SpringBoot+JPA做权限入Redis报错Could not read JSON: failed to lazily initialize a collection, could not in

最新推荐文章于 2023-01-05 11:57:16 发布
原创 最新推荐文章于 2023-01-05 11:57:16 发布 · 1.8k 阅读 · 1 ·
CC 4.0 BY-SA版权
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
文章标签：

#redis

本文解决了一个关于将JPA多对多权限系统数据存储到Redis时遇到的序列化错误问题，通过放弃使用Jackson2JsonRedisSerializer并采用字符串序列化方式，成功绕过了Hibernate LazyInitializationException异常。

报错背景：最近在做一个新项目，需要用到权限系统，用JPA做了多对多的权限系统，感觉到了后面权限多了之后会影响性能就想着把用户信息包括关联查询到的角色权限信息全都放到Redis中，可是出了这个问题了，可以存进去，但是获取的时候就会报错了。
报错信息：

org.springframework.data.redis.serializer.SerializationException: Could not read JSON: failed to lazily initialize a collection, could not initialize proxy - no Session (through reference chain: com.new3s.powermonitoring.commons.pojo.dto.UserDto["roles"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: failed to lazily initialize a collection, could not initialize proxy - no Session (through reference chain: com.new3s.powermonitoring.commons.pojo.dto.UserDto["roles"])
	at org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer.deserialize(Jackson2JsonRedisSerializer.java:75)
	at org.springframework.data.redis.core.AbstractOperations.deserializeValue(AbstractOperations.java:335)
	at org.springframework.data.redis.core.AbstractOperations$ValueDeserializingRedisCallback.doInRedis(AbstractOperations.java:61)
	at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:228)
	at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:188)
	at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:96)
	at org.springframework.data.redis.core.DefaultValueOperations.get(DefaultValueOperations.java:53)
	at com.new3s.powermonitoring.commons.utils.RedisUtil.get(RedisUtil.java:93)
	at com.new3s.powermonitoring.service.impl.UserServiceImpl.getUser(UserServiceImpl.java:77)
	at com.new3s.powermonitoring.service.impl.UserServiceImpl$$FastClassBySpringCGLIB$$d64ccb11.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:687)
	at com.new3s.powermonitoring.service.impl.UserServiceImpl$$EnhancerBySpringCGLIB$$5f86f4cf.getUser(<generated>)
	at com.new3s.powermonitoring.controller.UserController.getUser(UserController.java:42)
	at com.new3s.powermonitoring.controller.UserController$$FastClassBySpringCGLIB$$fad6283d.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:55)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:62)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
	at com.new3s.powermonitoring.commons.config.log.LogRecordAspect.doAround(LogRecordAspect.java:79)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
	at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
	at com.new3s.powermonitoring.controller.UserController$$EnhancerBySpringCGLIB$$4d933108.getUser(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:92)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92)
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: failed to lazily initialize a collection, could not initialize proxy - no Session (through reference chain: com.new3s.powermonitoring.commons.pojo.dto.UserDto["roles"])
	at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:397)
	at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:356)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.wrapAndThrow(BeanDeserializerBase.java:1714)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:295)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:156)
	at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer._deserialize(AsArrayTypeDeserializer.java:120)
	at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer.deserializeTypedFromAny(AsArrayTypeDeserializer.java:71)
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserializeWithType(UntypedObjectDeserializer.java:710)
	at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:68)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4482)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3538)
	at org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer.deserialize(Jackson2JsonRedisSerializer.java:73)
	... 126 more
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, could not initialize proxy - no Session
	at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:606)
	at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:218)
	at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:162)
	at org.hibernate.collection.internal.PersistentBag.size(PersistentBag.java:371)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:301)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:244)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:27)
	at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer._deserialize(AsArrayTypeDeserializer.java:120)
	at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer.deserializeTypedFromArray(AsArrayTypeDeserializer.java:53)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserializeWithType(CollectionDeserializer.java:313)
	at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:138)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:293)
	... 134 more

看了报错信息感觉是JPA的错，但是是在取Redis是报错的，怎么想都不应该是JPA的问题，果然上网一顿查一顿实验之后确定不是JPA的错，就是Redis序列化的问题，原因没有找到，不过我是这样解决的。

