Problema con JPA

[Selva123]

Gracias por tu respuesta, este es el código de mi clase Auto:

Código:

package probandorelacion;

import java.io.Serializable;
import javax.persistence.*;
import javax.xml.bind.annotation.XmlRootElement;

/**
 *
 * @author Ricardo
 */
@Entity
@Table(name = "auto")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Auto.findAll", query = "SELECT a FROM Auto a"),
    @NamedQuery(name = "Auto.findById", query = "SELECT a FROM Auto a WHERE a.id = :id"),
    @NamedQuery(name = "Auto.findByMarca", query = "SELECT a FROM Auto a WHERE a.marca = :marca"),
    @NamedQuery(name = "Auto.findByModelo", query = "SELECT a FROM Auto a WHERE a.modelo = :modelo"),
    @NamedQuery(name = "Auto.findByPatente", query = "SELECT a FROM Auto a WHERE a.patente = :patente")})
public class Auto implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id")
    private Integer id;
    @Basic(optional = false)
    @Column(name = "marca")
    private String marca;
    @Basic(optional = false)
    @Column(name = "modelo")
    private String modelo;
    @Basic(optional = false)
    @Column(name = "patente")
    private String patente;
    @JoinColumn(name = "persona_fk", referencedColumnName = "id")
    @ManyToOne
    private Persona personaFk;

    public Auto() {
    }

    public Auto(Integer id) {
        this.id = id;
    }

    public Auto(String marca, String modelo, String patente) {
        this.marca = marca;
        this.modelo = modelo;
        this.patente = patente;
    }

    public Auto(Integer id, String marca, String modelo, String patente) {
        this.marca = marca;
        this.modelo = modelo;
        this.patente = patente;
    }

    public Integer getId() {
        return id;
    }

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

    public String getMarca() {
        return marca;
    }

    public void setMarca(String marca) {
        this.marca = marca;
    }

    public String getModelo() {
        return modelo;
    }

    public void setModelo(String modelo) {
        this.modelo = modelo;
    }

    public String getPatente() {
        return patente;
    }

    public void setPatente(String patente) {
        this.patente = patente;
    }

    public Persona getPersonaFk() {
        return personaFk;
    }

    public void setPersonaFk(Persona personaFk) {
        this.personaFk = personaFk;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Auto)) {
            return false;
        }
        Auto other = (Auto) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "probandorelacion.Auto[ id=" + id + " ]";
    }
    
}

Efectivamente, se encuentra la anotación @ManyToOne

EDITO: Por las dudas también dejo el código de la clase Persona

Código:

package probandorelacion;

import java.io.Serializable;
import java.util.Collection;
import javax.persistence.*;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;
import java.util.*;

/**
 *
 * @author Ricardo
 */
@Entity
@Table(name = "persona")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Persona.findAll", query = "SELECT p FROM Persona p"),
    @NamedQuery(name = "Persona.findById", query = "SELECT p FROM Persona p WHERE p.id = :id"),
    @NamedQuery(name = "Persona.findByNombre", query = "SELECT p FROM Persona p WHERE p.nombre = :nombre"),
    @NamedQuery(name = "Persona.findByApellido", query = "SELECT p FROM Persona p WHERE p.apellido = :apellido"),
    @NamedQuery(name = "Persona.findByDni", query = "SELECT p FROM Persona p WHERE p.dni = :dni")})
public class Persona implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id")
    private Integer id;
    @Basic(optional = false)
    @Column(name = "nombre")
    private String nombre;
    @Basic(optional = false)
    @Column(name = "apellido")
    private String apellido;
    @Basic(optional = false)
    @Column(name = "dni")
    private String dni;
    @OneToMany(mappedBy = "personaFk", cascade=CascadeType.ALL)
    private Collection<Auto> autoCollection;

    public Persona() {
    }

    public Persona(Integer id) {
        this.id = id;
    }

    public Persona(Integer id, String nombre, String apellido, String dni) {
        this.nombre = nombre;
        this.apellido = apellido;
        this.dni = dni;
    }

    public Integer getId() {
        return id;
    }

    public Persona(String nombre, String apellido, String dni) {
        this.id = 2;
        this.nombre = nombre;
        this.apellido = apellido;
        this.dni = dni;
    }

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

    public String getNombre() {
        return nombre;
    }

    public void setNombre(String nombre) {
        this.nombre = nombre;
    }

    public String getApellido() {
        return apellido;
    }

    public void setApellido(String apellido) {
        this.apellido = apellido;
    }

    public String getDni() {
        return dni;
    }

    public void setDni(String dni) {
        this.dni = dni;
    }

    @XmlTransient
    public Collection<Auto> getAutoCollection() {
        return autoCollection;
    }

    public void setAutoCollection(Collection<Auto> autoCollection) {
        this.autoCollection = autoCollection;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Persona)) {
            return false;
        }
        Persona other = (Persona) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "probandorelacion.Persona[ id=" + id + " ]";
    }
    
    public void comprarAuto(String marca,String modelo, String patente){
        Auto unAuto = new Auto(marca,modelo,patente);
        autoCollection = new LinkedList<Auto>();
        autoCollection.add(unAuto);
        
    }
}