Hibernate does not generate Sequence when it's already available on a different schema - spring

Question

I have a "simple" Spring Boot application with a single datasource.
The following configuration is present in my configuration:
spring:
jpa:
hibernate:
ddl-auto: update
properties:
hibernate:
default_schema: CORE
flyway:
schemas:
- CORE
and the following ID Generator
#Id
#GeneratedValue(strategy = SEQUENCE, generator = "seq-pooled-lo")
#GenericGenerator(
name = "seq-pooled-lo",
strategy = "org.hibernate.id.enhanced.SequenceStyleGenerator",
parameters = {
#org.hibernate.annotations.Parameter(
name = SequenceStyleGenerator.INCREMENT_PARAM,
value = "50"
),
#org.hibernate.annotations.Parameter(
name = SequenceStyleGenerator.OPT_PARAM,
value = "pooled"
),
#org.hibernate.annotations.Parameter(
name = SequenceStyleGenerator.SEQUENCE_PARAM,
value = "seq_pooled_lo_sequence"
)
})
Now my issue is the following:
When I launch this app, it will create a sequence on the "CORE" schema. Everything works fine. Storing, retrieving data is no problem. When I then launch a second instance of the app but override the YAML file to define a different default_schema: SECOND it will not generate a new sequence on the "SECOND" schema. If I would first start the app with the "SECOND" schema defined and then start the one with "CORE" it would create the sequence on the "SECOND" schema and not on "CORE".
I would expect it to create different sequences on both schemas. Why does it not do that?
I also tried to add the sequence manually to the schema where it's missing but sadly that did not seem to help.

Answer 1

If you add the sequence manually to the schema.
You can create CustomIdGenerator Class as the example for return sequence id by defaultSchema
public class CustomIdGenerator implements IdentifierGenerator {
#Override
public Serializable generate(SessionImplementor sessionImplementor, Object o) throws HibernateException {
SequenceRepository sequenceRepository = ApplicationContextProvider.getApplicationContext().getBean(SequenceRepository.class);
Environment env = ApplicationContextProvider.getApplicationContext().getBean(Environment.class);
String defaultSchema = env.getProperty("yourproperty.default_schema");
return sequenceRepository.getSequence(defaultSchema);
}
}
Let's create SequenceRepository class for generate sequence. I assume that my database is Oracle.
NEXTVAL: Increments the sequence and returns the next value
public interface SequenceRepository extends JpaRepository<Object,Long> {
#Query(value = "SELECT ?1.NEXTVAL FROM DUAL", nativeQuery = true)
Long getSequence(String sequenceName);
}
and your Entity just edit strategy to using CustomGenerator Class
#Id
#GenericGenerator(name = "sequence_generator", strategy = "yourpackage.CustomIdGenerator")
#GeneratedValue(generator = "sequence_generator")
#Column(name = "id")
private Long id;