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Asked: 2026-05-29T21:54:01+00:00

I need to programmatically instrument the lines of code of a method so that

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I need to programmatically instrument the lines of code of a method so that I can know what lines were touched or not by a certain execution – I want to have a map between the line numbers and if they were run or not.

So far, I have been using JaCoCo to perform this instrumentation. But JaCoCo instruments the whole class and I want to have control of what methods are instrumented.

Can I do this with libraries like ASM, BCEL or javassist? If so, can anyone point me to some documentation or tutorial?

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  1. Editorial Team

    You can look at Cobertura source code (that itself uses ASM). It is not a tutorial, but on the other hand, it is a real world example, and not a toy.

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