wget https://maven.aliyun.com/repository/public/com/taobao/arthas/arthas-packaging/3.3.6/arthas-packaging-3.3.6-bin.zip
# 反编译
$ jad --source-only com.example.demo.arthas.user.UserController > /tmp/UserController.java
# 修改文件
$ vim /tmp/UserController.java
# 查找加载的 ClassLoader
$ $ sc -d *UserController | grep classLoaderHash
classLoaderHash 6bc28484
# 编译
$ mc -c 6bc28484 /tmp/UserController.java -d /tmp
# 热更新
$ redefine /tmp/com/example/demo/arthas/user/UserController.class
转自：https://blog.csdn.net/javageektech/article/details/101443191