JPA中使用序列的约束违例异常

Question

I am using Spring Data in my project and using JPA for mapping between the entity and my table, this is my entity

public class daoTable {

@Id
@SequenceGenerator(name = "seq_table_nc", sequenceName = "SEQ_TABLE_NC")
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "seq_table_nc")
private Long id;
// setter && getter && outher params
}

and this is my Repo

public interface daoTable Repository extends JpaRepository<daoTable , Long>, JpaSpecificationExecutor<daoTable >{}

when I try to save I get this problem :

1. org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [GQAO.PK_RT]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
2. java.sql.SQLIntegrityConstraintViolationException: ORA-00001: violation de contrainte unique

Answer 1

This can happen if you already have records in database with the same values as your SequenceGenerator will generate.

For example if I save 1 record without using this SequenceGenerator ( seq_table_nc ) after that add it in the code this SequenceGenerator ( seq_table_nc ) and try to save I will get the exception that you have because the generator can give me value that is equal to value that I already have in database.

Generally you should check which value try to save in DB for id . After that you have to see how to update your database SequenceGenerator so it start generate unique values.

Good luck!