Custom Function without META-INF service entry?

Hibernate ORM
1

Hello! I followed this excellent tutorial to migrate a custom function out of a Dialect and into a FunctionContributor:

This step is problematic, as our in-house pattern is to put all such kinds of configs into the application.yml:
The last step will be creating the Hibernate meta hint file in our classpath to instruct we want to register a custom FunctionContributor:
src/main/resources/META-INF/services/org.hibernate.boot.model.FunctionContributor

And on that file, add our custom function contributor full class name:
tech.aaregall.lab.hibernate6.persistence.functions.CustomFunctionsContributor

Can the reference to our CustomFunctionsContributor be expressed in the yaml somehow?

Thank you!

1 Like
2

As you can find in FunctionContributorā€™s javadoc, there are programmatic alternatives to register custom implementations other than registering Java service:

  • org.hibernate.cfg.Configuration#registerFunctionContributor
  • org.hibernate.boot.MetadataBuilder#applyFunctions

You should always call one of these methods before constructing the SessionFactory used in the application where you want your custom functions to be available.

3

Thanks for the kind words on my humble blog post! :heart_eyes:

Iā€™m not sure if loading contributors dynamically from a YAML file is possible (I guess your intend is to apply Spring auto configuration fashion to Hibernate function contributors).

AFAIK @mbladel answer to me looks like the closest approach you could follow to dynamically register contributors - I have never tried it nor had the need though.