JPA(Hibernate)代理类的hibernateLazyInitializer属性系列化异常
2021-03-04 08:29
标签：proxy tor 持久化 new 行数据 bsp json 一个 data 今天在Spring Boot项目中使用JPA(Hibernate)进行数据库访问时， 查询一个实体对象时出现异常： 仔细看了下报错信息，发现直接原因是：jackson在对hibernate的持久化实体类的代理对象进行序列化时，代理类中的"hibernateLazyInitializer"属性为空，触发了系列化规划SerializationFeature.FAIL_ON_EMPTY_BEANS，即“出现空Bean时触发序列化失败”！ "hibernateLazyInitializer"属性为空之所以为空是因为我们禁用了延迟加载（open-in-view: true），设为false又会引发no Session错误。 报错信息中告诉我们可以通过禁用jackson的SerializationFeature.FAIL_ON_EMPTY_BEANS这条系列化规则来避免该异常(异常信息中的红色字所示)，我们可以通过以下方式使用禁用了SerializationFeature.FAIL_ON_EMPTY_BEANS规则的新ObjectMapper替换默认的ObjectMapper的方法来达到目的： 当然，也可以直接在相应的要实体类上通过@JsonIgnoreProperties忽略掉为空的属性的系列化： 下面来看一下两种方法重到的系列化结果样例： JPA(Hibernate)代理类的hibernateLazyInitializer属性系列化异常 标签：proxy tor 持久化 new 行数据 bsp json 一个 data 原文地址：https://www.cnblogs.com/xuruiming/p/13264245.htmlspring:
jpa:
generate-ddl: false
show-sql: true
hibernate:
ddl-auto: none
open-in-view: true
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: 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.xgclassroom.model.User$HibernateProxy$PpGM4JxY["hibernateLazyInitializer"])
@SpringBootApplication
@Configuration
public class ProviderUserApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderUserApplication.class, args);
}
@Bean
public ObjectMapper objectMapper() {
return new ObjectMapper().disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
}
}
@Getter
@Setter
@Entity
@JsonIgnoreProperties(value = {"hibernateLazyInitializer"})
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column
private String username;
@Column
private String name;
@Column
private Integer age;
@Column
private BigDecimal balance;
}
{"id":1,"username":"account1","name":"张三","age":20,"balance":100.00,"hibernateLazyInitializer":{}}
{"id":1,"username":"account1","name":"张三","age":20,"balance":100.00}
文章标题：JPA(Hibernate)代理类的hibernateLazyInitializer属性系列化异常
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