JPA - disable inheritance on Subclass

My Class "Resource_Image" is a subclass of Resource and all things work as expected, but in my Database both tables containing the column "STRUCTURE". Why? Using setRs on an Resource_Image instance is setting Resource_Structure on superclass, but why i'm having the column "STRUCTURE" on Table "res_images" too, it doesn't make sense? See the Code at the bottom. Any Ideas? @Entity @Table(name="res") @Inheritance(strategy=InheritanceType.JOINED) public class Resource { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "ID") private Long id; @JoinColumn(name = "STRUCTURE",nullable=false) private Resource_Structure rs; //getter and setter for rs public final void setRs(Resource_Structure rs) { this.rs = rs; } //... } @Entity @Table(name="res_images") public class Resource_Image extends Resource { @Column(name = "WIDTH",nullable=false) private int width; @Column(name = "HEIGHT",nullable=false) private int height; //NO getter and setter for rs }

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