Implements Retries 2.1 Updates (#6925)

* Introduce AWS_NEW_RETRIES_2026 feature gate

This property will be used to gate the retries update (v 2.1) behind a
feature flag. This option defaults to false.

* Use AWS_NEW_RETRIES_2026 during mode resolution (#6872)

* Use AWS_NEW_RETRIES_2026 during mode resolution

* Review comments

* 2.1 behavior in standard, adaptive strats (#6871)

* 2.1 behavior in standard, adaptive strats

Support the 2.1 behavior changes in adaptive and standard strategies.
This includes the change in constant values based on 2.0 and 2.1, and
the application of a different cost for throttling retries in 2.1.

The 2.1 behavior is implemented as an overload of the builder() method
that accepts a boolean to select between 2.0 and 2.1. The no-arg version
defaults to false, i.e. 2.0.

* Review comments

* Factor new retries option in client builder (#6887)

* Factor new retries option in client builder

This commit updates the retry mode resolution behavior for SDK clients:

 - When resolving the RetryStrategy to use, also determine whether retry
   2.1 behavior should be enabled for that retry strategy.
 - If the `newRetries2026Default` property is set in
   customization.config for a service, ensure that this is treated as
   the default option for `AWS_NEW_RETRIES_2026` when building the
   client if not set anywhere else.

* Fix test

* Fix test

* Support backoff for long-polling (#6899)

* Support backoff for long-polling

For operations that are long-polling, support backoffs in the Standard
retry strategy even there is insufficient retry quota.

* Review comments

* Fix checkstyle

* Add longPolling exec param and use in retries (#6902)

This commit
 - Adds an isLongPolling() property to ClientExecutionParams
 - Adds SdkInternalExecutionAttribute.IS_LONG_POLLING that reflects the
   value from ClientExecutionParams during execution
 - Sets the longPolling() property on teh RefreshRetryTokenRequest when
   refreshing, based on the value of the IS_LONG_POLLING exec attribute

* Set longPoll ops for SQS,SWF,SFN (#6905)

* Set longPoll ops for SQS,SWF,SFN

Add a customization to set the long polling trait for the following
service operations:

 - SQS#ReceiveMessage
 - SFN#GetActivityTask
 - SWF#PollForActivityTask
 - SWF#PollForDecisionTask

* Checkstyle fix

* Review comments

* Fix checkstyle

* Add test cases for Standard (#6911)

This commit adds the test cases defined in the retries spec for
Standard. There are two sets, for v2.0 and v2.1.

All of the v2.0 test cases are present, but v2.1 tests don't currently
have the x-amz-retry-after header tests (yet).

* Support backoff on refresh failure (#6912)

Retry strategies can optionally return a backoff even when token refresh
fails. Add support for this in the sync and async retry stages.

In RetryableStage and AsyncRetryableStage, check the value of
TokenAcquisitionFailedException#delay() backoff if given.

* Use x-amz-retry-after for suggested delay (#6914)

* Use x-amz-retry-after for suggested delay

In retries 2.1, 'x-amz-retry-after' must be parsed from the last
response and if present, should be used as the suggested delay (i.e.
suggested backoff) when attempting another retry.

This changes makes updates to RetryableStage and AsyncRetryableStage to
parse the header and pass it to the RetryStrategy. As part of this
change, we also need to plumb whether retries 2.1 is enabled from the
SDK client.

* Review comments

* Retries fixes (#6920)

This commit fixes two issues with the original retries implementation:

 - Honor the 'max_retries' property in the profile file if present
 - Treat 'LimitExceededException' as a throttling exception

* Update DDB retry policy with v2.1 constants (#6917)

In 2.1:
 - base delay : 25ms (existing)
 - max attempts: 4 (down from 9)

* Retries 2.1 std suggested delay computation (#6915)

For standard 2.1, there is additional treatment of the service suggested
backoff so it's at least as long as the strategy computed value, and not
longer than 5s more than the strategy computed value.

