After upgrading to Spring boot 3 (and Hibernate 6), I encountered some issues regarding save methods, but only at the entities that have within them fields annotated with @OneToMany or @ManyToOne. They would simply throw this exception:

Servlet.service() for servlet [dispatcherServlet] in context with path [/test-portal] threw exception [Handler dispatch failed: java.lang.NoSuchMethodError: 'org.hibernate.proxy.LazyInitializer org.hibernate.proxy.HibernateProxy.extractLazyInitializer(java.lang.Object)'] with root cause
"java.lang.NoSuchMethodError: 'org.hibernate.proxy.LazyInitializer org.hibernate.proxy.HibernateProxy.extractLazyInitializer(java.lang.Object)'
    at org.hibernate.envers.internal.entities.mapper.id.SingleIdMapper.mapToMapFromEntity(SingleIdMapper.java:106) ~[hibernate-envers-6.1.6.Final.jar:6.1.6.Final]
    at org.hibernate.envers.internal.entities.mapper.relation.ToOneIdMapper.mapToMapFromEntity(ToOneIdMapper.java:80) ~[hibernate-envers-6.1.6.Final.jar:6.1.6.Final]
    at org.hibernate.envers.internal.entities.mapper.MultiPropertyMapper.map(MultiPropertyMapper.java:92) ~[hibernate-envers-6.1.6.Final.jar:6.1.6.Final]
    at org.hibernate.envers.internal.synchronization.work.ModWorkUnit.<init>(ModWorkUnit.java:42) ~[hibernate-envers-6.1.6.Final.jar:6.1.6.Final]
    at org.hibernate.envers.event.spi.EnversPostUpdateEventListenerImpl.onPostUpdate(EnversPostUpdateEventListenerImpl.java:46) ~[hibernate-envers-6.1.6.Final.jar:6.1.6.Final]
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireLazyEventOnEachListener(EventListenerGroupImpl.java:96) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.action.internal.EntityUpdateAction.postUpdate(EntityUpdateAction.java:289) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:247) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:612) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.engine.spi.ActionQueue.lambda$executeActions$1(ActionQueue.java:483) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:721) ~[na:na]
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:480) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:329) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1422) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:476) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:2233) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:1929) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:439) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:183) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:281) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:101) ~[hibernate-core-6.1.5.Final.jar:6.1.5.Final]
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:562) ~[spring-orm-6.0.2.jar:6.0.2]
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:743) ~[spring-tx-6.0.2.jar:6.0.2]
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:711) ~[spring-tx-6.0.2.jar:6.0.2]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:654) ~[spring-tx-6.0.2.jar:6.0.2]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:407) ~[spring-tx-6.0.2.jar:6.0.2]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-6.0.2.jar:6.0.2]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.0.2.jar:6.0.2]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) ~[spring-tx-6.0.2.jar:6.0.2]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.0.2.jar:6.0.2]
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:163) ~[spring-data-jpa-3.0.0.jar:3.0.0]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.0.2.jar:6.0.2]
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-6.0.2.jar:6.0.2]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.0.2.jar:6.0.2]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:218) ~[spring-aop-6.0.2.jar:6.0.2]
    at jdk.proxy5/jdk.proxy5.$Proxy534.save(Unknown Source) ~[na:na]
    at mypack.controller.finalexamination.FinalExaminationController.saveBachelorExaminee(FinalExaminationController.java:282) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:207) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:152) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:884) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1080) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:973) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1003) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:906) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:731) ~[tomcat-embed-core-10.1.1.jar:6.0]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:880) ~[spring-webmvc-6.0.2.jar:6.0.2]
    at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:814) ~[tomcat-embed-core-10.1.1.jar:6.0]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:223) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:397) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:295) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:79) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:125) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:100) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.oauth2.server.resource.web.authentication.BearerTokenAuthenticationFilter.doFilterInternal(BearerTokenAuthenticationFilter.java:128) ~[spring-security-oauth2-resource-server-6.0.0.jar:6.0.0]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.authentication.ui.DefaultLogoutPageGeneratingFilter.doFilterInternal(DefaultLogoutPageGeneratingFilter.java:58) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter.doFilter(DefaultLoginPageGeneratingFilter.java:188) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter.doFilter(DefaultLoginPageGeneratingFilter.java:174) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:227) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:221) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.oauth2.client.web.OAuth2AuthorizationRequestRedirectFilter.doFilterInternal(OAuth2AuthorizationRequestRedirectFilter.java:181) ~[spring-security-oauth2-client-6.0.0.jar:6.0.0]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.context.SecurityContextHolderFilter.doFilterInternal(SecurityContextHolderFilter.java:69) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:173) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:185) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:278) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:170) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:134) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191) ~[spring-security-web-6.0.0.jar:6.0.0]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:351) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267) ~[spring-web-6.0.2.jar:6.0.2]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:109) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.0.2.jar:6.0.2]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.2.jar:6.0.2]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:119) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:400) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1739) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-10.1.1.jar:10.1.1]
    at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

The method that I use is the default one from CrudRepository, and the problem doesn't appear to simple classes (that have no relations with other tables).

@Entity
@Audited
@Table(name = "PERSON_ERREICHBARKEITEN", schema = "BO")
@SequenceGenerator(name = "SQPERSERR", sequenceName = "BO.SQ_PERSERR", allocationSize = 1)
public class PersonErreichbarkeiten implements java.io.Serializable {

    private static final long serialVersionUID = 1081774833289787891L;

    private Long id;
    private Personen personen;
    private ErreichbarkeitArtenH erreichbarkeitArtenH;

        public PersonErreichbarkeiten() {
        this.primaer = 0l;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SQPERSERR")
    @Column(name = "ID", unique = true, nullable = false, insertable = false, updatable = false)
    public Long getId() {
        return this.id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "PERS_ID", nullable = false)
    public Personen getPersonen() {
        return this.personen;
    }

    public void setPersonen(Personen personen) {
        this.personen = personen;
    }

    @ManyToOne
    @JoinColumn(name = "ERRART_ID", nullable = false)
    @Audited(targetAuditMode = RelationTargetAuditMode.NOT_AUDITED)
    public ErreichbarkeitArtenH getErreichbarkeitArtenH() {
        return this.erreichbarkeitArtenH;
    }

    public void setErreichbarkeitArtenH(ErreichbarkeitArtenH erreichbarkeitArtenH) {
        this.erreichbarkeitArtenH = erreichbarkeitArtenH;
    }

}
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hibernate-envers and hibernate-core versions must match. You are trying to use 6.1.6 with 6.1.5 which is not possible.