Major Releases

[#3105] Revise Snapshotting logic

[#3105] Reintroduce Snapshotting by @hjohn in #4204

[#3105] Set AxonServerSnapshotStore in the AxonServerConfigurationEnhancer by @smcvb in #4307

Snapshotting rework to allow snapshots to be part of event stream by @hjohn in #4335

[#3514] First-class Spring support for AxonTestFixture

feat(extensions): init axon-spring-boot-starter-test with AxonTestFixture bean support by @MateuszNaKodach in #4213

[#3618] Last-minute Message#payload conversion

[#3618] Introduce conversion awareness to the GenericMessage by @hatzlj in #4312

[#3618] Make lastminute/inline payload conversion available for command handling by @hatzlj in #4314

[#3618] Make lastminute/inline payload conversion available for event handling by @hatzlj in #4313

[#3618] Make lastminute/inline payload conversion available for query handling by @hatzlj in #4315

[#3879] Provide Kotlin extension for 5.0

[#3879] Introduce Kotlin extension by @jangalinski in #4432

[#3886] Support Spring Data Page through the JacksonConverter

[#3886] Add Jackson module for Spring Data Page deserialization by @theoema in #3937

[#3891] Introduce @Namespace annotation and use for Event Processor naming

[#3891] Introduce and use the @Namespace annotation by @smcvb in #4226

[#3923] Filter events while streaming with given EventCriteria for aggregate-based storage solutions

[#3923] Filter events while streaming with given EventCriteria for aggregate-based storage solutions by @hjohn in #4005

[#4111] Enable decorator pattern for EventProcessors (register as interface type)

[#4111] Register event processors as interface types for decorator support by @theoema in #4113

[#4182] Reintroduce JdbcAutoConfiguration

[#4384] Introduce configuration section functionality

[#4384] feat: introduce extensible configuration + adjust DLQ to use the approach by @MateuszNaKodach in #4385

Introduce ReplayStatusChangedHandler by @smcvb in #4297

Port Reactor Extension to Axon Framework 5 by @theoema in #4245

Introduce dedicated examples for Spring Boot 3 and 4 by @hatzlj in #4367

feat(integrationtests): base AbstractIntegrationTest class decoupled from Axon Server by @MateuszNaKodach in #4413

[#3149] Allow queries with a local handler to shortcut to the local segment

[#3194] DbScheduler 15+ incompatible with Axon Framework 4.10.2

[#3304] Integrate event replay logic into Event Handling Component

[#3304] Support resets for the PooledStreamingEventProcessor resulting in EventHandlingComponent replays by @MateuszNaKodach in #3957

[#3304] Deserialize ReplayToken#context with the Converter by @MateuszNaKodach in #3979

[#3577] Modules should inherit ConfigurationEnhancer settings from the parent

[#3577] Module registry inheritance by @zambrovski in #4090

[#3816] Adopt JSpecify nullability annotations

[#3816] Adopt JSpecify nullability annotations by @jangalinski in #4233

[#3816] Adopt JSpecify nullability annotations - Nullmarked by @jangalinski in #4251

[#3952] Transactional resources should be managed by resource executors as part of the processing context

[#3962] Validate necessity of SpringLazyCreatingModule

[#3962] LazyInitializedModule is still required, but can be slightly improved by @zambrovski in #4033

[#3998] Allow SimpleUnitOfWorkFactory to augment its work units with enhancers

Allow SimpleUnitOfWorkFactory to augment its work units with enhancers by @hjohn in #3999

Show failed message handler in logs by @Sam-Kruglov in #3913

Default to the AnnotationMessageTypeResolver in annotation-specific components by @Sam-Kruglov in #3894

Refactor JPA Spring Boot auto configuration and slight SpringComponentRegistry tweak by @Sam-Kruglov in #3892

Some codestyle improvements by @abuijze in #3951

Event Storage Engine Test Suite improvements - Add stream-sees-appended-events tests and make methods protected by @hjohn in #3956

feat(test-fixture): AxonTestThenCommand - resultMessagePayload - convert payload before executing the check by @MateuszNaKodach in #3995

Introduce ArchUnit into commons module by @hjohn in #4015

Add new integration test using event store and unit of work by @hjohn in #4014

[#3517] feat(eventhandling): PooledStreamingEventProcessor - introduce SegmentChangeListener by @MateuszNaKodach in #4183

EntityManagerTransactionManager - supports JPA transactions without Spring by @MateuszNaKodach in #4232

