2.24.1 Minor and Automatic-Module-Name

Build

• Fix removed Automatic-Module-Name #1486 @scottf @derklaro

Core

• Properly unsubscribe from dispatcher subject #1483 @scottf
• Internal Options Executor Awareness #1484 @scottf

2.24.0

Core

• [BUG] Properly return pending bytes #1437 @scottf
• Improve ConnectionListener #1438 @scottf
• Server Pool Improvement #1443 @scottf
• Improved reconnect determining when to switch queues #1444 @scottf
• Improve output queue push locking and error message #1446 @scottf
• ConnectionListener event time #1448 @scottf
• Optimize header reading #1449 @scottf
• Header fine tuning #1451 @scottf
• Header tuning don't over engineer #1453 @scottf
• Micro-optimization getBytes(ISO_8859_1) vs getBytes(US_ASCII) #1455 @scottf
• Reduce calls to stats by combining. #1465 @scottf
• [BUG] MessageQueue drainTo was not properly copying length and size. #1468 @scottf
• MessageQueue drainTo more #1469 @scottf
• Auth Error is allowed to be set before being connected #1475 @scottf

JetStream

• Stream Config Persist mode #1436 @scottf
• Review methods with varargs for proper validation #1456 @scottf
• [BUG] AccountTier read reserved values as int instead of long #1457 @scottf
• Handle both wrong last sequence 10071 / 10164 #1463 @scottf
• Pinned Consumer Support #1472 @scottf

Docs

• Fixed the Typo in the Example Code #1450 @sikandar

Test

• Refactor test to validate issue 1426 #1447 @scottf
• Additional test coverage #1452 @scottf
• Demonstrate Pull Status Warning Handling #1454 @scottf
• Miscellaneous Test Coverage #1460 @scottf
• Fix and Enable ReconnectTests testForceReconnectQueueBehaviorCheck #1473 @scottf
• Javadoc Technical Debt #1476 @scottf

Build

• Build modifications for Coveralls #1459 @scottf

2.23.0 Server 2.12 Support and Core Socket Customizations

Server 2.12 Specific

• (2.12) All 2.12 PRs combined #1403* @scottf
  • (2.12) ClusterInfo field updates #1408 @scottf
  • (2.12) Support Stream Config allow_msg_schedules #1422 @scottf
  • (2.12) Message Counter support #1423 @scottf
  • (2.12) Support Batch Publish #1425 @scottf
  • (2.12) Prioritized Consumer Support #1433 @scottf

Core

• Make NatsStatistics public so it can be extended #1414 @scottf
• Statistics classes improvements #1415 @scottf
• Lock around access to pending message and byte counts #1416 @scottf
• Socket Read Timeout remove validation #1417 @scottf
• Ensure write timeout is not less than 100 nanoseconds #1429 @scottf
• Options to set underlying socket configuration of SO_SNDBUF and SO_RCVBUF #1432 @scottf

JetStream

• Exposed StreamName #1431 @roeschter

Misc

• Add getter for ObjectMeta Metadata to ObjectInfo #1418 @scottf
• Update SocketDataPortBlockSimulator #1430 @scottf

2.22.0 Fixes and catch-up

Core

• Expose connection outgoingPendingMessageCount and outgoingPendingBytes #1412 @scottf

JetStream

• Add publish header "Nats-Expected-Last-Subject-Sequence-Subject" #1401 @scottf
• Add publish header "Nats-Expected-Last-Subject-Sequence-Subject" part b. #1402 @scottf
• [Fix] Reset cached consumer info when re-making ordered consumers #1405 @scottf
• consumers - metadata comparison #1410 @scottf

ObjectStore

• ObjectMeta metadata #1399 @scottf

Misc

• Clarify documentation for JetStreamSubscription #1400 @davidmorley
• Build (CI/CD) Stuff #1404 @scottf
• Update version of bouncycastle to resolve CVE-2025-9341 #1406 @vkolomeyko

