I tried to upgrade hibernate from 4 to 5 in my project with spring 4.2
version. After this upgrade, I found the following error in my stack trace when I called a method for updating.
10:53:32,185 ERROR TableStructure:149 - could not read a hi value
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'test.hibernate_sequence' doesn't exist
I changed the auto incremented Id with annotation
@GeneratedValue(strategy=GenerationType.AUTO)
still the error remains.
This is the reason behind this error:
It will look for how the database that you are using generates ids. For MySql or HSQSL, there are increment fields that automatically increment. In Postgres or Oracle, they use sequence tables. Since you didn't specify a sequence table name, it will look for a sequence table named hibernate_sequence and use it for default. So you probably don't have such a sequence table in your database and now you get that error.
This might be caused by HHH-10876 which got fixed so make sure you update to:
When you use
@GeneratedValue(strategy=GenerationType.AUTO)
or
@GeneratedValue
which is short hand way of the above, Hibernate starts to decide the best
generation strategy for you, in this case it has selected
GenerationType.SEQUENCE
as the strategy and that is why it is looking for
schemaName.hibernate_sequence
which is a table, for sequence based id generation.
When you use GenerationType.SEQUENCE
as the strategy you need to provide the @TableGenerator
as follows.
@Id
@GeneratedValue(strategy = GenerationType.TABLE, generator = "user_table_generator")
@TableGenerator(name = "user_table_generator",
table = "user_keys", pkColumnName = "PK_NAME", valueColumnName = "PK_VALUE")
@Column(name = "USER_ID")
private long userId;
When you set the strategy it the to
@GeneratedValue(strategy = GenerationType.IDENTITY)
.
original issue get resolved because then Hibernate stop looking for sequence table.
In my case, replacing all annotations GenerationType.AUTO
by GenerationType.SEQUENCE
solved the issue.
You can also put :
@GeneratedValue(strategy = GenerationType.IDENTITY)
And let the DateBase manage the incrementation of the primary key:
AUTO_INCREMENT PRIMARY KEY
FYI
If you are using hbm files to define the O/R mapping.
Notice that:
In Hibernate 5, the param name for the sequence name has been changed.
The following setting worked fine in Hibernate 4:
<generator class="sequence">
<param name="sequence">xxxxxx_seq</param>
</generator>
But in Hibernate 5, the same mapping setting file will cause a "hibernate_sequence doesn't exist" error.
To fix this error, the param name must change to:
<generator class="sequence">
<param name="sequence_name">xxxxxx_seq</param>
</generator>
This problem wasted me 2, 3 hours.
And somehow, it looks like there are no document about it.
I have to read the source code of org.hibernate.id.enhanced.SequenceStyleGenerator to figure it out
Just in case someone pulls their hair out with this problem like I did today, I couldn't resolve this error until I changed
spring.jpa.hibernate.dll-auto=create
to
spring.jpa.properties.hibernate.hbm2ddl.auto=create
I was getting the same error "com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'mylocaldb.hibernate_sequence' doesn't exist".
Using spring mvc 4.3.7 and hibernate version 5.2.9, application is made using spring java based configuration. Now I have to add the hibernate.id.new_generator_mappings
property mentioned by @Eva Mariam in my code like this:
@Autowired
@Bean(name = "sessionFactory")
public SessionFactory getSessionFactory(DataSource dataSource) {
LocalSessionFactoryBuilder sessionBuilder = new LocalSessionFactoryBuilder(dataSource);
sessionBuilder.addProperties(getHibernateProperties());
sessionBuilder.addAnnotatedClasses(User.class);
return sessionBuilder.buildSessionFactory();
}
private Properties getHibernateProperties() {
Properties properties = new Properties();
properties.put("hibernate.show_sql", "true");
properties.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
properties.put("hibernate.id.new_generator_mappings","false");
return properties;
}
And it worked like charm.
You can also put :
@GeneratedValue(strategy = GenerationType.IDENTITY)
And let the DateBase manage the incrementation of the primary key:
AUTO_INCREMENT PRIMARY KEY
The above answer helped me.
Run this query
create sequence hibernate_sequence start with 1 increment by 1
If you are using Hibernate version prior to Hibernate5 @GeneratedValue(strategy = GenerationType.IDENTITY)
works like a charm. But post Hibernate5 the following fix is necessary.
@Id
@GeneratedValue(strategy= GenerationType.AUTO,generator="native")
@GenericGenerator(name = "native",strategy = "native")
private Long id;
DDL
`id` BIGINT(20) NOT NULL AUTO_INCREMENT PRIMARY KEY
REASON
Excerpt from hibernate-issue
Currently, if the hibernate.id.new_generator_mappings is set to false, @GeneratedValue(strategy = GenerationType.AUTO) is mapped to native. If this property is true (which is the defult value in 5.x), the @GeneratedValue(strategy = GenerationType.AUTO) is always mapped to SequenceStyleGenerator.
For this reason, on any database that does not support sequences natively (e.g. MySQL) we are going to use the TABLE generator instead of IDENTITY.
However, TABLE generator, although more portable, uses a separate transaction every time a value is being fetched from the database. In fact, even if the IDENTITY disables JDBC batch updates and the TABLE generator uses the pooled optimizer, the IDENTITY still scales better.
I added Hibernate sequence in postgres. Run this query in PostGres Editor:
CREATE SEQUENCE hibernate_sequence
INCREMENT 1
MINVALUE 1
MAXVALUE 9223372036854775807
START 2
CACHE 1;
ALTER TABLE hibernate_sequence
OWNER TO postgres;
I will find out the pros/cons of using the query but for someone who need help can use this.
in hibernate 5.x, you should add set hibernate.id.new_generator_mappings to false in hibernate.cfg.xml
<session-factory>
......
<property name="show_sql">1</property>
<property name="hibernate.id.new_generator_mappings">false</property>
......
</session-factory>
Working with Spring Boot
Put the string below in .application.properties
spring.jpa.properties.hibernate.id.new_generator_mappings=false
On Hibernate 4.X this attribute defaults to true
.
Source: Stackoverflow.com