EventProcessors - enforce explicitly named event components by @MateuszNaKodach in #4265

Make Property#get method return nullable value by @jangalinski in #4358

Enhancement/university java springboot3 setup by @hatzlj in #4374

Refactor AbstractMessageStream and implementations by @hjohn in #4396

Replace AxonTestFixture setting axonServerEnabled for integrationEnabled by @smcvb in #4445

Replace AxonIQ references with Axoniq by @MateuszNaKodach in #4471

Provide default ResetHandler#handle(ResetContext, ProcessingContext) for EventHandlingComponent by @smcvb in #4350

Fix javadocs / warnings in EventSourcing module by @hjohn in #4360

Fix warnings in messaging by @hjohn in #4368

Add test case for appending multiple events with append condition set by @hjohn in #4478

fix(test): disable PostgresqlConfigurationEnhancer in AxonTestFixture to prevent using Postgres db in non-integration tests by @MateuszNaKodach in #4480

Remove unused imports by @jangalinski in #4235

Update copyright notice for 2026 by @jangalinski in #4066

[#3784] Polymorphic @EventSourcedEntity - doesn’t evolve immutable entities

[#3784] Support Polymorphic Sealed Interface Entity Evolution by @hatzlj in #3975

[#3853] Setting a callback on a MessageStream which throws an error during callback should result in the stream completing with that error

[#3853] Fix exceptions on callback should report error and close MessageStream by @jangalinski in #4072

[#3855] When a sourcing completes, the callback should be called per MessageStream contract

[#3855] Re-Enable callback test on AggregateBasedStorageEngineTestSuite by @jangalinski in #4352

Make initial callback execution for InMemory engine unconditional by @hjohn in #4176

[#3982] fix(test): Event events(@Nonnull List<?>…​ events) - invalid usage of varargs by @MateuszNaKodach in #3984

Fix toString in GenericEventMessage by @hjohn in #4000

[#4006] AggregateBasedJpaEventStorageEngine should return the max (or latest) token when tokenAt is called with a date in the future

Feature/fix token at future date by @hjohn in #4007

[#4012] Resolve MessageType for query handlers based on MessageTypeResolver

Resolve MessageType for query handlers based on MessageTypeResolver by @CodeDrivenMitch in #4012

[#4200] DefaultEventStoreTransaction can under some circumstances return a sourced stream without filtering the consistency marker

[#4203] When snapshot loading fails (for any reason), fallback to normal loading

[#4220] When using EventStore::publish with multiple events, no processing context, and with the default interceptor, events can be published in different order

[#4288] Fix token advancement in AggregateBasedJpaEventStorageEngine by @markuseckstein in #4290

[#4339] AF 5.1.0-RC1 regression: JpaTransactionAutoConfiguration and JdbcTransactionAutoConfiguration break on Spring Boot 4 due to hard class references

[#4339] fix(extensions/spring-boot): Spring Boot 4.x support - use afterName in AutoConfiguration classes by @MateuszNaKodach in #4344

[#4340] AF 5.1.0-RC1 regression: circular dependency BoundConfigurationProperties / AxonServerConfiguration on Spring Boot 4

[#4340] Break cyclic dependencies in spring autoconfiguration by @hatzlj in #4354

[#4340] fix(extensions/spring-boot): defer SpringComponentRegistry initialization for infrastructure beans to prevent BoundConfigurationProperties cycle by @MateuszNaKodach in #4365

fix(messaging): prevent StackOverflowError from double LocalConfiguration in module parent chain by @MateuszNaKodach in #4351

[#4355] ConcatenatingMessageStream should ensure it interacts with its first stream before calling isCompleted as this flag may otherwise be out of date

[#4355] ConcatenatingMessageStream ensures it interacts with its first stream before calling isCompleted by @hjohn in #4357

[#4356] QueueMessageStream should only return true for isCompleted when actually completed

[#4366] JpaPollingEventCoordinator daemon thread races against EntityManagerFactory.close() during Spring context shutdown

Wait for polling thread to terminate for JPA event storage engine by @hjohn in #4372

[#4377] Remove hard dependency on Jackson 3 from autoconfigured JpaTokenStore and JdbcTokenStore

