When class is annotated with @MappedSuperclass, its private fields can't be accessed from JPA with native image

[Tomas-Kraus]

Environment Details

• Helidon Version: 2.0.0
• Helidon MP
• JDK version: 11.0.7
• GraalVM version: CE 20.1.0
• OS: any

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Problem Description

In JPA entity inheritance model, @MappedSuperclass is used to annotate abstract entities which are extended as @entity annotated persistence bean classes.
When @MappedSuperclass annotated class is used in native image it's private fields are not visible to Hibernate.

Steps to reproduce

jUnit test in tests/integration/jpa of bug fixing PR, run with -Pnative-image -Dnative-image arguments