PF4J: Plugin Framework for Java. Plugin Systems for Backend

Published: 25 February 2025
on channel: BELLSOFT

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Let’s discover plugin systems for backend, and today we dive into a tiny “Plugin Framework for Java” or PF4J.
We will discuss what a plugin is, how it works, and analyze the code of an app written as an example of implementation of PF4J into a Spring Application.

Get the code from this video here: https://github.com/asm0dey/pf4j-demo

Introduction
0:00 Backend development is not only about services, monoliths, or microservices
0:38 Introduction to PF4J (Plugin Framework for Java)
1:01 What is a plugin?
1:51 Extension point in PF4J
2:21 Plugin lifecycle
2:36 More on PF4J. Three concepts: Extension point, Plugin, Extension explained
3:00 Desktop or web applications?
3:15 How PF4J Spring is different from usual PF4J?

Code Example
3:41 Project structure
4:05 Commons module
4:53 Plugins
7:07 Packaging plugins. Metainformation
8:15 Using plugins inside Spring application
8:57 Spring plugin manager
10:01 Testing application

Conclusion
10:25 When you should use PF4J
10:59 Deploy only parts of application that you need

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