iothub: keep Java device-twin free-form maps as Object via alternateType - #44820
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weidongxu-microsoft merged 1 commit intoJul 21, 2026
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RoutingTwin.tags, RoutingTwinProperties.desired and RoutingTwinProperties.reported are Record<unknown> in the spec, which the Java emitter maps to Map. Prior releases generated Object, so the current generation introduces a breaking change on the Java public surface (Object -> Map; withReported(Object)/withDesired(Object)/withTags(Object) removed). Add alternateType(..., unknown, java) to restore Object for Java only; other languages keep the more specific Map. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 96bded02-7a23-4e40-868b-7d3cd5bab141
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Summary
Restores the backward-compatible Java client surface for IoT Hub device-twin free-form maps.
RoutingTwin.tags, RoutingTwinProperties.desired, and RoutingTwinProperties.reported are modeled as
Record<unknown>inmodels.tsp, which the Java emitter maps toMap. Prior releases (api-version2025-08-01-preview,azure-resourcemanager-iothub1.4.0-beta.2) generatedObjectfor these properties. The current generation therefore introduces a breaking change on the Java public API:java.lang.Object reported()->java.util.Map reported()java.lang.Object desired()->java.util.Map desired()java.lang.Object tags()->java.util.Map tags()withReported(Object)/withDesired(Object)/withTags(Object)removedChange
Add
@@alternateType(..., unknown, "java")inclient.tspfor the three properties. TypeSpecunknownmaps to JavaObject, so the Java client keeps the originalObjectsurface while other languages continue to use the more specificMap. No wire/protocol change.This mitigates the breaking changes observed in azure-sdk-for-java PR #49868.