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Test server: refused CancelTimer leaves the workflow task complete in memory but STARTED in history, so it is never timed out or redelivered

test serverRelated to the test serverRelated to the test server

Status: Open.

#3088 In temporalio/sdk-java;

· mjlodge opened on Sep 17, 2026

Warn if the SDK tried to send a payload above a specific size - Java

Status: Open.

#3059 In temporalio/sdk-java;

· jmaeagle99 opened on Sep 9, 2026

Allow configurable prefix for MDC keys

enhancementUser experienceUser experience

Status: Open.

#3058 In temporalio/sdk-java;

· tsurdilo opened on Sep 7, 2026

Promise.get(timeout, unit) throws a misleading TimeoutException when the workflow is canceled

Status: Open.

#3026 In temporalio/sdk-java;

· antmendoza opened on Aug 21, 2026

Timers are still not canceled if the condition is resolved

Status: Open.

#3012 In temporalio/sdk-java;

· rocketraman opened on Aug 15, 2026

[kotlin] Replaying a workflow history across different compiler versions (e.g. 2.2.0 → 2.4.0) can cause NDE

Status: Open.

#2989 In temporalio/sdk-java;

· antmendoza opened on Aug 4, 2026

Retry transient errors in ActivityCompletionClient.heartbeat

enhancementUser experienceUser experience

Status: Open.

#2984 In temporalio/sdk-java;

· dssysolyatin opened on Jul 31, 2026

Manual completion client's recordHeartbeat swallows cancellation, reset and pause exceptions

Status: Open.

#2983 In temporalio/sdk-java;

· dssysolyatin opened on Jul 31, 2026

Async.function/Async.procedure with a Kotlin method reference spawns a WorkflowThread per call instead of inlining, as it does the Java equivalent

Status: Open.

#2981 In temporalio/sdk-java;

· antmendoza opened on Jul 30, 2026

Add Spring AI 2.0.x / Spring Boot 4 support

ai-sdkRelated to AI integrationsRelated to AI integrations

enhancementUser experienceUser experience

Status: Open.

#2920 In temporalio/sdk-java;

· mneron-highnote opened on Jun 17, 2026

Jackson3JsonPayloadConverter(JsonMapper) constructor not visible to javac — only present in META-INF/versions/17/

Status: Open.

#2885 In temporalio/sdk-java;

· gauravthadani opened on May 20, 2026

SDK should log when WFT completion takes a long time - Java

Status: Open.

#2883 In temporalio/sdk-java;

· jmaeagle99 opened on May 19, 2026