Redefine a property in a subclass within a SINGLE_TABLE inheritance hierarchy in Hibernate

Issue

• Migrating from JBoss EAP 6 / Hibernate 4

• A SINGLE_TABLE hierarchy is defined as below and a persistent String property (title/e_title) is redefined in a subclass as a JoinColumn (foreign key)

  @Entity
  @Inheritance(strategy = InheritanceType.SINGLE_TABLE)
  @DiscriminatorColumn(name="department")
  public abstract class Employee {
      ...
      @Column(name = "e_title", updatable = false, insertable = false)
      public String getTitle() {
              return title;
      }
      ...
  }
  
  @Entity
  @DiscriminatorValue(value="writer")
  public class Writer extends Employee {
      ...
      @Column(name = "e_title") // redefine the nature of this property to serve as a foreign key
      public String getTitle() {
              return title;
      }
  ...
  }
  
  @Entity
  @DiscriminatorValue(value="editor")
  public class Editor extends Employee {
  ...
  @Column(name = "e_title") // use as an ordinary property (must also disable referential integrity in the database)
  public String getTitle() {
      return title;
  }
      ...
  }
  

• The redefinition of the property as a foreign key appeared to work in EAP 6 / Hibernate 4, but is no longer working in EAP 7 / Hibernate 5: SQL inserts/updates of entity rows for the type where the property is treated as a String fail to include the property.