Hibernate : How override an attribute from mapped super class

Question

The generic entity, super class:

@MappedSuperclass public abstract class GenericEntity {     private Integer id;     public Integer getId() {return id;}     public void setId(Integer id) {this.id = id;} } 

The pojo:

@Entity @Table(name = "POJO_ONE") @SequenceGenerator(name = "HB_SEQ_POJO_ONE", sequenceName = "SEQ_POJO_ONE", allocationSize = 1) public class PojoOne extends GenericEntity {      @Id     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "HB_SEQ_POJO_ONE")     @Column(name = "ID")     @AttributeOverride(name = "id", column = @Column(name = "ID"))     private Integer id;      @Override     public Integer getId() {return id;} } 

I try to use thoses annotations : @AttributeOverride, @Id, ... but It doesn't work. Can you help me? I want to override the attribute "id" to specify another column name and a sequence by pojo/table. What is the best way to do that?

Answer 1

Try this, instead

@MappedSuperclass public abstract class GenericEntity {     protected Integer id;     ...      public Integer getId() {return id;}     public void setId(Integer id) {this.id = id;} }   @Entity @Table(name = "POJO_ONE") @SequenceGenerator(name = "HB_SEQ_POJO_ONE", sequenceName = "SEQ_POJO_ONE", allocationSize = 1) @AttributeOverride(name = "id", column = @Column(name = "ID")) public class PojoOne extends GenericEntity {     // we should not define id here again     ...      @Override     @Id     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "HB_SEQ_POJO_ONE")     public Integer getId() {return id;} } 

Answer 2

Why don't you annotate the id of GenericEntity with @Id? You also should not redefine id but put the @AttributeOverride(name = "id", column = @Column(name = "ID")) on the class rather than a field.

Edit:

We're using this in our base class (package.OurTableGenerator is our own implementation):

@GeneratedValue ( generator = "ourTableGenerator", strategy = GenerationType.TABLE ) @GenericGenerator ( name = "ourTableGenerator", strategy = "package.OurTableGenerator",   parameters = { @Parameter ( name = OurTableGenerator.TABLE_PARAM, value = "t_sequence" ),                  @Parameter ( name = OurTableGenerator.SEGMENT_COLUMN_PARAM, value = "c_entity" ),                  @Parameter ( name = OurTableGenerator.VALUE_COLUMN_PARAM, value = "c_nextHi" ),                  @Parameter ( name = OurTableGenerator.INCREMENT_SIZE_COLUMN_PARAM, value = "c_blocksize" ) } ) @Id @Column(name = "c_uid") private Long uid; 

This let's us specify a differenc block size and sequence per entity/table.

For your own table generator you could subclass org.hibernate.id.TableGenerator.