* Add changelog entry

* Bump version to 2.44.0

* Change retries 2.1 builder param to nullable (#6927)

This will allow us to better track opt-in behavior in the UA.

* Retry on IDPCommunicationError (#6923)

This commit adds a fix to STS to retry on IDPCommunicationError. This is
implemented as a customization for the retry strategy lookup for the
client. This is gated behind the AWS_NEW_RETRIES_2026 flag.

* Update changelog

Author: dagnir

.changes/2.43.0.json .changes/2.43.x/2.43.0.json.changes/2.43.0.json renamed to .changes/2.43.x/2.43.0.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "AWS SDK for Java v2",
+    "contributor": "",
+    "description": "Added support for v2.1 retry behavior behind the `AWS_NEW_RETRIES_2026` feature gate. When enabled via environment variable `AWS_NEW_RETRIES_2026=true` or system property `-Daws.newRetries2026=true`, the SDK applies the following changes:\n\n- Uses `STANDARD` as the default retry mode\n- Reduces base backoff delay from 100ms to 50ms\n- Differentiates token costs between transient and throttling errors\n- Honors the `max_attempts` profile property\n- Uses the `x-amz-retry-after` response header for server-suggested delays\n- Retries on `LimitExceededException` as a throttling error\n- Retries on STS `IdpCommunicationErrorException`\n- Reduces DynamoDB default max attempts from 9 to 4\n- Backs off before failing long-polling operations (e.g., SQS `ReceiveMessage`) when the retry token bucket is exhausted, instead of failing immediately\n\nExample usage:\n```java\nSystem.setProperty(SdkSystemSetting.AWS_NEW_RETRIES_2026.property(), \"true\");\nDynamoDbClient ddb = DynamoDbClient.create();\n```"
+}

.changes/2.43.1.json .changes/2.43.x/2.43.1.json.changes/2.43.1.json renamed to .changes/2.43.x/2.43.1.json

