Provide ready to use json serializer(something based on jackson)

[nikolavp]

This should be included as a submodule:

1. Move the current main project as a submodule named approval-core
2. Create approval-json submodule that contains the json converter implementation

[powerslider]

public class JacksonJsonConverter<T> extends AbstractStringConverter<T>  {
    private ObjectMapper mapper = new ObjectMapper()
            .enable(SerializationFeature.INDENT_OUTPUT)
            .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);

    @Nonnull
    @Override
    protected String getStringForm(T entity) {
        try {
            return mapper.writeValueAsString(entity);
        } catch (JsonProcessingException e) {
            throw new RuntimeException("Could not convert " + entity.getClass() + "object", e);
        }
    }
}

[powerslider]

I think that this converter is more beneficial because it can recursively serialize any other entities within your current one. For example:

class Foo {
    private String name;
    private Bar bar;
}

class Bar {
   private String name;
   private String color;
}

As a result if you convert Foo your serialiazed format would look like this:

{
  "name" : null,
  "bar" : {
         "name" : null,
         "color" : null
  }
}