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Upgrading to Spring Framework 6.x
This page provides guidance on upgrading to Spring Framework 6.0.
The JSR-330 based @Inject annotation is to be found in jakarta.inject now. The corresponding JSR-250 based
annotations @PostConstruct and @PreDestroy are to be found in jakarta.annotation. For the time being,
Spring keeps detecting their javax equivalents as well, covering common use in pre-compiled binaries.
ListenableFuture has been deprecated in favor of CompletableFuture.
See 27780.
Due to the Jakarta EE migration, make sure to upgrade to Hibernate ORM 5.6.x with the hibernate-core-jakarta
artifact, alongside switching your javax.persistence imports to jakarta.persistence. The corresponding
Hibernate Validator generation is 7.0.x, based on jakarta.validation.
Due to the Jakarta EE migration, make sure to upgrade to Tomcat 10, Jetty 11, or Undertow 2.2.14 with the
undertow-servlet-jakarta artifact, alongside switching your javax.servlet imports to jakarta.servlet.
Several outdated Servlet-based integrations have been dropped: e.g. Commons FileUpload and Tiles, as well
as FreeMarker JSP support. We recommend StandardServletMultipartResolver for multipart file uploads
and regular FreeMarker template views if needed, and a general focus on REST-oriented web architectures.
Spring MVC and Spring WebFlux no longer detect controllers based solely on a type-level @RequestMapping
annotation. That means interfaced based AOP proxying for web controllers may no longer work. Please,
enable class based proxying for such controllers or otherwise the interface must also have @Controller,
see 22154.
HttpMethod is a class and no longer an enum. Though the public API has been maintained, some
migration might be necessary (i.e. change from EnumSet<HttpMethod> to Set<HttpMethod>, use if else instead of switch). For the rationale behind this decision, see
27697.
The Kotlin extension function to WebTestClient.ResponseSpec::expectBody now returns the Java BodySpec
type, and no longer uses the workaround type KotlinBodySpec.Spring 6.0 uses Kotlin 1.6, which fixed the
bug that needed this workaround (KT-5464).
This means that consumeWith is not longer available.
RestTemplate, or rather the HttpComponentsClientHttpRequestFactory, now requires Apache HttpClient 5.