Highlights

Task Queue Fairness (Pre-release)

This release adds support for Task Queue Fairness. Fairness is a new feature of Temporal’s task queues that allows for more control over the order that tasks are dispatched from a backlog. It’s intended to address common situations like multi-tenant applications and reserved capacity bands. For more details see the javadoc's on io.temporal.common.Priority.

Fairness is currently not supported in any OSS Temporal release, but support will be coming soon. To experiment with this feature please see the pre-release development server or if you are a Temporal Cloud customer reach out to your SA to be enabled once it is available in Temporal Cloud.

Bugfixes

No longer retry "gRPC message size to large" error

The SDK will no longer retry "gRPC message size to large" errors or related errors. These errors occur if the user tries to make a gRPC request that exceeds the Temporal Service limits (typically 4 MB).

What's Changed

2025-06-26 - 68e4c4c - Add defaults for PollerBehaviorAutoscaling (#2574)
2025-06-27 - 4afe41b - Publish to Sonatype central (#2576)
2025-06-27 - a1eb7dc - Don't scale down on error if we have never seen a poller decision (#2575)
2025-07-03 - f919926 - Update snapshot URL (#2577)
2025-07-07 - fd648d1 - Fix flake in testNullTaskReleasesSlot (#2583)
2025-07-08 - 4acf674 - Update test server to v1.4.0 (#2587)
2025-07-08 - d310594 - Add support for activity reset (#2546)
2025-07-08 - d75b253 - Update Proto API to v1.50.0 (#2581)
2025-07-10 - bc5ab1d - When parsing operation token allow a zero version (#2591)
2025-07-10 - ca3a27a - Use correct operation token on OPERATION_TOKEN (#2589)
2025-07-17 - ffb44f9 - Remove @experimental notice from Update-with-start (#2599)
2025-07-22 - 76672fa - Fix ApplicationFailure.Builder handling a null Category (#2602)
2025-08-01 - 26546a7 - Fix using wrong config option for resource controller (#2607)
2025-08-11 - f9580aa - Align Nexus handler failure conversion with other SDKs (#2613)
2025-08-12 - b5057e8 - Fix adding a generic parameter failing (#2619)
2025-08-12 - cd76ad6 - Do not auto-retry gRPC-message-size-too-large errors (#2604)
2025-08-12 - ff939d7 - Nexus - Only pass a completion callback if a completion URL is provided (#2615)
2025-08-13 - 0dd76e0 - Add info on features test issue for CI (#2623)
2025-08-13 - 5b7e82c - Added retry options to ActivityInfo. Added ActivityInfo tests. (#2622)
2025-08-15 - acf7473 - Bump some Github actions (#2628)
2025-08-15 - b854df4 - Clarify NexusOperationCancellationType (#2630)
2025-08-15 - f2475c1 - Bump cloud api version to v0.7.1
2025-08-18 - 71c7426 - Fix Javadoc of io.temporal.workflow.Workflow#getVersion (#2631)
2025-08-19 - b6b4290 - Fairness Keys & Weights (#2633)
2025-08-20 - 943fe2e - Revert removing "Control" field (#2634)