We use spring data rest annotating repositories with @RepositoryRestResource which provides CRUD apis by default. In spring boot 2.7.3 which we currently use, delete api returns 204 no content but in spring boot 3.1.8 upgrade, delete api response code changed to 200 ok. This is causing issues as the associated entities were not available after the session is closed but spring trying to return a GET 200 OK response.

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘entityManagerFactory’ defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Association ‘com.developer.soumya.model.Author.books’ is ‘mappedBy’ a property named ‘category’ which references the wrong entity type ‘com.developer.soumya.model.Category’, expected ‘com.developer.soumya.model.Author’
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1786) ~[spring-beans-6.1.6.jar:6.1.6]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:600) ~[spring-beans-6.1.6.jar:6.1.6]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522) ~[spring-beans-6.1.6.jar:6.1.6]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[spring-beans-6.1.6.jar:6.1.6]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.6.jar:6.1.6]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[spring-beans-6.1.6.jar:6.1.6]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-6.1.6.jar:6.1.6]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1234) ~[spring-context-6.1.6.jar:6.1.6]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:952) ~[spring-context-6.1.6.jar:6.1.6]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:624) ~[spring-context-6.1.6.jar:6.1.6]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.2.5.jar:3.2.5]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-3.2.5.jar:3.2.5]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456) ~[spring-boot-3.2.5.jar:3.2.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:334) ~[spring-boot-3.2.5.jar:3.2.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354) ~[spring-boot-3.2.5.jar:3.2.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-3.2.5.jar:3.2.5]
at com.developer.soumya.JpaRelationApplication.main(JpaRelationApplication.java:10) ~[classes/:na]
Caused by: org.hibernate.AnnotationException: Association ‘com.developer.soumya.model.Author.books’ is ‘mappedBy’ a property named ‘category’ which references the wrong entity type ‘com.developer.soumya.model.Category’, expected ‘com.developer.soumya.model.Author’
at org.hibernate.boot.model.internal.BinderHelper.checkMappedByType(BinderHelper.java:1126) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.boot.model.internal.CollectionBinder.isReversePropertyInJoin(CollectionBinder.java:1625) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.boot.model.internal.CollectionBinder.noAssociationTable(CollectionBinder.java:1636) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.boot.model.internal.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:1597) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.boot.model.internal.CollectionBinder$1.secondPass(CollectionBinder.java:1588) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.boot.model.internal.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:45) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1815) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1774) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:332) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1432) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1503) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:75) ~[spring-orm-6.1.6.jar:6.1.6]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:390) ~[spring-orm-6.1.6.jar:6.1.6]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-6.1.6.jar:6.1.6]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-6.1.6.jar:6.1.6]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:366) ~[spring-orm-6.1.6.jar:6.1.6]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1833) ~[spring-beans-6.1.6.jar:6.1.6]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782) ~[spring-beans-6.1.6.jar:6.1.6]
… 16 common frames omitted