I have done quite a lot with Spring and AOP in the past (have been a long time Spring supporter), but every time I need it in a project and look at the reference documentation, I find it more and more confusing and getting too complex for day to day use (especially if not every team member is a Spring expert). It is not because I don’t understand AOP:
– I have used it for quite some time
– I do quite a lot of bytecode manipulation on the Multiverse project.
What is wrong with Spring AOP?
– everything can be combined with everything in all kinds of different ways (so too many permutations)
– there are 10.000 ways to configure it and the configuration can be spread all over the place (including in the source).
– Spring documentation (which is very detailed) is not written in a way to get you up and running fast (so a complete working copy/paste hello world solution).
– bytecode weaving of AspectJ gives problems with load time weaving (administrators, influences other applications on the same jvm) but compile time weaving in combination with Maven also gives problems because the bytecode is modified before the unit tests are executed.
It doesn’t mean that Spring AOP is bad from a technology point of view, but it certainly is bad from a productivity point of view. I love to solve complex problems, but I don’t like to solve problems that are needlessly complex. And Spring AOP imho is a good example of Spring becoming the problem it tried to solve: needless complexity.