一、No serializer found for class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor
详细报错
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.example.sbjdemo.pojo.User["car"]->com.example.sbjdemo.pojo.Car$HibernateProxy$CCqaurKR["hibernateLazyInitializer"])
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77) ~[jackson-databind-2.13.5.jar:2.13.5]
at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1300) ~[jackson-databind-2.13.5.jar:2.13.5]
at com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:400) ~[jackson-databind-2.13.5.jar:2.13.5]
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:46) ~[jackson-databind-2.13.5.jar:2.13.5]
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:29) ~[jackson-databind-2.13.5.jar:2.13.5]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.13.5.jar:2.13.5]
...........
触发场景
当fetch设置为懒加载的时候（fetch = FetchType.LAZY），进行查询操作
错误原因
car在转化为json的时候，序列化失败了（大概就是这个意思吧）
解决办法
在序列化失败的实体类上添加 @JsonIgnoreProperties(value = {"hibernateLazyInitializer"})
二、java.lang.StackOverflowError: null
详细报错
java.lang.StackOverflowError: null
at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_212]
at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[na:1.8.0_212]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_212]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468) ~[na:1.8.0_212]
at java.net.URLClassLoader.access$100(URLClassLoader.java:74) ~[na:1.8.0_212]
at java.net.URLClassLoader$1.run(URLClassLoader.java:369) ~[na:1.8.0_212]
at java.net.URLClassLoader$1.run(URLClassLoader.java:363) ~[na:1.8.0_212]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_212]
触发场景
两个关联的实体类都有外键字段，且都有关联注解，如：@OneToOne、@OneToManay、@ManyToOne、@ManyToMany
错误原因
两个相关联的对象互相调用并打印，形成一个递归调用，最后堆栈溢出
解决办法
两个关联的实体中的关联对象上，都加上一个 @JsonIgnore 注解，表示在序列化的时候，忽略这个属性（网上有说@ToString(exclude={"userList"})可以规避，但是我没有测试成功，大家可以自己试一下）
如下图所示
@OneToOne
@JoinColumn(name = "car_id")
@JsonIgnore
private Car car;
三、No class com.example.sbjdemo.pojo.User entity with id 18 exists!
详细报错
org.springframework.dao.EmptyResultDataAccessException: No class com.example.sbjdemo.pojo.User entity with id 18 exists!
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.lambda$deleteById$0(SimpleJpaRepository.java:173) ~[spring-data-jpa-2.7.10.jar:2.7.10]
at java.util.Optional.orElseThrow(Optional.java:290) ~[na:1.8.0_212]
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.deleteById(SimpleJpaRepository.java:172) ~[spring-data-jpa-2.7.10.jar:2.7.10]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_212]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_212]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_212]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_212]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:289) ~[spring-data-commons-2.7.10.jar:2.7.10]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.7.10.jar:2.7.10]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.7.10.jar:2.7.10]
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:530) ~[spring-data-commons-2.7.10.jar:2.7.10]
触发场景
执行数据删除操作
错误原因
删除的数据在数据库中不存在
四、object references an unsaved transient instance - save the transient instance before flushing
报错详情
org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.example.sbjdemo.pojo.User.car -> com.example.sbjdemo.pojo.Car
at org.hibernate.engine.spi.CascadingActions$8.noCascade(CascadingActions.java:379) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:169) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:159) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:149) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:82) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1407) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:489) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3303) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2438) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:449) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:183) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:40) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:281) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:101) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:562) ~[spring-orm-5.3.26.jar:5.3.26]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:743) ~[spring-tx-5.3.26.jar:5.3.26]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:711) ~[spring-tx-5.3.26.jar:5.3.26]
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:654) ~[spring-tx-5.3.26.jar:5.3.26]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:407) ~[spring-tx-5.3.26.jar:5.3.26]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.26.jar:5.3.26]
触发场景
对实体对象执行 save 操作的时候。
错误原因
注解中的 CascadeType 未使用 CascadeType.PERSIST 或者 CascadeType.ALL。
解决办法
注解中的 CascadeType 使用 CascadeType.PERSIST 或者 CascadeType.ALL
五、 Not supported for DML operations [delete from com.example.sbjdemo.pojo.User u where u.id = :id]
报错详情
org.hibernate.hql.internal.QueryExecutionRequestException: Not supported for DML operations [delete from com.example.sbjdemo.pojo.User u where u.id = :id]
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.errorIfDML(QueryTranslatorImpl.java:319) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:370) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:218) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1459) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1649) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1617) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
触发场景
使用 @Query 进行删除数据的时候
@Query(value = "delete from User u where u.id = :id")
void deleteByIdQuery(int id);
解决办法
在触发场景的对应接口上添加 @Modifying 注解
@Modifying
@Query(value = "delete from User u where u.id = :id")
void deleteByIdQuery(int id);
六、javax.persistence.TransactionRequiredException: Executing an update/delete query
报错详情
javax.persistence.TransactionRequiredException: Executing an update/delete query
at org.hibernate.internal.AbstractSharedSessionContract.checkTransactionNeededForUpdateOperation(AbstractSharedSessionContract.java:445) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.hibernate.query.internal.AbstractProducedQuery.executeUpdate(AbstractProducedQuery.java:1692) ~[hibernate-core-5.6.15.Final.jar:5.6.15.Final]
at org.springframework.data.jpa.repository.query.JpaQueryExecution$ModifyingExecution.doExecute(JpaQueryExecution.java:241) ~[spring-data-jpa-2.7.10.jar:2.7.10]
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:90) ~[spring-data-jpa-2.7.10.jar:2.7.10]
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:156) ~[spring-data-jpa-2.7.10.jar:2.7.10]
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:144) ~[spring-data-jpa-2.7.10.jar:2.7.10]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.7.10.jar:2.7.10]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.7.10.jar:2.7.10]
触发场景
使用 @Query 进行删除数据的时候
@Modifying
@Query(value = "delete from User u where u.id = :id")
void deleteByIdQuery(int id);
解决办法
在触发场景的对应接口上添加 @Transactional 注解
@Modifying
@Transactional
@Query(value = "delete from User u where u.id = :id")
void deleteByIdQuery(int id);