2.21.5

Core

• Implement Fast fallback algorithm in SocketDataPort #1351 @jitinsharma
• [FIX] Shutdown internal executors on connection close. #1357 @scottf
• Convert serverAuthErrors to ConcurrentHashMap #1359 @scottf
• Fix SSL handshake listeners never removed, preventing garbage collection #1360 @scottf
• Fix core unsubscribe by subject #1363 @scottf
• Move from JetBrains nullability annotations to JSpecify #1366
• Fix timeout computing to address possible nano time overflow #1375 @scottf @magicprinc
• Create NatsInetAddress to allow replacement of InetAddress #1378 @scottf @jitinsharma
• Json parser tuning. #1382 @scottf
• Connection and adjacent objects nullability markers. #1383 @scottf
• Headers +toString(), fixes #1385 @magicprinc
• Header nullability #1395 @scottf
• Updated SSL Files and Build preparing for server 2.12 #1397 @scottf

JetStream

• [Fix] Simplified Ordered Consumer - Getting name early can cause NPE #1354 @scottf
• Stream Name cannot be null #1377 @scottf
• Fix JetStreamApiException constructor nullability conflict #1379 @scottf
• Ensuring nullability contracts #1387 @scottf

Key Value

• Add revision guard on KV key "create" #1356 @scottf
• Fixed limit marker test for server change #1367 @scottf
• Additional KV Marker / TTL testing #1391 @scottf

Testing / Examples / Docs / Etc

• Ordered Consumer Examples #1352 @scottf
• Update readme for fast fallback option #1353 @jitinsharma
• Improved Consumer Name Testing #1365 @scottf
• Review for Issues (#1361 and #1362) #1368 @scottf
• Unit test refactor #1369
• Use String.replace instead of String.replaceAll #1381 @scottf @magicprinc
• Fixed Jacoco from considering test classes #1390 @scottf
• Fixing flapping tests #1393 @scottf
• Fix test flappers #1396 @scottf

2.21.4 Features and Fixes

Core

• Fix race condition during reconnect sends UNSUB messages #1321 @ajax-surovskyi-y
• Add connection auth token supplier option #1324 @buleuszmatak
• Nano time for elapsed timings and Nats System Clock #1334 @scottf
• Replace Timer with scheduled tasks #1335 @scottf
• [Bug] Fix UNSUBs after disconnect can cause auth violations #1336 @scottf @ajax-surovskyi-y
• Options allow token supplier from property, not just api method #1349 @scottf

JetStream

• Annotating API objects with NotNull and Nullable #1333 @scottf
• [Bug] MessageConsumer.isFinished() not set properly in certain conditions #1339 @scottf
• [Bug] Pull Heartbeat handler intermittent failure after switch to scheduler #1345 @scottf
• Fix heartbeat timer handling broken when replacing timer with scheduler. #1348 @scottf

Key Value

• Nats-Marker-Reason must be mapped to a Key Value Operation #1323 @scottf
• KV Purge Per Message TTL #1344 @scottf

Tests

• Addition validation and test for token / token supplier #1325 @scottf
• Add test for auth violations during reconnect #1328 @ajax-surovskyi-y
• Fixed KV Limit Marker Test to only run against 2.11.2 or later #1338 @scottf
• Fix flapping test: testOverflowFetch #1340 @scottf
• Set the test timeout default to 3 minutes. #1343 @scottf

Misc

• Better Json Print Formatter #1327 @scottf

2.21.3 DO NOT USE. REPLACED BY 2.21.4

DO NOT USE. REPLACED BY 2.21.4

2.21.2 Bug Fixes and JetStream and KeyValue Improvements

Core

• Changed header value validation to accept any ascii except CR & LF #1316 @francoisprunier

JetStream

• Update account ApiStats with level and inflight #1304 @scottf
• Update account AccountTier with reserved memory and reserved storage #1305 @scottf
• Add StreamAlternate structure to StreamInfo response #1306 @scottf
• Better workflow for leadership change while pull consuming. #1313 @scottf
• Ability to supply a prefix for watches. Fixed ordered consumer naming bug. #1314 @scottf
• Use full NUID for generated consumer names #1317 @scottf

Key Value

• Update KV consumeKeys() to return the BlockingQueue immediately. #1308 @scottf
• KV Limit Marker #1310 @scottf
• KV LimitMarker add missing getter, additional docs and tests #1311 @scottf

General

• Update repository info and cleanup readme. #1318 @scottf