Slaapstand en Oracle-reeks

U moet allocationSize set instellen naar 1

@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "student_id_seq")
@SequenceGenerator(name = "student_id_seq", 
                   sequenceName = "Student_seq",
                   allocationSize = 1)  

U kunt meer lezen in documentatie SequenceGenerator doc