Writing your instrumentation agent using java.lang.instrument package.
package org;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.security.ProtectionDomain;
public class Instrument {
public static void main(String[] args) {
System.out.println("Agent Started...");
}
class Transformer implements ClassFileTransformer{
public byte[] transform(ClassLoader loader, String className,
Class classBeingRedefined, ProtectionDomain protectionDomain,
byte[] classfileBuffer) throws IllegalClassFormatException {
System.out.println("ClassName:"+className);
return null;
}
}
}
Run:
java -javaagent:test.jar org.Instrument
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