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AspectJ in Action: greenhorn gotcha's

 
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When first attempting to implement a solution using AOP (AspectJ), what common errors/mistakes have you found that "greenhorns" make?

In your opinion, why did they make those mistakes?

-Fred
 
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A common mistake I see is failing to write good pointcuts. The reason is not investing time in learning AOP concepts and especially the join point model. The remedy, fortunately, is easy -- spend a day or two learning AOP. In a sense, this is no different than OOP: unless one has a firm grasp of the core OOP concepts, he is likely to produce code that is no better (and perhaps worse) than, say, procedural code.
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
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