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Comment by sufficient | Hacker News Reader

Great work Fabian! Nice to see this work becoming open source.

I am pretty new to fuzzing, please correct me if I am wrong: Since Jazzer fuzzes a Java application at runtime, can it be in principle also be used to fuzz a Java app without having it's source code?

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Yes, that is exactly how it works, there is nothing that would require source code access.

If you have a Java app packaged as app.jar, all you need to do is write a fuzz target (with the fuzzerTestOneInput function) and package it into e.g. target.jar. Then you can run jazzer with

  --cp=app.jar:target.jar --target_class=fuzz.target.Class

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