Instead of creating an individual instance of JpaMetamodelMappingContext per repository we now register a unique instance with access to the metamodel of the EntityManager the repositories use under "jpaMappingContext".
Weakened the contract in JpaPersistentEntityImpl to allow multiple @Id properties (in case @IdClass is used). The mapping context now also allows looking up of embeddable types as they're considered entities in the context of Spring Data mapping metadata.
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