为什么在使用策略GenerationType.IDENTITY时Hibernate尝试访问hibernate_sequence？

Question

In my project, I am using MySQL with Hibernate and JPA. My entities are all annotated with @ID @GeneratedValue(strategy = GenerationType.IDENTITY) .

Nevertheless, Hibernate tries to select the next ID from the table hibernate_sequence when inserting new objects into the database - which fails obviously.

I checked for the whole project whether a different generation type was used by accident on some entity, but this is not the case. What else could cause this problem?

This is the SQL i use to create my tables:

create table versioned_string_attribute (
  id int primary key auto_increment not null,
  timestamp timestamp,
  value text
);


create table backend_address (
  id int primary key auto_increment not null,
  street_id int references versioned_string_attribute(id),
  house_number_id int references versioned_string_attribute(id),
  zip_code_id int references versioned_string_attribute(id),
  town_id int references versioned_string_attribute(id),
  addition_id int references versioned_string_attribute(id)
);

And here is my application.properties

spring.jpa.generate-ddl=false
spring.jpa.hibernate.ddl-auto=none
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect
spring.datasource.driverClassName=com.mysql.jdbc.Driver

Answer 1

From the docs( https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#common-application-properties ) the property:

spring.jpa.hibernate.use-new-id-generator-mappings= # Whether to use Hibernate's newer IdentifierGenerator for AUTO, TABLE and SEQUENCE.

So I solved this issue by adding spring.jpa.hibernate.use-new-id-generator-mappings=false

More details about this: https://vladmihalcea.com/from-jpa-to-hibernates-legacy-and-enhanced-identifier-generators/