在Spring Boot REST中无法从Hibernate POJO返回JSON

Question

我正在尝试使用Spring Boot创建一个基本的REST服务，该服务返回使用Hibernate从数据库创建的POJO，然后将其转换为JSON并返回到REST调用。

我可以将常规的非Hibernate POJO作为JSON返回，但是对于Hibernate对象，我会遇到以下错误：

Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.example.springboottest.model.Person_$$_jvst48e_0["handler"])

这是我的代码：

人.java

@Entity
@Table(name = "people")
public class Person implements Serializable {

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

private String nameLast;
private String nameFirst;

@Temporal(TemporalType.DATE)
private Date dob;

protected Person(){}

public Person(String nameLast, String nameFirst, Date dob) {
    this.nameLast = nameLast;
    this.nameFirst = nameFirst;
    this.dob = dob;
}

// Getters and Setters...

PersonRepository.java

@Repository
public interface PersonRepository extends JpaRepository<Person, Long>{

}

PersonController.java

@RestController
public class PersonController {

    @Autowired
    PersonRepository personRepository;

    @GetMapping("/person/{id:\\d+}")
    public Person getPersonByID(@PathVariable long id){
        return personRepository.getOne(id);
    }
}

如果有人可以帮助我理解为什么它不起作用，将不胜感激。谢谢！

Answer 1

事实证明，这都是我使用错误方法造成的。如果我替换return personRepository.getOne(id)为return personRepository.findOne(id)，这将完美地工作。我不明白为什么getOne()不起作用，但这确实解决了问题。