Enum Translation with Collections of Enums throws NullPointer [DATAREST-929]

Mathias D opened DATAREST-929 and commented

Deserialization of Collections of enums with enum translation turned on fails with a NullPointerException

Caused by: java.lang.NullPointerException: null
	at org.springframework.data.rest.webmvc.json.EnumTranslator.resolveEnum(EnumTranslator.java:148) ~[spring-data-rest-webmvc-2.5.4.RELEASE.jar:na]
	at org.springframework.data.rest.webmvc.json.EnumTranslator.fromText(EnumTranslator.java:120) ~[spring-data-rest-webmvc-2.5.4.RELEASE.jar:na]
	at org.springframework.data.rest.webmvc.json.JacksonSerializers$EnumTranslatingDeserializer.deserialize(JacksonSerializers.java:184) ~[spring-data-rest-webmvc-2.5.4.RELEASE.jar:na]
	at org.springframework.data.rest.webmvc.json.JacksonSerializers$EnumTranslatingDeserializer.deserialize(JacksonSerializers.java:128) ~[spring-data-rest-webmvc-2.5.4.RELEASE.jar:na]
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:277) ~[jackson-databind-2.8.3.jar:2.8.3]

In this case, the type passed into EnumTranslator#fromText is e.g. java.util.Set where it should be the type contained in the collection. So EnumTranslatingDeserializer#deserialize could be enhanced with a special handling for arrays and collections

Affects: 2.5.4 (Hopper SR4)

Referenced from: pull request https://github.com/spring-projects/spring-data-rest/pull/234