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Upgrading to Spring Framework 5.x
This page provides guidance on upgrading to Spring Framework 5.0, 5.1, 5.2, and 5.3. See also the Spring-Framework-5-FAQ and What's New in Spring Framework 5.x.
Note that Spring Framework 4.3.x and therefore Spring Framework 4 overall reaches its EOL cut-off on December 31st, 2020, along with the 5.0.x and 5.1.x lines. Please upgrade to Spring Framework 5.2.x at your earliest convenience!
For Kotlin:
- Kotlin support has been upgraded to Kotlin 1.4 and is still compatible with Kotlin 1.3+.
- Kotlin Coroutines 1.4 (which builds on Kotlin 1.4) or above is now required for coroutines support.
- For Kotlin scripting, Kotlin 1.4 users should declare the
kotlin-scripting-jsr223dependency instead ofkotlin-scripting-jsr223-embeddable.
Hibernate support has been upgraded to a Hibernate ORM 5.2+ baseline, with a focus on ORM 5.4.x. Please note that Hibernate Search needs to be upgraded to 5.11.6 for Spring Framework 5.3 JPA compatibility; see Hibernate JIRA.
Jackson support covers Jackson 2.9 to 2.12 now, generally with the latest releases in each branch.
Groovy 3.0 is the officially supported version now, with Groovy 2.x support getting phased out.
Support for RxJava 1.x is deprecated; RxJava 2.x is the new baseline and 3.x is now supported.
JCA CCI support is deprecated, in favor of specific data access APIs (or native CCI usage if there is no alternative).
Several remoting technologies have been deprecated with no direct replacement (Hessian, RMI, HTTP Invoker, JMS Invoker).
MimeMessageHelper has been aligned with JavaMail 1.5+, not explicitly encoding attachment filenames by default anymore.
The properties-based bean definition format and all support classes based on it (such as PropertiesBeanDefinitionReader, JdbcBeanDefinitionReader and ResourceBundleViewResolver) are deprecated now, in favor of Spring's common bean definition formats and/or custom reader implementations.
InstantiationAwareBeanPostProcessorAdapter is deprecated now, in favor of the existing default methods in (Smart)InstantiationAwareBeanPostProcessor.
BeanNameAutoProxyCreator now honors the configured beanNames list when applying a custom TargetSourceCreator. Consequently, a BeanNameAutoProxyCreator no longer proxies beans whose names do not match the configured beanNames list. See gh-24915.
@EventListener methods use an implicit order value of Ordered.LOWEST_PRECEDENCE now, in alignment with transaction synchronizations and @TransactionalEventListener methods. If custom ordering is needed, please consistently declare @Order values on all listener methods.
Several JdbcTemplate signatures with Object[] arguments are deprecated, in favor of their existing varargs equivalents.
HibernateJpaVendorAdapter exposes Session(Factory) as EntityManager(Factory) extension interface by default (following Hibernate ORM 5.2+).
Reactive transactions consistently roll back on a Reactive Streams cancel signal now, preventing partial commits for common datastore transactions.
CORS configuration where allowCredentials is set to true now requires an explicit declaration of specific domains to allow via allowedOrigins or use of the newly added allowedOriginPatterns.
When using the PathPatternParser for request mapping, patterns with double-wildards in the middle of the pattern, such as "/path/**/other", are now rejected. This parser is used by default in WebFlux applications and can be used as an opt-in for MVC applications as of Spring Framework 5.3. See gh-24952.
The ForwardedHeaderFilter (Servlet) and ForwardedHeaderTransformer (WebFlux) have been enhanced and now support multiple values in X-Forwarded-Prefix and the new X-Forwarded-For / Forwarded: for= HTTP request headers. See gh-25254 and gh-23582.
@ExceptionHandler methods now check all exception causes when looking for a match. Previously, going back to 4.3 only the first cause was checked.
Handler method arguments with a conversion-based type such as UUID, Long, and others detect a null conversion result now, treating it as a missing value. In order to allow an empty String to be injected as a null argument, either set required=false on the argument annotation, e.g. @RequestHeader(required=false) or declared the argument as @Nullable.
