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java.lang.NullPointerException: null	at org.springframework.data.rest.core.mapping.PersistentPropertyResourceMapping.isExported(PersistentPropertyResourceMapping.java:84)	at org.springframework.data.rest.core.mapping.MappingResourceMetadata.isExported(MappingResourceMetadata.java:77)	at org.springframework.data.rest.webmvc.mapping.AssociationLinks.isLinkableAssociation(AssociationLinks.java:95)	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$AssociationUriResolvingDeserializerModifier.updateBuilder(PersistentEntityJackson2Module.java:339)	at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:240)