解决 Agent JAR loaded but agent failed to initialize

在使用agent进行动态替换class时遇到错误
完整错误错误信息

com.sun.tools.attach.AgentInitializationException: Agent JAR loaded but agent failed to initializeat sun.tools.attach.HotSpotVirtualMachine.loadAgent(HotSpotVirtualMachine.java:121)at com.sun.tools.attach.VirtualMachine.loadAgent(VirtualMachine.java:540)at com.style.note.base.instrument.Attache.main(Attache.java:18)
Disconnected from the target VM, address: '127.0.0.1:54359', transport: 'socket'

问题原因

public class CustomTransformer implements ClassFileTransformer {@Overridepublic byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {ClassPool classPool = ClassPool.getDefault();try {//重点 新的包名已经被修改为//com.style.note.base.instrument.BaseCtClass ctClass = classPool.get("com.style.note.base.Instrument.Base");CtMethod method = ctClass.getDeclaredMethod("process");method.insertBefore("{System.out.println(\"start\");}");method.insertAfter("{System.out.println(\"end \");}");return ctClass.toBytecode();} catch (NotFoundException | CannotCompileException | IOException e) {e.printStackTrace();}return null;}
}

 //包名错误导致加载不到classCtClass ctClass = classPool.get("com.style.note.base.Instrument.Base");

解决办法更新为正确的包名即可成功加载类

其他问题
1.MANIFEST 文件错误检查全类名是否正确
2.agent类的方法 agentmain 一定要正确

public class Agent {/*** agentmain** @param args  args  注意参数为String 而不是String数组* @param instrumentation instrumentation*/public static void agentmain(String args, Instrumentation instrumentation) {//....}
}

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