WebSocketConfigurationSupport and WebSocketMessageBrokerConfigurationSupport have been refactored to not require CGLIB proxies, see related commit.
LocaleResolver, ThemeResolver, FlashMapManager and RequestToViewNameTranslator beans are now declared at WebMvcConfigurationSupport level with @Bean annotations for improved consistency with other Spring MVC default beans and to improve GraalVM compatibility by reducing reflection done otherwise in DispatcherServlet. Spring Boot or XML application context based projects shouldn't be impacted, but non Spring Boot projects using Javaconfig overriding one of those default beans may require an update since the bean declaration should now happen in the configuration class annotated with @EnableWebMvc (still using their well-known names), for example for the LocaleResolver:
@EnableWebMvc
@Configuration
public class WebConfig {
@Bean
public LocaleResolver localeResolver() {
return new FixedLocaleResolver(new Locale("fr", "FR"));
}
}
@RequestParam and @RequestPart enforce at least one element in a MultipartFile and Servlet Part collection/array when the argument is required (i.e. not explicitly marked as optional), consistent with individual MultipartFile/Part declarations, resolving the argument to null otherwise.
Spring MVC no longer performs .* suffix pattern matching by default, and likewise path extensions are no longer used by default to interpret the requested content type (e.g. /person.pdf, /person.xml, etc). Please, see the "Suffix Match" section of the reference documentation.
In case of JSON serialization errors while writing to the HTTP response, the JSON HttpMessageConverter will still flush to the response and clean up resources. If you were previously relying on the response not being written to, note that this was not an intended behavior and that we can't guarantee error handling for this case. See gh-26246 for an example of that.
@RequestPart with List<T> now converts the 1st part to List<T> consistent with Spring MVC and with how it works for T[]. Previously each part was converted to T, see gh-22973.
@EnableWebFlux now includes a declaration of a WebSocketHandlerAdapter bean. It should not interfere with any declared by the application due to a lower priority but if you have one, you can remove it.
WebClient now wraps emitted exceptions in either a WebClientRequestException, or a WebClientResponseException. CodecExceptions are not wrapped and still propagated. as before. See gh-23842.
A UriComponentsBuilder argument injected into an @Controller method is now application relative (i.e. it includes the contextPath) where previously it contained no path at all.
org.synchronoss.cloud:nio-multipart-parser is no longer a required dependency for multipart support in WebFlux. Instead, there is now the DefaultPartHttpMessageReader with no dependencies, see gh-21659
The Spring TestContext Framework now provides first-class support for inheriting and overriding test-related annotations from enclosing classes. This improves the programming model for using JUnit Jupiter @Nested test classes with Spring's testing support. Note, however, that annotations from enclosing classes will now be inherited by default. This is a change in behavior that may cause some of your @Nested test classes to fail after upgrading to Spring Framework 5.3. To revert to the behavior present in Spring Framework 5.0 - 5.2.x, you can annotate top-level, enclosing classes for your @Nested test classes with @NestedTestConfiguration(OVERRIDE). To switch to OVERRIDE mode for an entire project, you can configure spring.test.enclosing.configuration=override via a JVM system property or an entry in a spring.properties file in the root of the classpath (for example, in src/test/resources/spring.properties).
Consult the Javadoc for @NestedTestConfiguration and the reference manual for details.
Users of MockMvc Kotlin DSL could experience some breakages when using property syntax like isOk, isOk() should be used instead. There maybe be some other slight variations due to the improved Kotlin DSL, see this commit for more details.
Spring Framework 5.2 now requires Jackson 2.9.7+ and explicitly supports the recently released Jackson 2.10 GA. See gh-23522.
In Reactor Core 3.3, the Kotlin extensions are deprecated and replaced by a dedicated reactor-kotlin-extensions project/repo. You may have to add io.projectreactor.kotlin:reactor-kotlin-extensions dependency to your project and update related packages to use the non-deprecated variants.
