2.25.3 Server 2.14 Support

Core

• More schedule headers to match updated server implementation #1543
• Headers object toString bug #1545
• WebSocket masking used % 8 instead of % 4 — #1546
• NatsConnection fine tuning variable access #1547
• Flush Immediately After Publish Fix #1550
• Finds while building J3 #1554

JetStream

• Update api objects based on schema review #1549
• ObjectInfo getObjectName() should be marked @nonnull #1559
• 2.14 Stream Configuration #1561
• 2.14 Reset Consumer #1562
• Flow Control $JS.FC support #1563
• 2.14 Stream Consumer Source support #1565
• Reset Consumer Test Flapper #1567
• Reset Consumer correct API response and improve test #1568

Testing

• Fix test, server 2.12.5 allows update max consumers #1538

Miscellaneous

• Document use of ConsumerInfo management call #1539
• Add Readme index to Consumer Info Calls #1541
• Move examples to subproject #1544

CI/CD

• Setup claude to only manually trigger #1540
• Testing claude script v2 #1542
• Fix Claude workflow configuration #1551 @Jarema
• Change claude to always review #1569

New Nats Docs Examples

• Queue Group Doc Examples were switched #1553
• [New Nats Docs Examples] Complete Missing Examples #1556
• [New Nats Docs Examples] SubjectsSingleWildcard #1557
• [New Nats Docs Examples] Update Single and Multi Wildcard #1558
• [New Nats Docs Examples] Misc Examples Improvements #1560
• [New Nats Docs Examples] Improved Comment #1564
• [New Nats Docs Examples] Fix start marker #1566

2.25.2 Bug Fixes and Housekeeping

Core

• fix race condition in reconnect #1523 @scottf @jkraml-staffbase
• "Payload Size" includes header bytes, not just data #1525 @scottf @francoisprunier
• NatsConnection improvements: reader and writer replace, options executors use #1526 @scottf
• HostnameResolveMode better organizes the 4 possible modes #1536 @scottf @bartosz822

JetStream

• Simplification track user processed not client received. #1528 @scottf
• New Examples for Priority Groups #1529 @roeschter
• StreamInfo fix active to handle -1 and not supplied correctly #1531 @scottf

Testing

• SSL Error Raising Testing #1532 @scottf
• Cleanup temp files and folders in tests #1534 @scottf

Miscellaneous

• Updating Badges #1521 @scottf
• Housekeeping #1535 @scottf

2.25.1 Options Additions and Message Queue Improvements

Core

• Fix setting options via properties #1489 @scottf
• Lazy initialize Options executors #1492 @scottf
• Adding flexibility for executor options #1493 @scottf
• [bug] Properly count message/bytes when in discardWhenFull mode #1498 @scottf
• Subject validation #1501 @scottf
• Call to error listener should have been done in a callback, not directly #1502 @scottf
• Message Queue Splitting #1505 @scottf
• NatsConnectionReader better ReadListener call #1507 @scottf
• NatsConnectionReader better exceptions #1509 @scottf
• Enable path component when connecting via WebSocket #1514 @jbaeck
• Faster JsonValue equals and hashcode #1517 @scottf

Object Store

• Object Store purge on re-put #1491 @scottf

Miscellaneous

• Documenting Uber Jar and fixing example class usages. #1496 @scottf
• Fix Flapper Test testSocketDataPortTimeout #1500 @scottf
• Subject validation readme and backfill #1503 @scottf
• Doc examples #1508 @scottf
• Fix line ends #1511 @scottf
• Doc examples #1513 @scottf

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