Data.java

package org.tests.inherit;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
import java.util.ArrayList;
import java.util.List;

@Entity
@Table(name = "rawinherit_data")
public class Data {

  @Id
  private Long id;

  private Integer val;

  @ManyToMany(mappedBy = "data")
  public List<Parent> parents = new ArrayList<>();

  public Data(int number) {
    this.val = number;
  }

  public Long getId() {
    return id;
  }

  public Integer getVal() {
    return val;
  }

}