import java.util.Set;

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.OneToMany;
import javax.persistence.OrderBy;
import javax.persistence.Table;

@Entity
@Table(name = "MICRO_MAP")
public class MicroMap { //main table
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private Long id;

    @Column(name = "NAME", length = 32, nullable = false)
    private String name;

    @OneToMany(mappedBy="mapId",cascade=CascadeType.ALL, fetch=FetchType.EAGER)
    @OrderBy("camera.name") //OrderBy the field of "name" in Camera table
    private Set<RelatedCamera> relatedCameraSet;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Set<RelatedCamera> getRelatedCameraSet() {
        return relatedCameraSet;
    }

    public void setRelatedCameraSet(Set<RelatedCamera> relatedCameraSet) {
        this.relatedCameraSet = relatedCameraSet;
    }   
}

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.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name = "RELATED_CAMERA")
public class RelatedCamera {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private Long id;

    @Column(name = "MAP_ID")
    private String mapId;

    @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
    @JoinColumn(name = "CAMERA_ID", referencedColumnName="id",nullable = true)
    private Camera camera;

    public Long getId() {
        return id;
    }

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

    public String getMapId() {
        return mapId;
    }

    public void setMapId(String mapId) {
        this.mapId = mapId;
    }

    public Camera getCamera() {
        return camera;
    }

    public void setCamera(Camera camera) {
        this.camera = camera;
    }   
}

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "CAMERA")
public class Camera {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private Long id;

    @Column(name = "NAME")
    private String name;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

@OneToMany(mappedBy="mapId",cascade=CascadeType.ALL, fetch=FetchType.EAGER)
@SortComparator(CameraNameComparator.class)
private SortedSet<RelatedCamera> relatedCameraSet  = new TreeSet<>();

public static class CameraNameComparator implements Comparator<RelatedCamera> {
    @Override
    public int compare(RelatedCamera o1, RelatedCamera o2) {
        return o1.getCamera().getName().compareTo( o2.getCamera().getName() );
    }
}