When I am using Hibernate 5 with the DB2 column definition XML and I try to persist a entity class into the database I get the following error:

javax.ejb.EJBTransactionRolledbackException: nested exception is: javax.ejb.EJBException: CWNEN0030E: The server was unable to obtain an object instance for the java:comp/env/XXX/em reference. The exception message was: javax.persistence.PersistenceException: [PersistenceUnit: XXX] Unable to build Hibernate SessionFactory; nested exception is: java.lang.RuntimeException: javax.persistence.PersistenceException: [PersistenceUnit: XXX] Unable to build Hibernate SessionFactory
at com.ibm.ejs.container.BusinessExceptionMappingStrategy.mapCSIException(BusinessExceptionMappingStrategy.java:152)
at com.ibm.ejs.container.BusinessExceptionMappingStrategy.mapCSITransactionRolledBackException(BusinessExceptionMappingStrategy.java:613)
at com.ibm.ejs.container.EJSDeployedSupport.mapCSITransactionRolledBackException(EJSDeployedSupport.java:602)
at com.ibm.ejs.container.EJSContainer.postInvokeRolledbackException(EJSContainer.java:4382)
at com.ibm.ejs.container.EJSContainer.postInvoke(EJSContainer.java:4073)
at sun.reflect.GeneratedMethodAccessor211.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at com.ibm.ejs.container.TimedObjectWrapper.invokeCallback(TimedObjectWrapper.java:103)
at com.ibm.ejs.container.TimerNpRunnable.doWork(TimerNpRunnable.java:184)
at com.ibm.ejs.container.TimerNpRunnable.run(TimerNpRunnable.java:91)
at com.ibm.ejs.container.TimerNpAlarmListener.fired(TimerNpAlarmListener.java:102)
at com.ibm.ws.asynchbeans.AlarmImpl.callListenerMethod(AlarmImpl.java:402)
at com.ibm.ws.asynchbeans.timer.GenericTimer.run(GenericTimer.java:229)
at com.ibm.ws.asynchbeans.J2EEContext$RunProxy.run(J2EEContext.java:277)
at java.security.AccessController.doPrivileged(AccessController.java:664)
at javax.security.auth.Subject.doAs(Subject.java:488)
at com.ibm.websphere.security.auth.WSSubject.doAs(WSSubject.java:133)
at com.ibm.websphere.security.auth.WSSubject.doAs(WSSubject.java:91)
at com.ibm.ws.asynchbeans.J2EEContext$DoAsProxy.run(J2EEContext.java:348)
at java.security.AccessController.doPrivileged(AccessController.java:694)
at com.ibm.ws.asynchbeans.J2EEContext.run(J2EEContext.java:1042)
at com.ibm.ws.asynchbeans.AlarmImpl.runListenerAsCJWork(AlarmImpl.java:234)
at com.ibm.ws.asynchbeans.am._Alarm.fireAlarm(_Alarm.java:340)
at com.ibm.ws.asynchbeans.am._Alarm.run(_Alarm.java:237)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1909)
Caused by: javax.ejb.EJBException: CWNEN0030E: The server was unable to obtain an object instance for the java:comp/env/XXX/em reference. The exception message was: javax.persistence.PersistenceException: [PersistenceUnit: XXX] Unable to build Hibernate SessionFactory; nested exception is: java.lang.RuntimeException: javax.persistence.PersistenceException: [PersistenceUnit: XXX] Unable to build Hibernate SessionFactory
at com.ibm.ejs.container.util.ExceptionUtil.EJBException(ExceptionUtil.java:503)
at com.ibm.ejs.container.ManagedBeanOBase.injectInstance(ManagedBeanOBase.java:154)
at com.ibm.ejs.container.StatelessBeanO.injectInstance(StatelessBeanO.java:295)
at com.ibm.ejs.container.StatelessBeanO.initialize(StatelessBeanO.java:169)
at com.ibm.ejs.container.BeanOFactory.create(BeanOFactory.java:105)
at com.ibm.ejs.container.EJSHome.createBeanO(EJSHome.java:976)
at com.ibm.ejs.container.EJSHome.createBeanO(EJSHome.java:1078)
at com.ibm.ejs.container.activator.UncachedActivationStrategy.atActivate(UncachedActivationStrategy.java:63)
at com.ibm.ejs.container.activator.Activator.preInvokeActivateBean(Activator.java:264)
at com.ibm.ejs.container.EJSContainer.preInvokeActivate(EJSContainer.java:3239)
at com.ibm.ejs.container.EJSContainer.EjbPreInvoke(EJSContainer.java:2576)
... 23 common frames omitted
Caused by: java.lang.RuntimeException: javax.persistence.PersistenceException: [PersistenceUnit: XXX] Unable to build Hibernate SessionFactory
at com.ibm.ws.jpa.management.JPAPUnitInfo.getEntityManagerFactory(JPAPUnitInfo.java:1028)
at com.ibm.ws.jpa.management.JPAPUnitInfo.getEntityManagerPool(JPAPUnitInfo.java:1253)
at com.ibm.ws.jpa.management.JPATxEntityManager.<init>(JPATxEntityManager.java:188)
at com.ibm.ws.jpa.container.v21.JPATxEntityManagerV21.<init>(JPATxEntityManagerV21.java:69)
at com.ibm.ws.jpa.runtime.JPA21Runtime.createJPATxEntityManager(JPA21Runtime.java:133)
at com.ibm.ws.jpa.management.AbstractJPAComponent.getEntityManager(AbstractJPAComponent.java:299)
at com.ibm.ws.util.JPAJndiLookupObjectFactory.getObjectInstance(JPAJndiLookupObjectFactory.java:177)
at com.ibm.wsspi.injectionengine.InjectionBinding.getInjectionObjectInstance(InjectionBinding.java:1556)
at com.ibm.wsspi.injectionengine.InjectionBinding.getInjectionObject(InjectionBinding.java:1433)
