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Editorial Team
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Asked: 2026-06-05T05:21:31+00:00

Is it possible to spy on the method calls being made to instances of

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Is it possible to spy on the method calls being made to instances of a Java class. I know I could achieve this using java.lang.reflect.InvocationHandler. I’m wondering if there are other easier ways which don’t involve modifying the source code of the classes?

EDIT:
For example java.util.HashMap. The source code for this class is not available – at least for me it’s not when running under Oracle’s JDK. How would I intercept the calls made to the put(…) method. I would like to inspect the parameters in the call.

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1 Answer

  1. Editorial Team

    You might do this with Aspect Oriented Programming.
    You’re just have to declare pointcuts of your code, which you’re want to ‘spy’. In a few words – you’re might declare annotations, put them above methods signatures, and all annotated methods might been modified by compiler in a compile time (or been modified in time of loading bytecode to jvm) without needs to modify their source code.

    AspectJ is useful for this.

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