Jakub Holý posts a first-rate introduction to code injection in Java. As Jakub points out, The coolest thing is that it enables you to modify third party, closed-source classes and actually even JVM classes.
My personal experience with AOP and code injection is mixed, I generally prefer code generation and classpath fiddling, but Jakub is right that one should use the best tool for the job. If a tool is unfamiliar, it's an opportunity.
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