NPE in LinkCollectingAssociationHandler.doWithAssociation using SD MongoDB @DbRef Object [DATAREST-797]

Mark Paluch opened DATAREST-797 and commented

Spring Data Rest with Spring Data MongoDB runs into a NPE when using DbRef on Object typed properties in the domain class.

Model:

    @Data
    @NoArgsConstructor
    @Document(collection = "model")
    public static class Model {

        @Id
        private ObjectId id;
        private String name;

        @DBRef
        private Object posts;
    }

Stack-trace:

Caused by: java.lang.NullPointerException
	at org.springframework.data.rest.webmvc.mapping.LinkCollectingAssociationHandler.doWithAssociation(LinkCollectingAssociationHandler.java:101)
	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:353)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$LinkCollector.getLinksFor(PersistentEntityJackson2Module.java:643)

Affects: 2.4.4 (Gosling SR4), 2.5 RC1 (Hopper)

Reference URL: https://gist.github.com/mp911de/cd330c8a9c6bc056aa61c44fcb8714ac

Issue Links:

• DATAREST-796 NPE in PersistentPropertyResourceMapping.isExported using SD MongoDB @DbRef Object