Change field case with an ObjectMapper

Question

I think I need to create a specialist ObjectMapper and cannot find any sample code to start the process.

The creator of the JSON is using .Net

Answer 1

Your first issue can be addressed very simply with the @JsonProperty annotation:

// java-side class
public class Facet
{
    @JsonProperty("Name")
    public String name;

    @JsonProperty("Value")
    public String value;
}

Now the ObjectMapper will match up the differently-cased field names. If you don't want to add annotations into your classes, you can create a Mix-in class to stand in for your Facet:

public class FacetMixIn
{
    @JsonProperty("Name")
    public String name;

    @JsonProperty("Value")
    public String value;
}

objectMapper.getDeserializationConfig().addMixInAnnotations(Facet.class, FacetMixIn.class);

This will achieve the same thing, without requiring additional annotations in your Facet class.