Micronaut Repository - cannot inherit from final class

Issue

I encountered an error with one of my repository classes where I'm using JdbcOperations. This issue happened when I updated Micronaut from version 3.5.0 to 3.6.0.

Caused by: java.lang.IncompatibleClassChangeError: class com.myapp.repository.BulkUserMailSettingRepository$Intercepted cannot inherit from final class com.myapp.repository.BulkUserMailSettingRepository

@Repository
class BulkUserMailSettingRepository(private val jdbcOperations: JdbcOperations)

I can compile it by adding the @Singleton annotation, but I don't understand why.

Solution

Micronaut creates a subclass of your class and adds bean/query functionality there. You just need to make your class subclass-able by adding open:

@Repository
open class BulkUserMailSettingRepository(private val jdbcOperations: JdbcOperations)

Answered By - Burt Beckwith