Patching Third-Party Library Bytecode at Runtime
summary
The talk covers runtime patching of third-party Java libraries by hooking the classloader using a javaagent and manipulating JVM bytecode with Javassist. It explains the motivation (when forking or modifying source is impossible), shows how to install a classloader hook via javaagent, compares high-level bytecode-manipulation libraries, and presents four concrete patching techniques implemented with Javassist, plus notes on reliability and testing of patched classes.
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chapters (7)
- 0:00Introduction
- 7:47Library patching problem
- 17:29Java Agent and bytecode
- 27:07Class patching methods
- 37:00Testing and deployment
- 40:56Reliability and usability
- 42:22Conclusion and Q&A
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