Hello out there,
I created for my small project two Entity-Beans which have a 1toN-relationship. In detail I have one ZugangsdatenBean (this is german but it doesn't matter what this means) and several TanBeans. From my point of view, there should be no problems. I show you the two beans. First the ZugangsdatenBean which is on the '1'-Edge:

@Entity
@Table(name="ZUGANGSDATEN")
public class ZugangsdatenBean implements Serializable
{
 private static final long serialVersionUID = 1L;
 private String passwort;
 private String login_Name;
 private String pin;
 private Collection <TanBean> tans = new ArrayList<TanBean>();

 public ZugangsdatenBean() {}

 public ZugangsdatenBean( String passwort, String login_name, String pin )
 {
 this.passwort = passwort;
 this.login_Name = login_name;
 this.pin = pin;
 }

 @Column (name="PASSWORT")
 public String getpassword()
 {
 return this.passwort;
 }

 public void setpassword(String mypassword)
 {
 this.passwort = mypassword;
 }

 @Column (name="LOGIN")
 public String getlogin_name()
 {
 return this.login_Name;
 }

 public void setlogin_name(String mylogin)
 {
 this.login_Name = mylogin;
 }

 @Id
 @Column (name="PIN")
 public String getpin()
 {
 return this.pin;
 }

 public void setpin(String mypin)
 {
 this.pin = mypin;
 }


 @OneToMany (mappedBy="zugangsdatenbean",cascade=CascadeType.ALL, fetch=FetchType.EAGER)
 public Collection <TanBean> getAllTans()
 {
 return this.tans;
 }

 public void setTans(Collection <TanBean> mytan)
 {
 this.tans = mytan;
 }


}

And now the TanBean:

@Entity
@Table(name="TAN")
public class TanBean implements Serializable
{
 private static final long serialVersionUID = 1L;
 private String nummer;
 private ZugangsdatenBean zugang = null;

 public TanBean (String mynummer)
 {
 this.nummer = mynummer;
 }

 @Id
 @Column (name="TNUMMER")
 @GeneratedValue ()
 public String getNummer()
 {
 return this.nummer;
 }

 public void setNummer(String mynummer)
 {
 this.nummer = mynummer;
 }

 @ManyToOne
 @JoinColumn(name="ZUGANGSDATEN")
 public ZugangsdatenBean getZugangsDaten()
 {
 return this.zugang;
 }

 public void setZugangsDaten(ZugangsdatenBean myzugang)
 {
 this.zugang = myzugang;
 }
}

The Eclipse-Console give me this errors:

23:52:14,124 WARN [ServiceController] Problem starting service persistence.units:ear=TestBank.ear,jar=TestBankEJB.jar,unitName=chaos
org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: org.chaos.tans.TanBean.zugangsdatenbean in org.chaos.zugangsdaten.ZugangsdatenBean.allTans

What is my misstake?

Than you

Gruss Christian