Not able to ignore fields while updating entity.

Below I have a simple entity code
Where I don't want createdDateTime to get updated to null when I am not passing it in parameters.

as of now .save() method saving null value in createdDateTime.

```
public class Test{

  private String name;
  private String desc;

  @Transient // not working
  @column(updatable=false) //not working
  private LocalDateTime createdDateTime;

}
```