jamesfredley commented on issue #14639:
URL: https://github.com/apache/grails-core/issues/14639#issuecomment-5976959875

   Startup failed with a NullPointerException inside `ConcurrentHashMap.get` 
while `GrailsDomainClassMappingContext` was created. A Mongo domain that 
extended an abstract class in `src/groovy` was not treated as a root, and the 
missing parent was used as a map key.
   
   That Grails 2 entity type is gone. `AbstractPersistentEntity.isRoot()` is 
true when there is no parent, and a parent is registered only when the 
superclass is itself a persistent entity. Commit `a6a5cc3e61` is on `8.0.x`, 
`8.1.x`, and `9.0.x`, and it is in 7.0.17, 7.1.7, 7.2.4, and 8.0.0-RC2.
   


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