在修改代码之前我的Redis配置是这样的
在这里插入图片描述
业务代码里是这样的：
在这里插入图片描述
既然Jackson报错那就干脆不用它了，我把Redis配置里改成了这样
在这里插入图片描述
这样的话我再存入Redis的时候就把数据先转成json字符串，然后取出来再转回来就绕过这个问题了，虽然麻烦了点
在这里插入图片描述
这样就解决了这个问题，而且使用字符串序列化也灵活了很多

Springboot - 项目的全部可配置属性及其说明
简简单单Onlinezuozuo
04-11 9448
Springboot - 项目的全部可配置属性及其说明 1.可配置的项目如下 // 包含了可配置的字段， 默认值，以及说明 // 有机会后面翻译一下 debug=false # Enable debug logs. trace=false # Enable trace logs. # LOGGING logging.config= # Location of the logging c...
Spring Boot学习总结（8）——SpringBoot Common application properties（application.properties）详解
科技D人生
05-05 4114
各种属性可以在您的application.properties/application.yml文件或命令行开关指定。下面提供了常见的Spring启动属性和引用它们的基础类的列表。 # =================================================================== # COMMON SPRING BOOT PROPERTIES # # T
failed to lazily initialize a collection of role
Kevin的程序人生
01-16 1431
做Many-to-One的时候遇见的错误，级联检索不允许。failed to lazily initialize a collection of role: no session or session was closed试验了一下发现了几个解决方法：1、是把对应一对多的那两个列lazy=true改为lazy＝false即可2、对于查询中如果用的是xxx.load（class，id）则改为xxx,
org.springframework.data.redis.serializer.SerializationException: Could not read JSON
白桦栎的博客
11-05 2464
org.springframework.data.redis.serializer.SerializationException: Could not read JSON: failed to lazily initialize a collection, could not initialize proxy - no Session (through reference chain: com.o...
懒加载引起的程序异常(未解决)
D_AVICI的博客
12-10 699
这里写自定义目录标题欢迎使用Markdown编辑器新的改变功能快捷键合理的创建标题，有助于目录的生成如何改变文本的样式插入链接与图片如何插入一段漂亮的代码片生成一个适合你的列表创建一个表格设定内容居中、居左、居右SmartyPants创建一个自定义列表如何创建一个注脚注释也是必不可少的KaTeX数学公式新的甘特图功能，丰富你的文章UML 图表FLowchart流程图导出与导入导出导入 欢迎使用Markdown编辑器 今天用懒加载报的错,跪求路过的大佬指点 [srms-ums:192.168.0.:*] 20
springboot整合Redis-RedisTemplate设置序列化排坑之Could not read JSON: Unrecognized field "enabled"
热门推荐
ChuXinstyle的博客
01-08 1万+
springboot在整合Redis+spring-security时RedisTemplate设置完序列化后运行碰到报错Could not read JSON: Unrecognized field “enabled”，在网上查找资料后发现是在json序列化时，不仅是根据get方法来序列化的，而是实体类中所有的有返回值的方法都会将返回的值序列化，但是反序列化时是根据set方法来实现的，所以当实体...
由Hibernate 懒加载引起的问题 failed to lazily initialize a collection could not initialize proxy - no Session
ittubaozi的专栏
04-24 3860
为了增加系统的查询效率我在项目中配置了懒加载，配置如下： lazy ="true"表示在查询该实体类是先不关联查询<set>集合，只要当用到是在查询，这样避免了list()查询时的大量关联查询。但是当我查询该实体类详情时，也是需要展示这个<set>集合，却报下如下错误：failed to lazily initialize a collection could no...
failed to lazily initialize a collection of role: could not initialize proxy - no Session
二次加工是一种痛
07-21 3466
hibernate 中，在关联一对多时，默认懒加载，只会取dangqian
Spring Boot入门教程(四):配置文件
人不风流枉少年
03-20 4909
配置方式 每个starter都有自己默认的配置，如果需要改变默认值，可以在其他地方配置来覆盖掉默认的值，覆盖默认的配置有多种方式，每种方式的优先级也不同，如果在多个地方配置则优先使用优先级高的值，其中命令行参数优先级最高, 其中大部分参数一般都配置在属性文件application.properties中，属性文件即可以覆盖starter中默认的值，也可以自定义值 在命令行行输入的参数 SPR...
springboot配置文件application.properties中的配置项
SteveJobson
12-19 3418
# BANNER banner.charset=UTF-8 # Banner file encoding. banner.location=classpath:banner.txt # Banner file location. banner.image.location=classpath:banner.gif # Banner image file location (jpg/p
springboot中的配置大全，看这一篇足够了
我是Cj，一个正义之人
09-08 3466
