Custom Data type in extension

[saurabh kumar]

Is having a custom data type in extension supported, I was able to register a custom data type following https://hapifhir.io/hapi-fhir/docs/model/custom_structures.html and encode the resource object into json format as expected but when i try to parse the generated json back the extension value is null instead of an instance of custom data type object.

while debugging I noticed there is a check while building the context to include only standard types so the attribute name to class mapping is not populated , is there any other steps which needs to followed to register custom types for json parser.