Register FunctionContributor programmatically

Hibernate ORM
1

Hi there,

I am currently migrating projects from Hibernate 5 to Hibernate 6 and I have to use FunctionContributors to provide some function descriptors for different databases. So far this is fine and I understand how to register them through the Java Service Loader.

Then I created some tests to verify behaviour before and after the migration. And these tests are required for PostgreSQL and Oracle databases. But I cannot register FunctionContributors for different databases though the Java Service Loader. At least I am not aware of it.

I checked the javadoc of FunctionContributor (FunctionContributor (Hibernate Javadocs)). It mentions org.hibernate.cfg.Configuration#registerFunctionContributor or org.hibernate.boot.MetadataBuilder#applyFunctions. But I am working with Spring and JPA projects and did not find any information on how to access an object of any of those.

So I switched to using a MetadataBuilderContributor, but it is deprecated and marked for removal.

Does anybody have an idea, how to access Configuration or MetadataBuilder through a Spring configuration? I am only aware of DataSource, JpaTransactionManager, LocalContainerEntityManagerFactoryBean and some Hibernate properties.

Or are there other alternatives to register FunctionContributors? Please let me know.

Kind regards,
Marko Skocibusic

2

Use FunctionContributions#getDialect() and register the functions you want based on the dialect class.

3

Thank you Christian, that was the hint I needed. And it is working perfectly fine!