@GeneratedValue not generating id value in entity class

Question

my entity class trying to implement for stocks.java

@Entity @Table(name="stocks") public Class Stocks { @Id @GeneratedValue @Column(name = "stock_id") private Integer stocked; }

this my rest API controller I wrote stockcontroller.java

@RestController @RequestMapping("home/stocks") public class HomeController { @Autowired private StockRepo stocks; //POST: adds a new song to the repository @PostMapping("/add") public void addSong(@RequestBody(required = true) Stock stock) throws DuplicateItemException { if(stock.existsById(stock.stockId())) { throw new DuplicateItemException(); } stocks.save(song); }

}

It will only be generated when it is persisted, so a new one doesn't have an id. — M. Deinum
– M. Deinum, Commented Feb 22, 2022 at 16:34

frascu · Accepted Answer · 2022-02-22 16:46:54Z

You have to define the generation strategy.

For example you can replace @GeneratedValue with:

@GeneratedValue(strategy = GenerationType.IDENTITY)

or

@GeneratedValue(strategy = GenerationType.SEQUENCE)

or

@GeneratedValue(strategy = GenerationType.TABLE)

Of course, you have to put @Transactional on the method addSong to persist the entity.

vikas · Accepted Answer · 2022-02-22 16:30:07Z

change @GeneratedValue to @GeneratedValue(strategy = GenerationType.IDENTITY) or @GeneratedValue(strategy = GenerationType.SEQUENCE)

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