Bug/4377/tokenstore autoconfig jackson3 dependency by @hatzlj in #4380

[#4392] Event Processors Spring Boot properties are not applied

[#4392] fix(messaging): consistent EventProcessor module naming by @MateuszNaKodach in #4393

fix(extensions/spring-boot): do not ignore @Namespace annotation on @Component with @EventHandler annotations if the matching EventProcessorDefinition is not present by @MateuszNaKodach in #4369

test(messaging): fix command-threads property test using wrong prefix and weak assertion by @MateuszNaKodach in #4381

Fix test isolation for the ReplayStatusChangedHandlerIT by @hatzlj in #4321

[#4427] Re-enable Examples build

[#4427] Re-enable Examples build by @jangalinski in #4447

[#4437] Fix consistency marker when sourcing an empty stream in the AggregateBasedJpaEventStorageEngine by @hatzlj in #4454

[#4455] NullPointerException in AbstractMessageStream.next() - FetchResult.Value(@Nullable) + Optional.of() crash PooledStreamingEventProcessors

[#4455] Support a null MessageStream.Entry on the AbstractMessageStream.FetchResult by @smcvb in #4457

[#4450] Order JdbcAutoConfiguration correctly for Datasource by @smcvb in #4451

Ensure UnitOfWork recorded cause on runErrorHandlers is set by @hjohn in #4435

Fix flakey test in AbstractSubscriptionQueryTestSuite by @hjohn in #4433

Possible fix for CI flakyness problem by @hjohn in #4481

Reintroduce Getting Started AI-specific files by @smcvb in #4268

[#3311] Construct a migration guide for Axon Framework 5

[#3961] Rework Documentation to align with AF5 API

[#3961] Rework Documentation to align with AF5 API by @smcvb in #4074

[#4030] Add documentation explaining application startup event

Add documentation explaining application startup event by @corradom in #4284

[#4059] Explain use of @EventTag annotation in event-dispatchers.adoc

[#4059] Reference DCB/EventTag in for event dispatchers by @jangalinski in #4064

[#4092] Migration path - Configuration and Configurer Modules in AF5

[#4092] Introduce Configuration migration path by @smcvb in #4353

[#4095] Rewrite Tuning section to comply with AF5 API

[#4325] Migration path - Snapshotting

[#4414] Add note on Converter/Serializer Documentation

Updated documentation for dispatching of Commands, Events and Queries by @abuijze in #3939

Documentation for command handlers by @abuijze in #3946

Migrated documentation for query handlers by @abuijze in #3963

Migrated messaging concepts section to Axon 5 style by @abuijze in #3967

Migrated event handling documentation by @abuijze in #3974

docs: update modules structure and platform branding by @abuijze in #3960

Doc/doc migration conversion by @abuijze in #3954

Rewrote documentation about test fixtures by @abuijze in #3991

Fix documentation for EventStoreTransaction methods by @hjohn in #3983

docs(af5-getting-started): Update Axon Framework version to 5.0.1 by @MateuszNaKodach in #3987

docs(messaging): clarify that @Timestamp annotation is required to inject event timestamp in @EventHandler and @EventSourcingHandler annotations by @MateuszNaKodach in #4106

[#3517] docs(reference-guide): update DLQ docs for Axon Framework 5 by @MateuszNaKodach in #4292

Introduce the base migration guide by @smcvb in #4075

Mark documentation as pre-release for development branch by @smcvb in #4103

[#3105] Add snapshot documentation by @hjohn in #4298

Add reference documentation for inline message payload conversion by @hatzlj in #4316

Improvements for queries documentation in the reference guide by @hatzlj in #4322

Improve Javadoc on QueryUpdateEmitter by @hatzlj in #4327

Doc typo - refer to Event schedulers instead of Deadlines by @smcvb in #4310

Add missing author and since tags by @hjohn in #4371

Add a module overview diagram to the Axon Framework Documentation by @hatzlj in #4386

Color-code the module overview in the reference by @hatzlj in #4387

Repository Transfer notice by @smcvb in #4415

Remove image link about AxonIQ Console by @smcvb in #4421

@abuijze

@CodeDrivenMitch

@corradom

@dilgerma

@hatzlj

@hjohn

@jangalinski

@Kirboyyy

@markuseckstein

@masaha03

@MateuszNaKodach

@Sam-Kruglov

@smcvb

@stefanmirkovic

@theoema

@vcanuel

@zambrovski

@abuijze

@CodeDrivenMitch

@gklijs

@hjohn

@jangalinski

@m1l4n54v1c

@MateuszNaKodach

@nordicthings

@mnegacz

@rubenahrens

@saratry

@smcvb

@TeraSeo

@trimoq

@zambrovski