I'm trying to set up the simplest hibernate configuration for one class, then save one object of that class to DB.

My setup is following: Spring, hibernate and in memory H2 DB

Configuration:

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        ".0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.url">jdbc:h2:mem:testdb</property>
        <property name="hibernate.connection.username">sa</property>
        <property name="hibernate.connection.password">password</property>
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.connection.driver_class">org.h2.Driver</property>
        <property name="hibernate.dialect">org.hibernate.dialect.H2Dialect</property>

        <mapping resource="Identity.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

Identity.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        ".0.dtd"
       >
<hibernate-mapping>
    <class name="com.ami.iscroleexpander.entity.Identity">

        <id name="id" length="255" column="id"/>

        <property name="name" type="string" length="255"/>
        <property name="alias" type="string" length="255"/>
    </class>
</hibernate-mapping>

Identity.java

package com.ami.iscroleexpander.entity;

import com.amidentity.isctf.object.JsonObject;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

//@Entity
@JsonIgnoreProperties(ignoreUnknown=true)
public class Identity extends JsonObject {

    private static final Logger log = LogManager.getLogger(Identity.class);

    private String id;
    private String name;
    private String alias;

    public Identity() {
        super();
    }
    public String getAlias() {
        return alias;
    }

    public void setAlias(String alias) {
        this.alias = alias;
    }
    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

The execution code I use to test this:

Identity newIdentity = modelMapper.map(identityDto, Identity.class);
log.trace("Updated identity: {}", newIdentity.toJson());
            var sessionFactory = new Configuration().configure().buildSessionFactory();
            var session = sessionFactory.openSession();
            session.beginTransaction();
            session.persist(newIdentity);
            session.getTransaction()mit();
            session.close();

On persist I get following exception:

2025-01-05 23:56:31.172 ERROR 37084 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[.[dispatcherServlet]      : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.RuntimeException: org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling: 'com.ami.iscroleexpander.entity.Identity.id' (getter)] with root cause

java.lang.IllegalArgumentException: object is not an instance of declaring class
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
    at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
    at org.hibernate.property.access.spi.GetterMethodImpl.get(GetterMethodImpl.java:48) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.metamodel.mapping.internal.BasicEntityIdentifierMappingImpl.getIdentifier(BasicEntityIdentifierMappingImpl.java:158) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4569) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4127) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:293) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.event.internal.EntityState.getEntityState(EntityState.java:62) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.event.internal.DefaultPersistEventListener.entityState(DefaultPersistEventListener.java:112) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.event.internal.DefaultPersistEventListener.persist(DefaultPersistEventListener.java:85) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:77) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:54) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:127) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:757) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:741) ~[hibernate-core-6.5.3.Final.jar:6.5.3.Final]
    at com.ami.iscroleexpander.service.ISCReaderService.saveOrUpdateIdentity(ISCReaderService.java:191) ~[main/:?]
    at com.ami.iscroleexpander.service.ISCReaderService.lambda$readIdentitiesFromIsc$23(ISCReaderService.java:117) ~[main/:?]
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[?:?]
    at com.ami.iscroleexpander.service.ISCReaderService.readIdentitiesFromIsc(ISCReaderService.java:115) ~[main/:?]
    at com.ami.iscroleexpander.controller.ObjectsController.synchronize(ObjectsController.java:80) ~[main/:?]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
    at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:255) ~[spring-web-6.1.13.jar:6.1.13]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:188) ~[spring-web-6.1.13.jar:6.1.13]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:926) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:831) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:590) ~[tomcat-embed-core-10.1.30.jar:6.0]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.13.jar:6.1.13]
    at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.30.jar:6.0]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.13.jar:6.1.13]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.13.jar:6.1.13]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.13.jar:6.1.13]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.13.jar:6.1.13]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.13.jar:6.1.13]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.13.jar:6.1.13]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:384) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:905) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.tomcat.util.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1741) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.tomcat.util.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) [tomcat-embed-core-10.1.30.jar:10.1.30]
    at java.base/java.lang.Thread.run(Thread.java:833) [?:?]

This should be simplest thing to do. I initially did this using annotations and it was working correctly.

oh and my spring application.properties

spring.application.name=ISCRoleExpander

spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

spring.jpa.defer-datasource-initialization=true

spring.h2.console.enabled=true

schema.sql

create table Identity(
  ID varchar(255) not null,
  NAME varchar(255),
  ALIAS varchar(255),
  PRIMARY KEY ( ID )
);

I tried using annotation instead of xml for hibernate configuration and that worked fine but need to use XML so it can be customized simply by my clients. The expectation is that there is no exception and that record is save to the DB.