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kriegaex / BootstrapAgent.java

Last active January 19, 2024 03:52 — forked from joshgord/BootstrapAgent.java

An example agent that intercepts a method of the bootstrap class loader. Tested with Byte Buddy 1.14.11 on JDKs 8 to 21.

	package net.bytebuddy;

	import net.bytebuddy.agent.ByteBuddyAgent;
	import net.bytebuddy.agent.builder.AgentBuilder;
	import net.bytebuddy.dynamic.ClassFileLocator;
	import net.bytebuddy.dynamic.loading.ClassInjector;
	import net.bytebuddy.implementation.MethodDelegation;
	import net.bytebuddy.implementation.bind.annotation.SuperCall;
	import net.bytebuddy.matcher.ElementMatchers;

kriegaex / BootstrapAdviceAgent.java

Last active January 19, 2024 06:41

An example agent that intercepts bootstrap class method String::concat. Tested with Byte Buddy 1.14.11 on JDKs 8 to 21. Based on a question about https://gist.github.com/kriegaex/0f4dd4c9d05f3a68e3a8e1ed75359c3b.

	import net.bytebuddy.agent.ByteBuddyAgent;
	import net.bytebuddy.agent.builder.AgentBuilder;
	import net.bytebuddy.agent.builder.ResettableClassFileTransformer;
	import net.bytebuddy.asm.Advice;
	import net.bytebuddy.asm.Advice.*;
	import net.bytebuddy.dynamic.loading.ClassInjector;

	import java.io.IOException;
	import java.lang.instrument.Instrumentation;
	import java.lang.instrument.UnmodifiableClassException;