https://github.com/mlopatkin/jdk-instrument

https://github.com/mlopatkin/jdk-instrument

Last synced: 2 months ago
JSON representation

• Host: GitHub
• URL: https://github.com/mlopatkin/jdk-instrument
• Owner: mlopatkin
• Archived: true
• Created: 2022-01-11T16:31:18.000Z (over 3 years ago)
• Default Branch: trunk
• Last Pushed: 2022-01-20T15:39:37.000Z (over 3 years ago)
• Last Synced: 2025-02-08T21:11:54.284Z (3 months ago)
• Language: Java
• Homepage:
• Size: 84 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
Intercepting JDK method calls with agent-based instrumentation

==============================================================

This project investigates how to use ByteBuddy to instrument core JDK classes and signed JARs to intercept certain

"interesting" methods.

Run `./gradlew run` to see it in action.

The project is structured as follows:

 - `agent` - the Java agent implemented with ByteBuddy that performs instrumentation.

 - `buildSrc` - a set of convention plugins to set up stuff.

 - `interceptor` - a library that goes into bootclasspath. The instrumented code calls into it. The code that wants to 

    observe the instrumented calls registers callbacks into it too.

 - `interceptor-advices` - ByteBuddy advices used to declare how to instrument classes. These are used in both agent

    based and classloader-based instrumentations, though the latter cannot instrument JDK classes.

 - `test-app-classloader-instrument` - an implementaton that uses a custom classloader to instrument classes as they 

    are loaded.

 - `test-app-premain-init` - a launcher that configures agent and bootclasspath with command-line switches.

 - `test-app-runtime-init` - a launcher that installs agent and bootclasspath at runtime.

 - `test-app-ondisk-instument` - instruments JAR files on disk and then loads them at runtime. As the signed JAR is

    instrumented, the run fails with `SecurityException`.

 - `test-core` - a core implementation of the launcher, independent of the way agent is set up.