4.0.0-java -- 2026-04-29

⚠ BREAKING CHANGES

• java: The embedded legacy DynamoDB Encryption Client (DDBEC) now uses AWS SDK for Java 2.x and no longer supports AWS SDK for Java 1.x (#2048).

  Who is affected: Java customers migrating from legacy DDBEC who use the com.amazonaws.services.dynamodbv2.datamodeling namespace. If your code calls DDBEC APIs from com.amazonaws.services.dynamodbv2.datamodeling, you must migrate to the equivalent APIs under com.amazonaws.services.dynamodbv2.datamodeling.sdkv2.

  Who is not affected: Customers not using the com.amazonaws.services.dynamodbv2.datamodeling namespace. The rest of DB-ESDK is unchanged.

Features -- Java

• java: add DDBEC with SDK v2 and remove DDBEC with SDK V1 (#2048) (035dbe3)

Fixes -- All Languages

• use UUIDs and cleanup in beacon styles example to avoid stale item collisions (#2125) (773c1ff)

Fixes -- Java

• java: drop hkdf offset method (#2011) (b8f29f9)

Maintenance -- All Languages

• dafny: bump MPL and update mutable map (#1974) (e9ea870)
• dafny: bump smithy dafny (#1971) (85309a0)

Maintenance -- Java

• java: Allow local testing (#1947) (bf5a106)
• java: Attempt to reduce flaky CI (#2220) (987aec6)
• java: attempt to reduce flaky CI failures (#2203) (b4d88f1)
• java: bring back test against released MPL version (#2226) (a340b34)
• java: fix GetEncryptedDataKeyDescription java Example (#1973) (ba8fcb7)
• java: retry failed workflow (#2229) (2668d68)
• java: shut down local DDB in test (#2176) (fa1e151)