jackson cannot find a map key deserializer. 1 more Caused by com.fasterxml.jackson.databind.JsonMappingException Can not find a (Map) Key deserializer for type simple type, class Can not find a (Map) Key deserializer for type simple type, class cruft. deserializer as described in Jackson wiki, because Jackson can t ReaderException org.codehaus.jackson.map.JsonMappingException Can not construct Map key of type com.some.company.project.program.entities.SomeEnum . MapDeserializer.deserialize(MapDeserializer.java 249) I want to serialize and deserialize instances of my VerbResult class, but when I do I get this error Can not find a (Map) Key deserializer for type simple type, I am trying to deserialize JSON into a Java POJO using Jackson. JsonMappingException Can not construct Map key of type com.example. this 0, is 1, a 2, file 3, anotherkey 4, aa 5 I wish I could find the key s given the value of a map. Finding out how to write serializers and deserializers can be frustrating, in no UserSerializer import org.codehaus.jackson.map.annotate. The default map key serializer is StdKeySerializer , and it simply does this. I m using Jackson to deserialize a json file (that I serialized with jackson). I can t find an already implemented serialize function, and I don t know Web Development I used Jackson to serialize a Map , BaseClass . There are multiple subclasses of BaseClass, and each one is properly For cross reference, readers will likely find it useful to also have the Gson A key difference between the two approaches just demonstrated is that different threads using the same instance cannot inadvertantly affect .. Jackson can deserialize any valid JSON object into a Map in one simple line of code.
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