how to use custom custom classloader in springboot - spring

Question

How to load beans using custom classloader in spring boot
i need to encrypted the spring boot project.
at first i try using proguard, but fail because spring use lots of Annotations and it has DI .
then i try using custom classloader. i want to encrypt my class files first, and then use my custom classloader to load the encryped class file, then decrypted it。
here it is my demo: https://github.com/CaiBaoHong/boot-by-custom-loader
when it is starting up it fail:
ConfigServletWebServerApplicationContext :
Exception encountered during context initialization - cancelling refresh attempt:
org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'methodValidationPostProcessor' defined in class path resource
[org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]:
Unsatisfied dependency expressed through method 'methodValidationPostProcessor' parameter 0;
nested exception is
org.springframework.beans.factory.CannotLoadBeanClassException:
Error loading class [com.abc.bootbycustomloader.controller.UserController]
for bean with name 'userController' defined in file
[D:\code\boot-by-custom-loader\out\production\classes\com\abc\bootbycustomloader\controller\UserController.class]: problem with class file or dependent class;
nested exception is java.lang.LinkageError: loader (instance of com/abc/bootbycustomloader/loader/MyClassLoader):
attempted duplicate class definition for name:
"com/abc/bootbycustomloader/controller/UserController"
#SpringBootApplication
public class ServerApplication {
public static void main(String[] args) {
MyResourceLoader rLoader = new MyResourceLoader();
SpringApplication app = new SpringApplicationBuilder().build();
app.addPrimarySources(Arrays.asList(ServerApplication.class));
app.setResourceLoader(rLoader);
app.run(args);
}
}
#RestController
#RequestMapping("/user")
public class UserController {
#RequestMapping("/hello")
public String hello(){
System.out.println("hello hello hello...");
return "hello";
}
}
public class MyResourceLoader extends DefaultResourceLoader {
private ClassLoader cl = new MyClassLoader();
#Override
public Resource getResource(String location) {
System.out.println("getResource: "+location);
return super.getResource(location);
}
#Override
public ClassLoader getClassLoader() {
return cl;
}
}
public class MyClassLoader extends ClassLoader {
#Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
if (name.equals("com.abc.bootbycustomloader.controller.UserController")) {
// assump that UserController is the encrypted class
// i need to load this encrypted class, and decrypted it!
System.out.println("!!!!!encrypted!!!!! : " + name);
// load the class from a special place, mock the decrypted processing
String path = "D:\\_clz\\UserController.class";
byte[] data = new byte[0];
try {
data = Files.readAllBytes(Paths.get(path));
} catch (IOException e) {
e.printStackTrace();
}
// mock decrypted processing success, return the decrypted class
Class<?> clz = defineClass(name, data, 0, data.length);
return clz;
} else {
// assump that other class is not encrypted class
// just load it as usual
return super.loadClass(name);
}
}
}