jackson 关联关系序列化常用的注解，解决死循环，JSON常见的异常问题

[zhangzhenhuajack]

这报错就一直报 No serializer found for class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.example.demo.User["role"]

解决方法入下：

1. spring.jackson.serialization.FAIL_ON_EMPTY_BEANS=false

2. 配置ObjectMapper

@Bean
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
    MappingJackson2HttpMessageConverter converter = 
        new MappingJackson2HttpMessageConverter(mapper);
    return converter;
}

https://stackoverflow.com/questions/28862483/spring-and-jackson-how-to-disable-fail-on-empty-beans-through-responsebody

[zhangzhenhuajack]

循环引用问题：@JsonManagedReference and @JsonBackReference

public class User {
    public int id;
    public String name;

    @JsonManagedReference
    public List<Item> userItems;
}
public class Item {
    public int id;
    public String itemName;

    @JsonBackReference
    public User owner;
}

https://www.baeldung.com/jackson-bidirectional-relationships-and-infinite-recursion