why i get javax.ejb.EJBTransactionRolledbackException? - setRollbackOnly

In my web applicaton I use OpenJPA on Apache Tomcat (TomEE)/7.0.37 server. my entity User.class: ``` @Entity @Table(name = "USER") public class User implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue @Basic(optional = false) @Column(name = "id_user") private Integer idUser; @Size(max = 8) @Column(name = "login") private String login; @Size(max = 128) @Column(name = "password") private String password; @OneToOne(cascade = CascadeType.ALL, mappedBy = "user") private Lecturer lecturer; @OneToOne(cascade = CascadeType.ALL, mappedBy = "user") private Student student; @OneToMany(cascade = CascadeType.ALL, mappedBy = "user") private List<UserHasRoles> userHasRolesList; //constructors, getters, setters } ``` when i create new user: ``` public void addUser(String log, String pass) { User user = new User(); //utworzenie użytkownika i dodanie do bazy user.setLogin(log); user.setPassword(pass); em.persist(user); } ``` i get exception: ``` javax.el.ELException: javax.ejb.EJBTransactionRolledbackException: Transaction was rolled back, presumably because setRollbackOnly was called during a synchronization Caused by: org.apache.geronimo.transaction.manager.SetRollbackOnlyException - setRollbackOnly() called. See stacktrace for origin at org.apache.geronimo.transaction.manager.TransactionImpl.setRollbackOnly(TransactionImpl.java:126) ``` I try to change generation id strategy, but it dosen't help. What is wrong? stack trace from my application: ``` org.apache.myfaces.view.facelets.el.ContextAwareELException: javax.el.ELException: javax.ejb.EJBTransactionRolledbackException: Transaction was rolled back, presumably because setRollbackOnly was called during a synchronization at org.apache.myfaces.view.facelets.el.ContextAwareTagMethodExpression.invoke(ContextAwareTagMethodExpression.java:108) at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:68) at javax.faces.component.UICommand.broadcast(UICommand.java:120) at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:1028) at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:286) at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1375) at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:752) at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:38) at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:170) at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at filters.NoCacheFilter.doFilter(NoCacheFilter.java:42) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:724) Caused by: javax.el.ELException: javax.ejb.EJBTransactionRolledbackException: Transaction was rolled back, presumably because setRollbackOnly was called during a synchronization at org.apache.el.parser.AstValue.invoke(AstValue.java:291) at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274) at org.apache.myfaces.view.facelets.el.ContextAwareTagMethodExpression.invoke(ContextAwareTagMethodExpression.java:96) ... 30 more Caused by: javax.ejb.EJBTransactionRolledbackException: Transaction was rolled back, presumably because setRollbackOnly was called during a synchronization at org.apache.openejb.core.ivm.BaseEjbProxyHandler.convertException(BaseEjbProxyHandler.java:345) at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:283) at model.logic.UserService$LocalBeanProxy.addUser(model/logic/UserService.java) at model.backingbeans.RegisterBacking.register(RegisterBacking.java:91) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.el.parser.AstValue.invoke(AstValue.java:278) ... 32 more Caused by: javax.transaction.RollbackException: Unable to commit: transaction marked for rollback at org.apache.geronimo.transaction.manager.TransactionImpl.commit(TransactionImpl.java:272) at org.apache.geronimo.transaction.manager.TransactionManagerImpl.commit(TransactionManagerImpl.java:252) at org.apache.openejb.core.transaction.JtaTransactionPolicy.completeTransaction(JtaTransactionPolicy.java:328) at org.apache.openejb.core.transaction.TxRequired.commit(TxRequired.java:75) at org.apache.openejb.core.transaction.EjbTransactionUtil.afterInvoke(EjbTransactionUtil.java:76) at org.apache.openejb.core.stateless.StatelessContainer._invoke(StatelessContainer.java:259) at org.apache.openejb.core.stateless.StatelessContainer.invoke(StatelessContainer.java:191) at org.apache.openejb.core.ivm.EjbObjectProxyHandler.synchronizedBusinessMethod(EjbObjectProxyHandler.java:246) at org.apache.openejb.core.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java:241) at org.apache.openejb.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:83) at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:279) ... 39 more Caused by: org.apache.geronimo.transaction.manager.SetRollbackOnlyException: setRollbackOnly() called. See stacktrace for origin at org.apache.geronimo.transaction.manager.TransactionImpl.setRollbackOnly(TransactionImpl.java:126) at org.apache.geronimo.transaction.manager.TransactionManagerImpl.setRollbackOnly(TransactionManagerImpl.java:243) at org.apache.openejb.core.TransactionSynchronizationRegistryWrapper.setRollbackOnly(TransactionSynchronizationRegistryWrapper.java:71) at org.apache.openjpa.ee.RegistryManagedRuntime$TransactionManagerRegistryFacade.setRollbackOnly(RegistryManagedRuntime.java:128) at org.apache.openjpa.ee.RegistryManagedRuntime.setRollbackOnly(RegistryManagedRuntime.java:74) at org.apache.openjpa.ee.AutomaticManagedRuntime.setRollbackOnly(AutomaticManagedRuntime.java:274) at org.apache.openjpa.kernel.BrokerImpl.setRollbackOnlyInternal(BrokerImpl.java:1660) at org.apache.openjpa.kernel.BrokerImpl.setRollbackOnly(BrokerImpl.java:1640) at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1847) at org.apache.openjpa.kernel.StateManagerImpl.assignObjectId(StateManagerImpl.java:616) at org.apache.openjpa.kernel.StateManagerImpl.assignField(StateManagerImpl.java:703) at org.apache.openjpa.kernel.StateManagerImpl.beforeAccessField(StateManagerImpl.java:1615) at org.apache.openjpa.kernel.StateManagerImpl.accessingField(StateManagerImpl.java:1598) at model.entity.User.pcGetidUser(User.java) at model.entity.User.toString(User.java:137) at java.text.MessageFormat.subformat(MessageFormat.java:1271) at java.text.MessageFormat.format(MessageFormat.java:860) at java.text.Format.format(Format.java:157) at java.text.MessageFormat.format(MessageFormat.java:836) at org.apache.openjpa.lib.util.Localizer$Message.getMessage(Localizer.java:282) at org.apache.openjpa.util.OpenJPAException.<init>(OpenJPAException.java:64) at org.apache.openjpa.util.UserException.<init>(UserException.java:47) at org.apache.openjpa.util.InvalidStateException.<init>(InvalidStateException.java:34) at org.apache.openjpa.kernel.SingleFieldManager.preFlush(SingleFieldManager.java:567) at org.apache.openjpa.kernel.SingleFieldManager.preFlush(SingleFieldManager.java:505) at org.apache.openjpa.kernel.StateManagerImpl.preFlush(StateManagerImpl.java:2982) at org.apache.openjpa.kernel.PNewState.beforeFlush(PNewState.java:40) at org.apache.openjpa.kernel.StateManagerImpl.beforeFlush(StateManagerImpl.java:1054) at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:2112) at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:2072) at org.apache.openjpa.kernel.BrokerImpl.beforeCompletion(BrokerImpl.java:1990) at org.apache.geronimo.transaction.manager.TransactionImpl.beforeCompletion(TransactionImpl.java:527) at org.apache.geronimo.transaction.manager.TransactionImpl.beforeCompletion(TransactionImpl.java:512) at org.apache.geronimo.transaction.manager.TransactionImpl.beforePrepare(TransactionImpl.java:413) at org.apache.geronimo.transaction.manager.TransactionImpl.commit(TransactionImpl.java:262) ... 49 more ```