Immediately retrieve unique id

The beginning of my "Sample" class looks like:

@Entity

@SequenceGenerator(name = "sampleSeqGenerator", initialValue = 1, allocationSize = 100)

public class Sample implements Serializable {

  private static final long serialVersionUID = 1L;

  private String sampleName;

  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sampleSeqGenerator")

  @Id long id;

The id field is as expected when I browse the database: 1,2,3,4 etc.

I would like the field sampleName to be: SPL1, SPL2, SPL3 etc. that makes use of the id.

How do I capture that id without roundtripping?

I see pre and post commit, but pre the id isn't generated yet, and post I would have to somehow resave.

To obtain an automatic id on persist before commit use sequence or table strategy.