springboot号称不用xml，所有都可以写配置，因而大受欢迎，这里我整理了一下springboot中的一些配置，应该说比较齐全了吧 先上一个application.properties转 application.yml的网站，传送地址 banner: charset: UTF-8＃横幅文件编码。 image: height: ＃字符中横幅图像的高度（默认为图像高度） invert: ＃如果黑暗终端主题的图像应该被反转（默认为false） location: classp
JPA-failed to lazily initialize a collection of role, could not initialize proxy - no Session
ssehs的博客
05-28 1255
前言 如果有两个对象，分别时OneSide和ManySide，它们满足一对多的关系，一个OneSide对应多个ManySide。通常我们在JPA中这么定义它们的关系： @Entity public class OneSide { @OneToMany(mappedBy = "oneSide") private Set<ManySide> manySides; } @Entity public class ManySide { @ManyToOne @JoinColumn p
解决: failed to lazily initialize a collection of role: XXX, could not initialize proxy - no Session
vaNaVnVan的博客
01-05 4986
failed to lazily initialize a collection of role: XXXXXXXX, could not initialize proxy - no Session问题解决方案
failed to lazily initialize a collection of role: com.xxxxx, could not initialize proxy - no Session
hyl999的专栏
09-25 3495
我的环境：spring boot 1.5.4 Spring Jpa+ Hibernate 在调用 @ManyToMany级联问题是出现下面错误： failed to lazily initialize a collection of role: com.xxxxx, could not initialize proxy - no Session 问题原因： 由于设置了延时加载，通过get...
多对多关联懒加载导致failed to lazily initialize a collection of role: 实体类, could not initialize proxy - no Ses...
weixin_30347335的博客
08-23 225
一篇文章需要关联很多个标签，所以他们呈一对多（多对多）的关系 org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.LazyInitializationException: failed to lazily i...
failed to lazily initialize a collection of role: com..., could not initialize proxy - no Session
chenyun19900528的博客
07-03 1496
net.sf.json.JSONException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.gwl.bos.model.Region...
failed to lazily initialize a collection of role，could not initialize proxy – no Session
_夜渐凉
09-03 3450
问题出在：could not initialize proxy – no Session at  无法初始化代理-没有session。   证明获取不到session，访问action的时候报了500错误， 配置懒加载一定要在web.xml开头配置代码，放在其他位置无效。   解决办法：这个是 由于web.xml没有配置懒加载。名词解析：延迟加载，也叫懒加载，它是Hibernate为提...
解决failed to lazily initialize a collection of role: XX ,could not initialize proxy - no Session
chenchuwai的博客
05-14 1532
报错：org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: XX, could not initialize proxy - no Session(未能惰性地初始化角色集合:XX，无法初始化代理-没有会话) 解决方法： 将 @OneToMany(fetch = FetchType.LAZY, orphanRemoval = true, cascade = CascadeTy.
使用springdatajpa报org.hibernate.LazyInitializationException: failed to lazily initialize a collection
qq_48129322的博客
04-27 331
使用springdatajpa报org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.cn.lw.demo.domian 项目场景： 当你使用使用springboot整合springdatajpa时，如果实体里面和其他实体有映射关系（即添加了其他实体类型）并且toString()方法中含有该实体，在测试时输出会报懒加载异常。 原因分析： springboot容器默认是懒
Resolved [org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: failed to lazily initialize a collection of role: com.rfxj.projects.swawp.risk2021.entity.StRiskGasDetail.permits, could not initialize proxy - no Session; nested exception is com.fasterxml.jackson.databind.JsonMappingException: failed to lazily initialize a collection of role: com.rfxj.projects.swawp.risk2021.entity.StRiskGasDetail.permits, could not initialize proxy - no Session (through reference chain: java.util.Collections$SynchronizedMap["gasList"]->java.util.ArrayList[0]->com.rfxj.projects.swawp.risk2021.entity.StRiskGasDetail["permits"])]
