package model;

import javax.persistence.*;

import com.avaje.ebean.validation.Length;

@Entity
@Table (name = "breed_feature") 
public class BreedFeature {

    @Id
    @Column(name="id")
    private Long id;

    @Column(name="name")
    @Length(max=6)
    private String name;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public int hashCode() {
        return (int) id.hashCode();
    }

    public boolean equals(Object obj) {
        if (obj == this) return true;
        if (obj == null) return false;
        if (!(obj instanceof BreedFeature)) return false;
        BreedFeature pk = (BreedFeature) obj;
        return pk.id == id && pk.name == name;
    }
}

package model;

import java.util.List;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Version;

import com.avaje.ebean.validation.Length;

@Entity
@Table (name = "color")
public class Color {

    @Id
    @Column(name="id")
    private Long id;

    @Column(name="name")
    @Length(max=10)
    String value;

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

    public String getValue() {
        return value;
    }

    public void setName(String name) {
        this.value = name;
    }

    public void main (String []arg) {
    }
}

import javax.persistence.*;

/**
 * @author Artyom
 *
 */
@Entity
@Table(name="body_color")  
public class BodyColor {

    @EmbeddedId
    private BodyColorPK breedFeatureId;

    @MapsId(value="breedFeatureId")
    @ManyToOne
    @JoinColumn(name = "breed_feature_id", referencedColumnName = "id")
    private BreedFeature breedFeature;

    @MapsId(value="colorId")
    @ManyToOne
    @JoinColumn(name = "color_id", referencedColumnName = "id")
    private Color color;


    @Embeddable
    public class BodyColorPK implements Serializable {

        private static final long serialVersionUID = 972450558222049731L;

        @Basic
        private long breedFeatureId;

        @Basic
        private long colorId;

        public BodyColorPK() {      
        }

        public BodyColorPK(Long breed_feature_id, Long color_id) {
            this.breedFeatureId = breed_feature_id;
            this.colorId = color_id;
        }

        public Long getBreedFeatureId () {
            return this.breedFeatureId;
        }

        public void setBreedFeatureId (Long newBreedFeatureId) {
            this.breedFeatureId = newBreedFeatureId;
        }
        @Override
        public int hashCode() {
            return (int) (breedFeatureId + colorId);
        }
        @Override
        public boolean equals(Object obj) {
            if (obj == this) return true;
            if (obj == null) return false;
            if (!(obj instanceof BodyColorPK)) return false;
            BodyColorPK pk = (BodyColorPK) obj;
            return pk.breedFeatureId == breedFeatureId && pk.colorId == colorId;
        }
    }

}

BreedFeature e = new BreedFeature();
e.setName("test");
// will insert
Ebean.save(e);