How Can I Efficiently Find Java Classes Implementing a Specific Interface at Runtime?

Retrieving Java Classes Implementing an Interface

In the realm of Java programming, the ability to locate classes that implement a specific interface is a valuable capability. Whether for interfacing with third-party libraries or implementing plugin architectures, finding these implementing classes is essential.

The Java ecosystem offers a solution for this task, albeit hidden in an inconspicuous location. This solution lies within the ASM library, harnessed by James Clapper's JavaUtil library. This library provides the ClassFinder class, specifically designed to identify classes implementing a given interface.

Unlike IDE functions, ClassFinder operates within the Java application, enabling runtime introspection. By leveraging the ASM library, JavaUtil outperforms reflection-based approaches in terms of efficiency.

To utilize ClassFinder, one needs to incorporate the JavaUtil library into their project. The library is BSD-licensed, offering the freedom to bundle it with proprietary code. With its efficient scanning capabilities and open-source availability, ClassFinder stands as a robust solution for locating Java classes implementing a specified interface. Additionally, for Scala users, a Scala-centric alternative library is available.

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