No suitable constructor found for type when we use an Enum - Jackson JSON

I got a class that looks like this:

   public class Content {

        public enum Type {
            TEXT, URL, FILE
        }

        public enum Rendering {
            MARKDOWN, HTML, PLAIN, AUTO
        }

        public final Type type;
        public final Rendering rendering;
        public final String content;

        public Content(Type type, Rendering rendering, String content) {
            this.type = type;
            this.rendering = (rendering != null ? rendering : Rendering.AUTO);
            this.content = content;
        }

    }

And I got a JSON string that looks like this:

{
    "type": "TEXT",
    "rendering": "AUTO",
    "content": "Lorem ipsum"
}

Now, because fields in Content class is final, Jackson won't work, so I use MixIns:

    public abstract static class ContentMixIn {
        @JsonCreator
        public ContentMixIn(@JsonProperty("type") Type type,
                @JsonProperty("rendering") Rendering rendering,
                @JsonProperty("content") String content) {
        }
    }

Note: I could have annotated the original class using the constructor parameters, but Content is from a library which I cannot modify

And this is how I use them:

    // ... 
    SimpleModule module = new SimpleModule();
    module.setMixInAnnotation(Content.class, ContentMixIn.class);
    ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(module);
    mapper.readValue("<the json>", Content.class);

This would throw:

com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.foo.Content]: can not instantiate from JSON object (need to add/enable type information?)
 at [Source: {
    "type": "TEXT",
    "rendering": "AUTO",
    "content": "Lorem ipsum"
}; line: 2, column: 2]
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1063)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:264)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:124)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3051)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2146)

Why? By simpley looking at the line number, I assume It's complaining about the enum Type, but how do I correct this?

PS: MixIn is setup correctly because when I replace my Content constructor's enum paramater with String values, it works(although not the way I want it):

        // ... in the Content class
        public Content(String type, String rendering, String content) {
            this.type = null;
            this.rendering = null; 
            this.content = content;
        }

        // ... in the mixin class
        @JsonCreator
        public ContentMixIn(@JsonProperty("type") String type,
                            @JsonProperty("rendering") String rendering,
                            @JsonProperty("content") String content) {
        }