Unable to fetch the json manifest

[johanpoirier]

When i try to fetch the json manifest with te following URL http://localhost:43201/e3ab7e31-2895-4c80-b69e-beb96776fec6/manifest, it always fail and print this error:

07-19 09:14:12.153 22200-22471/org.readium.r2reader I/System.out: ManifestHandler JsonGenerationException | JsonMappingException com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.json.JSONObject and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.readium.r2.shared.Publication["coverLink"]->org.readium.r2.shared.Link["properties"]->org.readium.r2.shared.Properties["json"])

I'm testing this on the develop branch. It gaves me the same output wether I'm using the streamer alone or in the r2-testapp-kotlin app.