I am trying to create a "simple" OneToMany and ManyToOne relation.
And I get following Exception: 

> 
> Caused by: java.lang.ClassCastException:
>  org.hibernate.mapping.ManyToOne cannot be cast to
>  org.hibernate.mapping.Component at
>  org.hibernate.mapping.PersistentClass.getRecursiveProperty(PersistentClass.java:464)
>  ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.mapping.PersistentClass.getRecursiveProperty(PersistentClass.java:420)
>  ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:758)
>  ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:719)
>  ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:54)
>  ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1655)
>  ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1623)
>  ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:278)
>  ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:847)
>  ~[hibernate-entitymanager-5.0.9.Final.jar:5.0.9.Final] at
>  org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:874)
>  ~[hibernate-entitymanager-5.0.9.Final.jar:5.0.9.Final] at
>  org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)
>  ~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE] at
>  org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:338)
>  ~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE] at
>  org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:373)
>  ~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE] at
>  org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:362)
>  ~[spring-orm-4.3.2.RELEASE.jar:4.3.2.RELEASE] at
>  org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637)
>  ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE] at
>  org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
>  ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE] ... 39 common frames
>  omitted
> 
> 
> 

Is someone able to tell me what I am doing wrong?

Below you can find my two entities.

Thank you in advanced. 

```
  import javax.persistence.OneToMany;
@Entity
@Table(uniqueConstraints={@UniqueConstraint(columnNames={"questionGroupID","questionID"})})
public class QuestionGroupEntity implements Serializable{

    private static final long serialVersionUID = 1796640204447018439L;

    @Id
    @NotEmpty
    @Column(name="question_group_id")
    private String questionGroupID;

    @NotEmpty
    private String label;

    @NotEmpty
    private String questionID;

    @OneToMany(fetch=FetchType.EAGER,targetEntity=QuestionGroupMappingEntity.class,mappedBy="questionGroup")
    List<QuestionGroupMappingEntity> questionGroupMappings;

```

AND

```
import javax.persistence.ManyToOne;
    @Entity
    @Table(uniqueConstraints={@UniqueConstraint(columnNames={"questionGroupID","questionID","answerID"})})
    public class QuestionGroupMappingEntity implements Serializable {

        private static final long serialVersionUID = 8437546139229082305L;

        @Id
        @SequenceGenerator(name="groupMappingIDGenerator")
        @GeneratedValue(generator="groupMappingIDGenerator",strategy=GenerationType.AUTO)
        private String groupMappingID;

        @NotEmpty
        private String questionID;

        @NotEmpty
        private String questionGroupID;

        @NotEmpty
        private String answerID;

        @ManyToOne(fetch=FetchType.EAGER)
        @JoinColumn(name="question_group_id")
        private QuestionGroupEntity questionGroup;

```