无法向Spring Data Starter项目添加第二个实体

我从https://spring.io/guides/gs/accessing-data-jpa/获得了Spring Data JPA入门项目。我可以创建Customer和CustomerRepository类，并使Customer实体持久化。

但是，当我添加另一个实体Person和aPersonRepository并尝试保留该实体时，出现如下所示的错误。就像在内部Application.java某种内部类中$1，Spring数据试图将其映射为一个实体。

java.lang.IllegalArgumentException：未知实体：hello.Application $ 1

package hello;

import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
@ToString
@NoArgsConstructor
@Data
public class Person {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private int age;
}

package hello;

import org.springframework.data.repository.CrudRepository;

public interface PersonRepository extends CrudRepository<Person, Long> {
}

package hello;

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
@Slf4j
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }

    /*
    @Bean
    public CommandLineRunner demo(CustomerRepository repository) {
        return (args) -> {
            repository.save(new Customer("Jack", "Bauer"));
            repository.save(new Customer("Chole", "O'Brian"));
            repository.save(new Customer("Kim", "Bauer"));
            repository.save(new Customer("David", "Palmer"));
            repository.save(new Customer("Michelle", "Dessler"));

            // fetch all customers
            log.info("Customers found with findAll():");
            log.info("-------------------------------");
            repository.findAll().forEach(c -> log.info(c.toString()));
        };
    }
    */

    @Bean
    public CommandLineRunner demo(PersonRepository repository) {
        return (args) -> {
            repository.save(new Person(){{
                setAge(20);
            }});

            // fetch all customers
            log.info("Customers found with findAll():");
            log.info("-------------------------------");
            repository.findAll().forEach(c -> log.info(c.toString()));
        };
    }
}

申请费$ 1; 嵌套异常是java.lang.IllegalArgumentException：未知实体：hello.Application $ 1，位于org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible（EntityManagerFactoryUtils.java:373）〜[spring-orm-5.1.8.RELEASE.jar：5.1 .8.RELEASE]在org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible（HibernateJpaDialect.java:255）〜[spring-orm-5.1.8.RELEASE.jar：5.1.8.RELEASE]在org.springframework .orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible（AbstractEntityManagerFactoryBean.java:527）〜[spring-orm-5.1.8.RELEASE.jar：5.1.8.RELEASE] at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible（ChainedPersistenceExceptionTranslator。 java：61）〜[spring-tx-5.1.8.RELEASE.jar：5.1.8.RELEASE]，位于org.springframework.dao.support。