SpringCloud 使用 Feign各 种报错

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.12.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
 
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.16.20</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
        <version>2.0.2.RELEASE</version>
    </dependency>
</dependencies>

//from fhadmin.cn
@EnableFeignClients
@SpringBootApplication
public class ClientApplication {
    public static void main(String[] args) {
        SpringApplication.run(ClientApplication.class,args);
    }
}

@FeignClient(
        name = "userService",
        url = "http://localhost:8081/api/server"
)
//from fhadmin.cn
public interface UserFeignClient {
    @RequestMapping(value = "/getUserInfo",method = RequestMethod.GET)
    @ResponseBody
    String getUserInfo();
}