Mapeamento OneToMany

Hibernate ORM
1

I’m trying to do a one-way mapping but it’s null

Class TabDisc

@Id // disciplina 
@GeneratedValue(strategy = GenerationType.AUTO, generator = "academico.seq_tabdisc")
@SequenceGenerator(allocationSize = 1, name = "academico.seq_tabdisc", sequenceName = "academico.seq_tabdisc")
@Column(name = "coddisc")
private Integer coddisc; // codigo de descrição
@Column(name = "desdisc")
private String desdisc; // descrição
@Column(name = "hordisc")
private Integer hordisc; // carga horaria
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER )
@JoinColumn(name = "codcurs", referencedColumnName = "codcurs")
private List<TabCurs> codcurs = new ArrayList<>();
@Column(name = "atiesta")
private Integer atiesta;
@Column(name = "horesta")
private Integer horesta;

Class TabCurs

@Id
@GeneratedValue(strategy = GenerationType.AUTO, generator = "academico.seq_tabcurs")
@SequenceGenerator(allocationSize = 1, name = "academico.seq_tabcurs", sequenceName = "academico.seq_tabcurs")
@Column(name = "codcurs")
private Integer codcurs;
@Column(name = "aplcurs")
private String aplcurs; // apelido 
@Column(name = "procurs")
private Integer procurs;
@Column(name = "aticurs")
private Integer aticurs;
@Column(name = "quamese")
private Integer quamese;

The mistake

java.lang.NullPointerException
at org.hibernate.cfg.annotations.CollectionBinder.bindCollectionSecondPass(CollectionBinder.java:1456)
at org.hibernate.cfg.annotations.CollectionBinder.bindOneToManySecondPass(CollectionBinder.java:864)
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:779)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:728)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:70)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1695)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1424)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1844)
at br.inf.topsoft.data.controller.HibernateUtil.conecta(HibernateUtil.java:471)
at br.inf.topsoft.toploginfx.controller.LoginController$1.call(LoginController.java:309)
at br.inf.topsoft.toploginfx.controller.LoginController$1.call(LoginController.java:295)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1423)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at javafx.concurrent.Service.lambda$null$491(Service.java:725)
at java.security.AccessController.doPrivileged(Native Method)
at javafx.concurrent.Service.lambda$executeTask$492(Service.java:724)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at br.inf.topsoft.toploginfx.controller.LoginController$2.failed(LoginController.java:408)
at javafx.concurrent.Service.lambda$new$489(Service.java:539)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
at javafx.beans.property.ObjectPropertyBase.access$000(ObjectPropertyBase.java:51)
at javafx.beans.property.ObjectPropertyBase$Listener.invalidated(ObjectPropertyBase.java:233)
at com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:137)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
at javafx.concurrent.Task.setState(Task.java:696)
at javafx.concurrent.Task$TaskCallable.lambda$call$500(Task.java:1453)
at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Thread.java:748)
2

Try do debug it and see why you get that null. It’s not clear from the mappings what may be wrong.

3

Ok, thank you, good idea

4 
Thank you

It appeared that the problem is in the session, however this is so difficult when you do this mapping, I tried to use mappedBy, but the list was coming empty

 public static Session getSession() {

    Session session = sessionFactory.openSession();


    session.beginTransaction();
    return session;

}

    java.lang.NullPointerException
at br.inf.topsoft.data.controller.HibernateUtil.getSession(HibernateUtil.java:548)
at br.inf.topsoft.data.dao.TabUsuaDao.getUnico(TabUsuaDao.java:210)
at br.inf.topsoft.toploginfx.controller.LoginController$1.call(LoginController.java:312)
at br.inf.topsoft.toploginfx.controller.LoginController$1.call(LoginController.java:295)
5

The HibernateUtil is not a Hibernate class, so it is a bug in your application.

You are better off a container like Spring or JavaEE to manage the Hibernate Session.