最新发布
10-11
<think>我们正在处理一个典型的Hibernate懒加载异常，具体表现为在JSON序列化过程中，由于会话已关闭，导致无法初始化代理对象（懒加载集合）。以下将详细解释原因并提供多种解决方案。 </think>### Hibernate懒加载导致JSON序列化失败的原因与解决方案 #### 问题原因分析 出现`HttpMessageNotWritableException`的根本原因是**在Hibernate会话关闭后尝试访问懒加载(Lazy Loading)集合**[^1]，具体表现为： ```java Failed to lazily initialize a collection of role: com.rfxj.projects.swawp.risk2021.entity.StRiskGasDetail.permits, could not initialize proxy - no Session ``` **核心机制**： 1. **懒加载策略**：Hibernate默认对集合使用`FetchType.LAZY`，仅当首次访问时才加载数据 2. **会话生命周期**：JSON序列化发生在`@Transactional`事务边界之外，此时Session已关闭 3. **代理对象陷阱**：集合实际是Hibernate代理对象，序列化时触发数据加载但无可用Session 数学表达该过程： $$ \text{序列化触发} \implies \text{代理对象初始化} \implies \require{cancel} \cancel{\text{Session存在}} \implies \text{异常} $$ #### 解决方案 ##### 方案1：调整抓取策略（推荐） ```java @Entity public class StRiskGasDetail { @OneToMany(fetch = FetchType.EAGER) // 改为立即加载 @JoinColumn(name = "gas_detail_id") private Set<Permit> permits = new HashSet<>(); } ``` **优点**：简单直接 **缺点**：可能引起N+1查询问题[^2] ##### 方案2：DTO投影（最佳实践） ```java public class GasDetailDTO { private Long id; private Set<PermitDTO> permits; // 自定义DTO避免懒加载 public GasDetailDTO(StRiskGasDetail entity) { this.id = entity.getId(); this.permits = entity.getPermits().stream() .map(PermitDTO::new) .collect(Collectors.toSet()); } } // Controller层 @GetMapping public GasDetailDTO getDetail(String id) { return new GasDetailDTO(service.findById(id)); } ``` ##### 方案3：事务扩展到视图层（谨慎使用） ```properties # application.properties spring.jpa.open-in-view=true ``` **风险**：可能导致长事务和连接池耗尽[^3] ##### 方案4：Hibernate.initialize()主动加载 ```java @Transactional public StRiskGasDetail findDetail(String id) { StRiskGasDetail detail = repository.findById(id).orElseThrow(); Hibernate.initialize(detail.getPermits()); // 强制初始化集合 return detail; } ``` ##### 方案5：JSON序列化过滤器 ```java @Bean public Jackson2ObjectMapperBuilder objectMapperBuilder() { return new Jackson2ObjectMapperBuilder() .failOnEmptyBeans(false) .serializationInclusion(JsonInclude.Include.NON_NULL) .modules(new Hibernate5Module()); // 忽略懒加载属性 } ``` #### 性能对比方案 | 方案 | 内存占用 | 查询次数 | 事务时长 | 适用场景 | |------|----------|----------|----------|----------| | EAGER抓取 | 高 | 1+N | 短 | 小型关联数据 | | DTO投影 | 中 | 优化为1 | 短 | 中大型系统 | | open-in-view | 低 | 动态增加 | 长 | 遗留系统改造 | | Hibernate.initialize | 中 | 可控 | 中 | 特定业务场景 | #### 调试建议 1. 启用Hibernate SQL日志： ```properties spring.jpa.show-sql=true logging.level.org.hibernate.SQL=DEBUG ``` 2. 使用调试断点验证集合初始化时机 3. 监控事务边界：`@Transactional`注解位置是否正确 > 推荐优先方案2（DTO投影），在保证性能的同时避免懒加载陷阱。对于超大集合（>1000条），建议采用分页机制[^2]。
评论 2
成就一亿技术人!
拼手气红包6.0元
还能输入1000个字符
 
红包 添加红包
表情包 插入表情
表情包 代码片
 条评论被折叠 查看
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包

打赏作者

老鼠抗刀

你的鼓励将是我创作的最大动力

¥1 ¥2 ¥4 ¥6 ¥10 ¥20
扫码支付：¥1
获取中
扫码支付

您的余额不足，请更换扫码支付或充值

打赏作者

实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值