Hibernate, первичный внешний ключ

package com.netcraft.hibernate.composite;
 
import javax.persistence.Embeddable;
import java.io.Serializable;
 
@Embeddable
public class AttrObjectTypeComposite implements Serializable {
    private long attr_id;
    private long object_type_id;
 
    public AttrObjectTypeComposite() {
    }
 
    public AttrObjectTypeComposite(long attr_id, long object_type_id) {
        this.attr_id = attr_id;
        this.object_type_id = object_type_id;
    }
 
    public long getAttr_id() {
        return attr_id;
    }
    public void setAttr_id(long attr_id) {
        this.attr_id = attr_id;
    }
    public long getObject_type_id() {
        return object_type_id;
    }
    public void setObject_type_id(long object_type_id) {
        this.object_type_id = object_type_id;
    }
}
 
 
 
 
 
package com.netcraft.model;
 
import javax.persistence.*;
import java.io.Serializable;
import com.netcraft.hibernate.composite.AttrObjectTypeComposite;
 
@Entity
@Table(name="attr_object_types")
@IdClass(AttrObjectTypeComposite.class)
public class AttrObjectType implements Serializable{
 
    @Id
    @AttributeOverrides({
            @AttributeOverride(name="attrId", @Column(name="attr_id"))
            @AttributeOverride(name="objectTypeId", @Column(name="object_type_id"))
    })
 
    private long object_type_id;
    private long attr_id;
 
 
    public AttrObjectType() {
    }
 
    public AttrObjectType(AttrObjectTypeComposite attrObjectTypeComposite) {
        this.attr_id = attrObjectTypeComposite.getAttr_id();
        this.object_type_id = attrObjectTypeComposite.getObject_type_id();
    }
 
    public long getAttr_id() {
        return attr_id;
    }
    public void setAttr_id(long attr_id) {
        this.attr_id = attr_id;
    }
 
    public long getObject_type_id() {
        return object_type_id;
    }
    public void setObject_type_id(long object_type_id) {
        this.object_type_id = object_type_id;
    }
}

...(много внешних эксепшнов) .... 
 nested exception is org.hibernate.MappingException: Could not determine type for: java.util.Set, at table: attributes, for columns: [org.hibernate.mapping.Column(objectTypes)]

package com.netcraft.model;
 
import org.hibernate.annotations.GenericGenerator;
import javax.persistence.*;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
 
@Entity
@Table(name = "attributes")
public class Attribute implements Serializable{
    @Id
    @Column
    @GeneratedValue(strategy=GenerationType.AUTO)
    private long attr_id;
 
    @Column
    private long attr_type_id;
    @Column
    private String name;
 
 
    private Set<ObjectType> objectTypes = new HashSet<ObjectType>(0);
 
    public Attribute() {
    }
 
    public Attribute(long attr_type_id, String name, Set<ObjectType> objectTypes) {
 
        this.attr_type_id = attr_type_id;
        this.name = name;
        this.objectTypes = objectTypes;
    }
 
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
 
    public long getAttr_type_id() {
        return attr_type_id;
    }
    public void setAttr_type_id(long attr_type_id) {
        this.attr_type_id = attr_type_id;
    }
 
    public long getAttr_id() {
        return attr_id;
    }
    public void setAttr_id(long attr_id) {
        this.attr_id = attr_id;
    }
 
    @ManyToMany(mappedBy = "attributes")
    public Set<ObjectType> getObjectTypes() {
        return this.objectTypes;
    }
 
    public void setObjectTypes(Set<ObjectType> objectTypes) {
        this.objectTypes = objectTypes;
    }
}

package com.netcraft.model;
 
import javax.persistence.*;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
 
@Entity
@Table(name = "object_types")
public class ObjectType implements Serializable{
 
    @Id
    @Column
    @GeneratedValue(strategy= GenerationType.AUTO)
    private long object_type_id;
 
    @Column
    private String name;
    @Column
    private long parent_id;
 
    private Set<Attribute> attributes = new HashSet<Attribute>(0);
 
    public ObjectType() {
    }
 
    public ObjectType(Set<Attribute> attributes, String name, long parent_id) {
 
        this.attributes = attributes;
        this.name = name;
        this.parent_id = parent_id;
    }
 
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
 
    public long getObject_type_id() {
        return object_type_id;
    }
    public void setObject_type_id(long object_type_id) {
        this.object_type_id = object_type_id;
    }
 
    public long getParent_id() {
        return parent_id;
    }
    public void setParent_id(long parent_id) {
        this.parent_id = parent_id;
    }
 
    @ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinTable(name = "attr_object_types", joinColumns = {
            @JoinColumn(name = "object_type_id", referencedColumnName="object_type_id") },
            inverseJoinColumns = { @JoinColumn(name = "attr_id",
                    referencedColumnName="attr_id") })
    public Set<Attribute> getAttributes() {
        return this.attributes;
    }
 
    public void setAttributes(Set<Attribute> attributes) {
        this.attributes = attributes;
    }
}

package com.netcraft.model;
 
import com.netcraft.hibernate.composite.ParamPK;
 
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Table;
import java.util.Date;
 
@Entity
@Table(name="params")
public class Param {
    @EmbeddedId
    ParamPK paramPK;
 
    @Column
    private long attr_id;
    @Column
    private long object_id;
    @Column
    private String value;
    @Column
    private Date date_value;
 
    public Date getDate_value() {
        return date_value;
    }
    public void setDate_value(Date date_value) {
        this.date_value = date_value;
    }
 
    public long getAttr_id() {
        return attr_id;
    }
    public void setAttr_id(long attr_id) {
        this.attr_id = attr_id;
    }
 
    public long getObject_id() {
        return object_id;
    }
    public void setObject_id(long object_id) {
        this.object_id = object_id;
    }
 
    public String getValue() {
        return value;
    }
    public void setValue(String value) {
        this.value = value;
    }
}