Hacking A Maven Dependency with Javassist to Fix It

Have you ever wondered what to do when needing “just a small change” to a third-part library your project depended on? This post describes how to use Maven and Javassist to take a dependency of your project, instrument it to modify its behavior, re-pack it, and release it as an artifact with a different nameContinue reading “Hacking A Maven Dependency with Javassist to Fix It”

Practical Introduction into Code Injection with AspectJ, Javassist, and Java Proxy

The ability to inject pieces of code into compiled classes and methods, either statically or at runtime, may be of immense help. This applies especially to troubleshooting problems in third-party libraries without source codes or in an environment where it isn’t possible to use a debugger or a profiler. Code injection is also useful forContinue reading “Practical Introduction into Code Injection with AspectJ, Javassist, and Java Proxy”

Implementing build-time bytecode instrumentation with Javassist

If you need to modify the code in class files at the (post-)build time without adding any third-party dependencies, for example to inject cross-cutting concerns such as logging, and you don’t wan’t to deal with the low-level byte code details, Javassist is the right tool for you. I’ve already blogged about “Injecting better logging intoContinue reading “Implementing build-time bytecode instrumentation with Javassist”