneath concept.
Java has ClassLoader
, which simply loads the classes and creates instances...