Spring Boot 2.3.3 Released with JDK 15 Support, New Features and 67 Bugfixes
Spring Boot 2.3.3 has been released, offering initial support for JDK 15, a Maven parent pom snippet, 67 bug fixes and enhancements—including HTTP/2 improvements, configuration fixes, and numerous dependency upgrades—along with updated documentation and a link to the full release notes.
Spring Boot 2.3.3 stable version is now available and can be obtained from repo.spring.io or Maven Central.
The release includes a total of 67 bug fixes, feature enhancements, documentation improvements, and dependency upgrades.
New Features
Applying HTTP/2 in Spring Boot no longer requires a forced Jetty and Conscrypt binding (issue #22188).
Bugfixes
Fixed externalized configuration ignoring null values in SPRING_APPLICATION_JSON (issue #22895).
Fixed migration issues for legacy endpoint IDs containing a hyphen (issue #22849).
Ensured that the cause of Reactor debug agent initialization failures is no longer discarded (issue #22847).
Resolved OCI image build failures when the environment contains empty properties (issue #22703).
Fixed LiquibaseEndpoint not reporting changesets from ancestor contexts (issue #22686).
Corrected 404 responses caused by requests that should be handled by another DispatcherServlet (issue #22682).
Addressed asynchronous exception handling failures for pages deployed as WAR (issue #22672).
Fixed incompatibility of XADataSourceAutoConfiguration with DB2XADataSource due to missing URL property (issue #22641).
Adjusted TaskExecutorBuilder to use second‑level precision when configuring shutdown wait periods (issue #22611).
Resolved the problem where setting ignoreInvalidFields=true on @ConfigurationProperties caused unknown fields to be ignored (issue #22585).
Ensured a new application context is created for each integration test class when using @SpyBean (issue #22583).
Fixed silent removal of Kotlin detection warnings in Jackson2ObjectMapperBuilder during backend pre‑initialization (issue #22580).
Corrected UndertowWebServerFactoryCustomizer to support UndertowOptions instead of only Options (issue #22578).
Ensured WebMvcTest and WebFluxTest import the necessary Jackson module beans (issue #22576).
Allowed CouchbaseCacheManager to be customized via CacheManagerCustomizer (issue #22573).
Fixed Kubernetes readiness probe endpoint returning 404 (issue #22562).
Corrected ordering issues in CouchbaseCacheConfiguration (issue #22542).
Resolved a Mustache environment collector failure when using the nullValue compiler option in 2.3.1 (issue #22039).
In addition, many dependencies have been upgraded and the documentation has been improved. For full details, see the official release page:
https://github.com/spring-projects/spring-boot/releases/tag/v2.3.3.RELEASE
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