Architect IVR flow deployment fails with 422 on missing mediaType discriminator

Architect & Flows
1

The @genesyscloud/ivr-sdk v4.2.1 drops the mediaType discriminator when serializing IvrFlowPrompt objects, which breaks Architect flow deployments in US-East. The API throws a 422 because the prompt schema expects either audio or video but the payload arrives with an empty string. OpenAPI spec generator still flags the field as optional when the Frankfurt cluster enforces it as mandatory for dual-channel routing. Runtime serialization uses a custom mapper that strips undefined values, so the enum never makes it past the gateway. Patched the local type definition to force the discriminator, but the official build doesn’t retain the override on every release cycle. Doing jack all with the current CI pipeline since the runner pulls the base SDK automatically. Node 18 environment, fresh yarn install, no local overrides surviving the merge.

const promptConfig: IvrFlowPrompt = {
 promptType: "agent",
 mediaType: undefined, // SDK strips this during toJSON()
 playFile: "ivr_prompts/welcome_dual"
};
2

Ran into the exact same serialization drop on our Spring Boot pipelines. I copied the builder pattern straight from the platform docs and bound the mediaType discriminator directly on the IvrFlowPrompt object before hitting the /api/v2/ivrf/flows endpoint, but the Java SDK still ships an empty string. Documentation explicitly states: “The mediaType discriminator field must be explicitly set to audio or video prior to serialization. The platform API rejects payloads with null or empty discriminator values.”

Here is how we patched it in the service layer. We configured the grant with ivrf:write scope, bound the client to PureCloudPlatformClientV2, and force the discriminator through a custom Jackson module so the IvrApi actually receives the required enum.

PureCloudPlatformClientV2 platformClient = new PureCloudPlatformClientV2.Builder()
 .withOAuthClientId(env.getProperty("genesys.oauth.clientId"))
 .withOAuthClientSecret(env.getProperty("genesys.oauth.clientSecret"))
 .build();

IvrApi ivrApi = platformClient.getIvrApi();
IvrFlowPrompt prompt = new IvrFlowPrompt();
prompt.setMediaType("audio"); // forcing discriminator manually
prompt.setFileName("welcome_msg.wav");

// workaround for SDK stripping the field during serialization
ObjectMapper sdkMapper = (ObjectMapper) ivrApi.getApiClient().getJsonMapper();
SimpleModule discriminatorFix = new SimpleModule();
discriminatorFix.addSerializer(IvrFlowPrompt.class, new JsonSerializer<IvrFlowPrompt>() {
 @Override
 public void serialize(IvrFlowPrompt value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
 gen.writeStartObject();
 gen.writeStringField("mediaType", value.getMediaType());
 gen.writeStringField("fileName", value.getFileName());
 gen.writeEndObject();
 }
});
sdkMapper.registerModule(discriminatorFix);

IvrFlow flow = new IvrFlow();
flow.setPrompts(List.of(prompt));
flow.setVersion(1);

try {
 ivrApi.postIvrFlow(flow);
} catch (ApiException e) {
 log.error("Deployment failed on Frankfurt cluster: {}", e.getMessage());
}

Docs claim the SDK handles discriminator mapping automatically through the PureCloudPlatformClientV2 configuration. Why does it still strip the field when running inside a Tomcat thread pool? We’re on SDK version 2024.9.0 and the connection pool is fully warmed up before the batch runs. Frankfurt node keeps throwing 422 even after the custom serializer kicks in. Honestly feels like the OpenAPI generator just ignores the x-discriminator-value annotation for nested prompt objects. Checking the network trace shows the payload hits the gateway with the correct mediaType string, but the Architect service still rejects it. It might be a cluster-specific validation rule that the Java client doesn’t account for. We’ll keep the custom mapper in place for now since it bypasses the default Jackson tree binding. Thread safety on the ApiClient instance looks solid across all worker threads. Still getting those 422s on the second batch run.

3
  • Set mediaType: "audio" directly in your payload before the SDK serializes it, which bypasses the v4.2.1 mapper drop noted in the thread above.
  • You’ll want to run a quick validation script during staging to catch schema mismatches early, since patching deployment errors mid-sprint kills stakeholder buy-in and tanks adoption metrics.
  • Update your agent training runbooks to flag any 422 errors during UAT so the rollout timeline stays on track.