@@ -1,175 +1 @@
  #### 👋 _Looking for changelogs for older versions? You can find them in the [changelogs](./changelogs) directory._
-# __2.43.2__ __2026-04-30__
-## __AWS SDK for Java v2__
-  - ### Features
-    - Updated endpoint and partition metadata.
-
-  - ### Bugfixes
-    - Improved error message when `ResponseTransformer.toFile()` or `AsyncResponseTransformer.toFile()` fails because the parent directory does not exist. The error now indicates that the parent directory must be created before calling the method.
-
-## __AWS Single Sign-On Admin__
-  - ### Features
-    - Add InstanceArn and IdentityStoreArn in the response of CreateApplication API and IdentityStoreArn in the response of DescribeApplication API
-
-## __Amazon Bedrock AgentCore__
-  - ### Features
-    - AgentCore Identity now supports on-behalf-of token exchange OAuth2. AgentCore Memory now supports metadata for LongTerm Memory Records.
-
-## __Amazon Bedrock AgentCore Control__
-  - ### Features
-    - AgentCore Identity now supports on-behalf-of token exchange OAuth2. AgentCore Memory now supports metadata for LongTerm Memory Records.
-
-## __Amazon DataZone__
-  - ### Features
-    - Adds support for asynchronous notebook runs
-
-## __Amazon Elastic Kubernetes Service__
-  - ### Features
-    - Vended logs update param for capability vended logs feature
-
-## __Amazon Route 53 Global Resolver__
-  - ### Features
-    - Adds support for regions in the UpdateGlobalResolver input.
-
-## __Amazon SageMaker Service__
-  - ### Features
-    - Add InstancePools support to Endpoint for flexible provisioning across a prioritized list of instance types. Add Specifications support to InferenceComponent for per-instance-type model configurations.
-
-## __CloudWatch Observability Admin Service__
-  - ### Features
-    - Observability Admin enablement launch for AWS Kafka, Bedrock Agent Core Workload Identity and OTel metric enablement.
-
-## __Managed Streaming for Kafka__
-  - ### Features
-    - Adds support for ZookeeperAccess field to control the Client-Zookeeper connectivity.
-
-## __Payment Cryptography Control Plane__
-  - ### Features
-    - Adds support for resource-based policies on AWS Payment Cryptography keys, enabling cross-account key sharing. Also adds Multi-Party Approval (MPA) team association APIs for protecting sensitive import root public key operations.
-
-## __Url Connection Client__
-  - ### Bugfixes
-    - Allow retry when URL Connection HTTP Client encounters a NullPointerException wrapped in a RuntimeException
-
-# __2.43.1__ __2026-04-29__
-## __AWS Account__
-  - ### Features
-    - Adds AccountState in the response for the GetAccountInformation API. Each state represents a specific phase in the account lifecycle. Use this information to manage account access, automate workflows, or trigger actions based on account state changes.
-
-## __AWS Elemental MediaPackage v2__
-  - ### Features
-    - This feature adds configuration for specifying SCTE marker handling and allow greater control over generated manifest and segment URIs
-
-## __AWS SDK for Java v2__
-  - ### Features
-    - Updated endpoint and partition metadata.
-
-  - ### Bugfixes
-    - Fixed deserialization failure for JSON responses containing field names longer than 50,000 characters. Services like DynamoDB allow attribute names up to 65,535 bytes, which exceeded Jackson's default `maxNameLength` limit.
-
-## __AWS Transfer Family__
-  - ### Features
-    - This launch will increase the limits for customers to list the contents from the remote directories from 10k to 200k.
-
-## __AWSDeadlineCloud__
-  - ### Features
-    - Adds support for rtx-pro-server-6000 GPU accelerator for service-managed fleets.
-
-## __Amazon Bedrock AgentCore__
-  - ### Features
-    - Adds batch evaluation for running evaluators against multiple agent sessions with server-side orchestration, AI-powered recommendations for optimizing system prompts and tool descriptions, and AB testing with controlled traffic splitting and statistical significance reporting
-
-## __Amazon Bedrock AgentCore Control__
-  - ### Features
-    - Adds configuration bundles for versioned, immutable agent configuration snapshots with branch-based lineage
-
-## __Amazon CloudFront__
-  - ### Features
-    - Amazon CloudFront now supports cache tag. Tag objects via response headers and invalidate all matching objects in a single request, replacing manual URL tracking and broad wildcards.
-
-## __Amazon Elastic Container Registry__
-  - ### Features
-    - Removes support for registry policy V1
-
-## __Amazon GameLift__
-  - ### Features
-    - Amazon GameLift Servers adds a new DescribeContainerGroupPortMappings API for container fleets, making it easy to discover which connection ports map to your container ports without needing to remotely access the compute.
-
-## __Amazon S3__
-  - ### Bugfixes
-    - Add custom 503 throttling detection for S3 head operations
-
-## __Amazon WorkSpaces Web__
-  - ### Features
-    - Allow admins to configure IPv6 ranges on IP Access Settings.
-
-## __S3 Transfer Manager__
-  - ### Bugfixes
-    - Fixed an issue where cancelling a directory transfer did not fully stop the operation.
-
-## __S3TransferManager__
-  - ### Features
-    - Support MRAP buckets in S3 TransferManager.
-
-# __2.43.0__ __2026-04-27__
-## __AWS Glue__
-  - ### Features
-    - Addition of AdditionalAuditContext to GetPartition, GetPartitions, GetTableVersion, and GetTableVersions
-
-## __AWS Key Management Service__
-  - ### Features
-    - KMS GetKeyLastUsage API provides information on the last successful cryptographic operation performed on KMS keys. This new API provides KMS customers with the last timestamp, CloudTrail eventId, and the cryptographic operation that was performed on the key.
-
-## __AWS SDK for Java v2__
-  - ### Features
-    - Add support for overriding authSchemeProvider per request.
-    - Optimize ExecutionAttributes to reduce resizes and reduce hash computation cost.
-
-## __AWSBillingConductor__
-  - ### Features
-    - Add support for Passthrough pricing plan
-
-## __Amazon CloudWatch Application Signals__
-  - ### Features
-    - Application Signals now supports creating composite Service Level Objectives on Service Operations. Users can now create service SLO on multiple operations.
-
-## __Amazon CloudWatch Logs__
-  - ### Features
-    - Adds support for selecting all logs sources and types in a single association.
-
-## __Amazon GameLift Streams__
-  - ### Features
-    - Adds Proton 10.0-4 to the list of runtime environment options available when creating an Amazon GameLift Streams application
-
-## __Amazon Interactive Video Service__
-  - ### Features
-    - Adds tags parameter to the CreateAdConfiguration operation
-
-## __Amazon Omics__
-  - ### Features
-    - Enable Public Internet or VPC configuration to BatchRun
-
-## __Amazon OpenSearch Service__
-  - ### Features
-    - Amazon OpenSearch Service now supports JWKS URL configuration for JWT authentication
-
-## __Amazon S3__
-  - ### Features
-    - Add configurable `expectContinueThresholdInBytes` to S3Configuration (default 1 MB). The Expect: 100-continue header is now only added to PutObject and UploadPart requests when the content-length meets or exceeds the threshold, reducing latency overhead for small uploads.
-
-## __Amazon SageMaker Service__
-  - ### Features
-    - Updated API documentation for endpoint MetricsConfig. Added details on supported metric publish frequencies and clarified how EnableEnhancedMetrics controls utilization and invocation metric behavior.
-
-## __Amazon WorkSpaces__
-  - ### Features
-    - Added support for Protocol as modified resource and added update failure as modification state
-
-## __Application Migration Service__
-  - ### Features
-    - Added network modernization support, enabling customers to edit, resize, merge, and split VPCs and subnets during migration while retaining functional, non-conflicting IP addresses.
-
-## __S3 Transfer Manager__
-  - ### Bugfixes
-    - Fix TransferListener callbacks (bytesTransferred, transferComplete) not firing for unknown-content-length uploads via S3TransferManager when the data fits in a single chunk.
-

