Problem on saving/deleting entities

[bogdannb]

I have the following jpa class :

/**
 *
 */
package ro.spad.web.registrucasa.client.model;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;

import com.google.gwt.user.client.rpc.IsSerializable;

/**
 * @author [e-mail]
 *
 */

@Entity
@Table(name = "registrudecasa")
public class RegistruDeCasa implements Serializable, IsSerializable {

        private int myid;
       
        private Date data;
       
        private List<LinieRegistru> liniiRegistru;
       
        private PunctDeLucru punctDeLucru;
       
        private User userBasic;
       
        private User userExpert;
       
        @Id @GeneratedValue(strategy=GenerationType.AUTO)
        public int getMyid() {
                return myid;
        }
        public void setMyid(int myid) {
                this.myid = myid;
        }

        @Column (length = 100, nullable = false)
        public void setData(Date data) {
                this.data = data;
        }
        public Date getData() {
                return data;
        }
               
        @OneToMany (fetch = FetchType.LAZY)
        @JoinTable(name = "registrudecasa_linieregistru", joinColumns = @JoinColumn(name = "registrudecasa_myid"), inverseJoinColumns = @JoinColumn(name = "linieregistru_myid"))
        public List<LinieRegistru> getLiniiRegistru() {
                return liniiRegistru;
        }
        public void setLiniiRegistru(List<LinieRegistru> liniiRegistru) {
                this.liniiRegistru = liniiRegistru;
        }
       
        @OneToOne (cascade = CascadeType.ALL)
        @JoinColumn(name="PUNCTDELUCRU_MYID",  nullable = true, insertable = true, updatable = true)
        public PunctDeLucru getPunctDeLucru() {
                return punctDeLucru;
        }
        public void setPunctDeLucru(PunctDeLucru punctDeLucru) {
                this.punctDeLucru = punctDeLucru;
        }
       
        @OneToOne (cascade = CascadeType.ALL)
        @JoinColumn(name="USER_BASIC_MYID", nullable = false, insertable = true, updatable = true)
        public User getUserBasic() {
                return userBasic;
        }
       
        public void setUserBasic(User userBasic) {
                this.userBasic = userBasic;
        }
       
        @OneToOne (cascade = CascadeType.ALL)
        @JoinColumn(name="USER_EXPERT_MYID", nullable = true, insertable = true, updatable = true)
        public User getUserExpert() {
                return userExpert;
        }
        public void setUserExpert(User userExpert) {
                this.userExpert = userExpert;
        }
}


I'm having a problem when saving or deleting an entity "RegistruDeCasa". The problem is that this entity has a reference to an entity called userExpert(class : User) and when I'm trying to save or delete a "RegistruDeCasa" my application tryes also to update or delete the expertUser. Is this a matter of JPA and annotations? I'm not very sure .... maybe it's something regarding Hibernate (my application also uses Hibernate) but I don't know for sure......Can somebody help me? This problem also persist whenever I  try to save an entity that has one to one relations to another entity( for example in this class : punctDeLucru,userBasic,userExpert).
        Thanks in advance,
               Bogdannb