When creating extensions that depend on other extensions... is there a way to actually load those dependencies reliably? Specifically, I'm trying to implement the

RoleProvider

interface that is defined in the druid-basic-security extension, but if I try to make my extension a standalone extension (using the

provided

scope for the

druid-basic-security

dependency in my

pom.xml

) I get

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/druid/security/basic/authorization/RoleProvider

... however if I shade the jar, then it does work. Also if I build it into

druid-basic-security

that also works. Am I missing something with how the interface might be implemented outside of this core extension package? Anyone have experience with this?

I’m not sure about the specific auth classs in question…but inter-extension dependency support was added here in 32.0.0, in case it’s useful: https://github.com/apache/druid/pull/16973

this looks extremely helpful! Thank you!

note, that PR was mainly to support a different use case: an extension needed to be able to use objects from another extension (not provide alternate implementations of an interface). It might work for your use case too, though. Worth a try

It actually did work!

🙌