AOP vs AspectJ
You want to add logging to your application. You have two choices:
- Spring AOP – like a simple screwdriver. Easy to use, works for most tasks, but limited to method calls on Spring beans.
- AspectJ – like a full power tool set. Can do everything, but requires more setup and learning.
Spring AOP:
- Uses runtime weaving (proxies).
- Only works on Spring beans.
- Only method execution joinpoints.
- Easy to configure with @EnableAspectJAutoProxy.
- Good for most enterprise applications.
AspectJ:
- Supports compile-time, load-time, and runtime weaving.
- Works on any Java object (not just Spring beans).
- More joinpoints: constructor calls, field access, etc.
- Requires special compiler or weaving agent.
- Better performance for complex scenarios.
When to use Spring AOP:
- You need basic advice (before, after, around) on Spring beans.
- You want simple configuration.
- Your cross-cutting concerns are method-based.
When to use AspectJ:
- You need to intercept constructor calls or field access.
- You want to apply aspects to non-Spring objects.
- You need better performance with compile-time weaving.
- You are working with legacy code.
Here is how to use AspectJ with Spring (load-time weaving):
<!-- Enable load-time weaving in Spring -->
<context:load-time-weaver/>
And add JVM argument:
-javaagent:path/to/aspectjweaver.jarTwo Minute Drill
- Spring AOP is simpler, proxy-based, limited to Spring beans and method execution.
- AspectJ is full-featured, supports all joinpoints, works on any object.
- Spring AOP covers 90% of use cases.
- AspectJ needed for advanced scenarios (field access, constructors).
- You can use AspectJ with Spring but need extra configuration.
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