When you make mistakes you learn more. Since this is true I can tell you that I am learning a lot every day.
Today I learned that your id field type in the entity need to be the same as the generics in the interface that implements the Spring Repository (CrudRepository in my case).
My entity has some code similar to this:
@Entity
public class Table {
@Id
@GeneratedValue
private Long id;
// more fields
}
And the code for the Repository is something similar to this:
public interface TableRepository extends CrudRepository<Table, Long> {
}
My mistake today was that my id field in the Table class was a int. My Spring application was returning this generic error message:
Could not execute JDBC batch update; SQL [insert into Table (name, id) values (?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
Bonus: I also learned that it will throw the same error if you try to insert twice the same name value.
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