.changes/2.43.2.json .changes/2.43.x/2.43.2.json.changes/2.43.2.json renamed to .changes/2.43.x/2.43.2.json

@@ -20,7 +20,7 @@
     <parent>
         <artifactId>archetypes</artifactId>
         <groupId>software.amazon.awssdk</groupId>
-        <version>2.43.3-SNAPSHOT</version>
+        <version>2.44.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

.changes/next-release/feature-AWSSDKforJavav2-new-retries-2026.json

@@ -20,7 +20,7 @@
     <parent>
         <artifactId>archetypes</artifactId>
         <groupId>software.amazon.awssdk</groupId>
-        <version>2.43.3-SNAPSHOT</version>
+        <version>2.44.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>archetype-lambda</artifactId>

CHANGELOG.md

@@ -20,7 +20,7 @@
     <parent>
         <artifactId>archetypes</artifactId>
         <groupId>software.amazon.awssdk</groupId>
-        <version>2.43.3-SNAPSHOT</version>
+        <version>2.44.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

archetypes/archetype-app-quickstart/pom.xml

@@ -20,7 +20,7 @@
     <parent>
         <artifactId>aws-sdk-java-pom</artifactId>
         <groupId>software.amazon.awssdk</groupId>
-        <version>2.43.3-SNAPSHOT</version>
+        <version>2.44.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>archetypes</artifactId>

archetypes/archetype-lambda/pom.xml

@@ -17,7 +17,7 @@
     <parent>
         <groupId>software.amazon.awssdk</groupId>
         <artifactId>aws-sdk-java-pom</artifactId>
-        <version>2.43.3-SNAPSHOT</version>
+        <version>2.44.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>aws-sdk-java</artifactId>