[ACCEPTED]-Persisting an entity when ID is null and automatically generated in the database-glassfish-4
Accepted answer
Do not use @NotNull constraint on @Id attribute generated 6 using GenerationType.IDENTITY strategy.
The problem is @NotNull and other 5 JSR-303 constraints are validated before commit.
And 4 the autoincremented identifier isn't available 3 until after the commit completes.
Try this 2 and don't care about ID initialization any 1 more:
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "IDENTIFIER", nullable = false, unique = true)
private Long identifier;
When I'm using auto increment at the identifier 2 I do like this:
User user = new User();
user.setIdentifier((long) 0);// Assign 0 to ID for MSSQL/MySQL to properly auto_increment the primary key.
user.setUserName("some name");
...
With this Annotation for 1 the id:
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@NotNull
@Column(name = "ID")
private Long id;
Source:
stackoverflow.com
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