Bytecode Manipulation #1863
Bytecode Manipulation
#1863
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Q: How would you modify bytecode at runtime? |
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Answered by
shivrajcodez
Mar 21, 2026
Replies: 1 comment
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Use Java Instrumentation API (java.lang.instrument) |
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Use Java Instrumentation API (java.lang.instrument)
Create a Java Agent (premain/agentmain)
Apply ClassFileTransformer to modify classes
Libraries:
ASM → low-level, fast
Javassist → easier API
Byte Buddy → modern & clean
Use cases: logging, AOP, monitoring, proxies