如何让Spring Boot只扫描和验证导入的实体？

@EntityScan("com.example.entity")
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

public class User {
    @NotNull
    @Size(min = 2, max = 20)
    private String username;

    // getter and setter methods
}

import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Validated
public class UserController {
    @PostMapping("/users")
    public void createUser(@Valid @RequestBody User user) {
        // 处理用户创建逻辑
    }
}