I'm a beginner and I cannot imagine what's wrong wit my code.

I have two tables with many to many relationship between them:

first table Owner:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="entity.Owner" table="OWNER">
<meta attribute="class-description">This class contains owner details.</meta>
<id column="OWNER_ID" name="id" type="long">
<generator class="native"/>
</id>
<property column="NUME" length="100" name="nume" not-null="false" type="string"/>
<property column="INITIALA" length="100" name="initiala" not-null="false" type="string"/>
<property column="PRENUME" length="100" name="prenume" not-null="false" type="string"/>
<property column="NUMECONT" length="100" name="numecont" not-null="false" type="string"/>
<set cascade="all" name="ownerTelefon" table="OWNER_TELEFON" >
<key column="OWNER_ID_R"/>
<many-to-many column="TELEFON_ID_R" class="entity.Telefon"/>
</set>

</hibernate-mapping>


second table Telefon:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="entity.Telefon" table="TELEFON">
<meta attribute="class-description">This class contains owner's phone number
details.</meta>
<id column="TELEFON_ID" name="id" type="long">
<generator class="native"/>
</id>
<property column="TELTEXTBOX" length="20" name="teltextbox" type="string"/>
<property column="TIPTEXTBOX" length="20" name="tiptextbox" type="string"/>
<property column="CORESP_VDF" length="20" name="coresp_vdf" type="string"/>
<property column="SCURT_VDF" length="20" name="scurt_vdf" type="string"/>
<property column="GRUP" name="grup" type="integer"/>
<property column="IS_CFR" name="is_cfr" type="boolean"/>
<set name="owners" table="OWNER_TELEFON">
<key column="TELEFON_ID_R"/>
<many-to-many column="OWNER_ID_R" class="entity.Owner"/>
</set>



the class for Owner is :

public class Owner implements Serializable {

public Owner(){
}

public Owner(String nume){
this.nume=nume;
}

public Owner(String nume, Collection<Telefon> ownerTelefon){
this.nume=nume;
this.ownerTelefon=ownerTelefon;
}

private Long id;
private String nume;
private String prenume;
private String initiala;
private String numecont;
private Collection<Telefon> ownerTelefon;


public Long getId() {
return id;
}


public void setId(Long id) {
this.id = id;
}


public String getNume() {
return nume;

}

public void setNume(String nume) {
this.nume = nume;
}

public String getPrenume() {

return prenume;
}

public void setPrenume(String prenume) {
this.prenume = prenume;
}


public String getInitiala() {

return initiala;


}

public void setInitiala(String initiala) {
this.initiala = initiala;
}

public String getNumecont() {
if (isValidNumecont()) {
return numecont;
}
return "Nu a fost introdus nume cont";
}


public void setNumecont(String numecont) {
this.numecont = numecont;
}

public Collection<Telefon> getOwnerTelefon(){
return ownerTelefon;
}

/**
* @param telefon the telefon to set
*/
public void setOwnerTelefon(Collection<Telefon> ownerTelefon) {
this.ownerTelefon = ownerTelefon;
}







the class for Telefon is :


public class Telefon implements Serializable {

public Telefon() {

}

public Telefon(String tiptextbox, String teltextbox) {
this.tiptextbox=tiptextbox;
this.teltextbox=teltextbox;
}



private Long id;
private String teltextbox;
private String tiptextbox;
private String coresp_vdf;
private String scurt_vdf;
private Boolean is_cfr;
private Collection<Owner> owners;




public Long getId() {
return id;
}


public void setId(Long id) {
this.id = id;
}


public String getTeltextbox() {
return teltextbox;
}


public void setTeltextbox(String teltextbox) {
this.teltextbox = teltextbox;
}


public String getTiptextbox() {
return tiptextbox;
}


public void setTiptextbox(String tiptextbox) {
this.tiptextbox = tiptextbox;
}


public String getCoresp_vdf() {
return coresp_vdf;
}

public void setCoresp_vdf(String coresp_vdf) {
this.coresp_vdf = coresp_vdf;
}


public String getScurt_vdf() {
return scurt_vdf;
}

public void setScurt_vdf(String scurt_vdf) {
this.scurt_vdf = scurt_vdf;
}

public Boolean getIs_cfr() {
return is_cfr;
}

public void setIs_cfr(Boolean is_cfr) {
this.is_cfr = is_cfr;
}




public Collection<Owner> getOwners() {
return owners;
}

public void setOwners(Collection<Owner> owners) {
this.owners = owners;
}


}


How could I get the ownerTelefon set for a specified Owner.id ???