ObjectMapper configuration for json serialization

[laurent-treeb]

jmsdk/jackson-support/src/main/java/io/github/ma1uta/matrix/support/jackson/DefaultObjectMapperProvider.java

Line 41 in f159926

mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);

I replace mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY); with mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

I use my own http client with the mapper and the jeon model class
and with /_matrix/client/r0/keys/query, i had a bad request with NON_EMPTY because the serialization removes my empty list:

The Java object:

QueryRequest keysQuery = new QueryRequest(); keysQuery.setTimeout(5000L); Map<String, List<String>> devicesKeysRequest = new HashMap<>(); devicesKeysRequest.put(bobLogin.getUserId(), Collections.emptyList()); keysQuery.setDeviceKeys(devicesKeysRequest);

Serialized Json with NON_EMPTY => bad request:
{"timeout":5000}

Serialized Json with NON_NULL => good request:
{"timeout":5000,"device_keys":{"@a66bf63f-d9bc-41d1-99ce-467c2af61c26:matrix.docker.localhost":[]}}

In Matrix spec for /_matrix/client/r0/keys/query:
device_keys : {string: [string]} | Required. The keys to be downloaded. A map from user ID, to a list of device IDs, or to an empty list to indicate all devices for the corresponding user.