at com.ibm.wsspi.injectionengine.InjectionBinding.getInjectableObject(InjectionBinding.java:1373)
at com.ibm.wsspi.injectionengine.InjectionTarget.inject(InjectionTarget.java:108)
at com.ibm.ws.injectionengine.AbstractInjectionEngine.inject(AbstractInjectionEngine.java:852)
at com.ibm.ejs.container.ManagedBeanOBase.injectInstance(ManagedBeanOBase.java:148)
... 32 common frames omitted
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: XXX] Unable to build Hibernate SessionFactory
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:1016)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:942)
at org.hibernate.jpa.HibernatePersistenceProvider.createContainerEntityManagerFactory(HibernatePersistenceProvider.java:149)
at com.ibm.ws.jpa.management.JPAPUnitInfo.createEMFactory(JPAPUnitInfo.java:1161)
at com.ibm.ws.jpa.management.JPAPUnitInfo.initialize(JPAPUnitInfo.java:984)
at com.ibm.ws.jpa.management.JPAPxmlInfo.extractPersistenceUnits(JPAPxmlInfo.java:240)
at com.ibm.ws.jpa.management.JPAScopeInfo.processPersistenceUnit(JPAScopeInfo.java:115)
at com.ibm.ws.jpa.management.JPAApplInfo.addPersistenceUnits(JPAApplInfo.java:147)
at com.ibm.ws.jpa.management.SharedJPAComponentImpl.startingModule(SharedJPAComponentImpl.java:322)
at com.ibm.ws.jpa.management.JPAComponentImpl.startingDeployedModule(JPAComponentImpl.java:786)
at com.ibm.ws.jpa.management.JPAComponentImpl.startingDeployedApplication(JPAComponentImpl.java:636)
at com.ibm.ws.jpa.management.JPAComponentImpl.stateChanged(JPAComponentImpl.java:551)
at com.ibm.ws.runtime.component.ApplicationMgrImpl$ComparableDeployedObjectListener.stateChanged(ApplicationMgrImpl.java:2650)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.stateChanged(ApplicationMgrImpl.java:1177)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectEvent(DeployedApplicationImpl.java:1497)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.setState(DeployedApplicationImpl.java:310)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:1087)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:799)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplicationDynamically(ApplicationMgrImpl.java:1449)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:2309)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:436)
at com.ibm.ws.runtime.component.CompositionUnitImpl.start(CompositionUnitImpl.java:123)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:379)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.access$500(CompositionUnitMgrImpl.java:127)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$1.run(CompositionUnitMgrImpl.java:654)
at com.ibm.ws.security.auth.ContextManagerImpl.runAs(ContextManagerImpl.java:5556)
at com.ibm.ws.security.auth.ContextManagerImpl.runAsSystem(ContextManagerImpl.java:5682)
at com.ibm.ws.security.core.SecurityContext.runAsSystem(SecurityContext.java:255)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.startCompositionUnit(CompositionUnitMgrImpl.java:668)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.startCompositionUnit(CompositionUnitMgrImpl.java:612)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:1339)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:83)
at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:287)
at javax.management.modelmbean.RequiredModelMBean$4.run(RequiredModelMBean.java:1263)
at java.security.AccessController.doPrivileged(AccessController.java:664)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:91)
at javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1257)
at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:1096)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:831)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:813)
at com.ibm.ws390.management.connector.corba.CorbaConnectorImpl.invoke(CorbaConnectorImpl.java:1073)
at com.ibm.ws390.management.connector.corba._CorbaConnectorImplBase._invoke(_CorbaConnectorImplBase.java:416)
at com.ibm.ws390.orb.CommonBridge.invoke(CommonBridge.java:1898)
at com.ibm.ws390.orb.CommonBridge.getAndProcessWork(CommonBridge.java:725)
at com.ibm.ws390.orb.CommonBridge.runApplicationThread(CommonBridge.java:614)
at com.ibm.ws.util.ThreadPool$ZOSWorker.run(ThreadPool.java:2144)
Caused by: org.hibernate.MappingException: Could not determine type for: org.hibernate.dialect.DB2390Dialect, at table: XXX, for columns: [org.hibernate.mapping.Column(XML)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:486)
at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:453)
at org.hibernate.mapping.Property.isValid(Property.java:226)
at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:624)
at org.hibernate.mapping.RootClass.validate(RootClass.java:267)
at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:347)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:466)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:939)
... 51 common frames omitted