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Spring AOP Under the Hood: How proxies work
Unlocking the magic behind Spring’s cross-cutting concerns — how proxy patterns seamlessly weave behavior into your Java applications.
When I first encountered Spring AOP (Aspect — Oriented Programming), it seemed like magic. My Java code began executing extra behavior without my explicit command. Log statements showed up, transaction handled themselves, and security check happened automatically. But as with any advanced technology, the magic has a clear explanation.
In this article, we will pull back the curtain on Spring AOP and explore how it uses proxy patterns to weave behavior into your applications. We will look at both the theory and practical implementations so you can make the most of this powerful feature.
What is AOP and why should you care?
Aspect — Oriented programming allows you to keep cross — cutting concerns separate. This includes things like logging, security, and transaction management, which don’t mix with your main business logic. Define behavior once instead of repeating them in your code. Then, declare where to use them.
For example, instead of adding transaction management to every service method:
