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Bytecode Instrumentation Agent

Java agent that instruments bytecode at runtime for profiling: measures method duration, counts invocations, and exposes JMX metrics.

5 steps
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Project steps

  1. 01

    Java Agent setup

    premain() with Instrumentation API; JAR with MANIFEST.MF Premain-Class.

  2. 02

    Byte Buddy transformer

    AgentBuilder: intercepts methods with @Timed annotation and wraps them with timing.

  3. 03

    Metrics collection

    Micrometer: Timer per method signature, Counter for invocations.

  4. 04

    JMX exposure

    Exposes metrics via MBean for inspection with jconsole/VisualVM.

  5. 05

    Prometheus scrape

    HTTP /metrics endpoint for Prometheus with all collected metrics.

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Fork the repo on GitHub and start building. A mentor will review your code when you open a PR.

5 steps

Tech stack

JavaByte BuddyASMJMXMicrometer