SpringBoot报错 The bean ‘xxxImpl’ could not be injected as a ‘com.xxx.service.impl.xxxServiceImpl’ because it is a JDK dynamic proxy that implements: com.xxx.service.xxxService

问题描述

项目在注入Service时报出动态代理错误问题，如果在自动装配的时候直接以实现类来声明变量，会出现CGLib错误。

例如，在UserController类里自动装配了UserServiceImpl类型的变量：

@Autowired
UserServiceImpl userService;

@RequestMapping("/xxx")
public Result xxx() {
	// 调用方法
	userService.fun();
}

那么运行的时候就会报错：

***************************
APPLICATION FAILED TO START
***************************

Description:

The bean 'userServiceImpl' could not be injected as a 'com.xxx.service.impl.UserServiceImpl' because it is a JDK dynamic proxy that implements:
	com.xxx.service.UserService


Action:

Consider injecting the bean as one of its interfaces or forcing the use of CGLib-based proxies by setting proxyTargetClass=true on @EnableAsync and/or @EnableCaching.

解决方法

一般注入的时候都是使用接口进行装配。如果需要在Service里扩展方法，可以现在接口里声明抽象类，实现类在实现方法即可。

接口声明抽象方法：

public interface UserService extends IService<User> {
    User getUserByName(String username);
}

实现类覆写方法：

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
    @Override
    public User getUserByName(String username) {
        return getOne(new QueryWrapper<User>().eq("username", username));
    }
}

自动装配：

@Autowired
UserService userService;

使用以接口类型声明的变量，再次调用就没问题啦！