@Override
    public void serialize(Region.Entry value, JsonGenerator gen, SerializerProvider serializers)
        throws IOException {
      gen.writeStartObject();
      gen.writeObjectField(value.getKey().toString(), value.getValue());
      gen.writeEndObject();
    }
A custom JSON serializer for region entries.
geode-core/src/main/java/org/apache/geode/management/internal/json/AbstractJSONFormatter.java