Spring's annotation retrieval algorithms have been completely revised for efficiency and consistency, as well as for potential optimizations through annotation presence hints (e.g. from a compile-time index). This may have side effects -- for example, finding annotations in places where they haven't been found before or not finding annotations anymore where they have previously been found accidentally. While we don't expect common Spring applications to be affected, annotation declaration accidents in application code may get uncovered when you upgrade to 5.2. For example, all annotations must now be annotated with @Retention(RetentionPolicy.RUNTIME) in order for Spring to find them. See gh-23901, gh-22886, and gh-22766.
@RequestMapping() and meta-annotated variants @GetMapping(), PostMapping(), etc., without explicitly declared path patterns are now equivalent to RequestMapping("") and match only to URLs with no path. In the absence of declared patterns previously the path was not checked thereby matching to any path. If you would like to match to all paths, please use "/**" as the pattern. gh-22543
@Bean methods in Web**ConfigurationSupport now declare bean dependencies as method arguments rather than use method calls to make it possible to avoid creating proxies for bean methods via @Configuration(proxyBeanMethods=false) which Spring Boot 2.2 now does. This should not affect existing applications but if sub-classing Web**ConfigurationSupport (or DelegatingWeb**Configuration) and using proxyBeanMethods=false be sure to also to declare dependent beans as method arguments rather than using method calls. See gh-22596
Since the related Chrome bug is now fixed since September 2017, Spring Framework 5.2 deprecates MediaType.APPLICATION_JSON_UTF8 and MediaType.APPLICATION_PROBLEM_JSON_UTF8 in favor of MediaType.APPLICATION_JSON and MediaType.APPLICATION_PROBLEM_JSON and uses them by default. As a consequence, integration tests relying on the default JSON content type may have to be updated. See gh-22788 for more details.
CORS handling has been significantly updated in Spring Framework 5.2:
- CORS processing is now only used for CORS-enabled endpoints
- CORS processing for skipped for same-origin requests with an
Originheader - Vary headers are added for non-CORS requests on CORS endpoints
These changes introduce an AbstractHandlerMapping#hasCorsConfigurationSource method (in both Spring MVC and WebFlux) in order to be able to check CORS endpoints efficiently. When upgrading to Spring Framework 5.2, handler mapping extending AbstractHandlerMapping and supporting CORS should override hasCorsConfigurationSource with their custom logic.
Config options for suffix pattern matching in RequestMappingHandlerMapping have been deprecated, and likewise config options to resolve acceptable media types from the extension of a request path in ContentNegotiationManagerFactoryBean have also been deprecated. This is aligned with defaults in Spring Boot auto configuration and Spring WebFlux does not offer such options. See gh-24179 and related issues for details and further plans towards 5.3.
Custom implementations of Encoder must implement the new encodeValue which is invoked from ServerSentEventHttpMessageWriter or otherwise that would fail at runtime.
The mock JNDI support in the spring-test module has been deprecated. If you have been using classes such as the SimpleNamingContext and SimpleNamingContextBuilder, you are encouraged to migrate to a complete JNDI solution from a third party such as Simple-JNDI. [gh-22779]
Spring Framework 5.1 requires JDK 8 or higher and specifically supports JDK 11 (as the next long-term support release) for the first time. We strongly recommend an upgrade to Spring Framework 5.1 for any applications targeting JDK 11, delivering a warning-free experience on the classpath as well as the module path.
Please note that developing against JDK 11 is not officially supported with any older version of the core framework. Spring Framework 5.0.9+ and 4.3.19+ just support deploying Java 8 based applications to a JVM 11 runtime environment (using -target 1.8; see below), accepting JVM-level warnings on startup.
Spring Framework 5.1 uses a patched ASM 7.0 fork which is prepared for JDK 11/12 and their new bytecode levels but not battle-tested yet. Spring Framework 5.1.x will track further ASM revisions on the way to JDK 12, also hardening bytecode compatibility with JDK 11.
For a defensive upgrade strategy, consider compiling your application code with JDK 8 as a target (-target 1.8), simply deploying it to JDK 11. This makes your bytecode safer to parse not only for Spring's classpath scanning but also for other bytecode processing tools.
Spring Framework 5.1 uses a patched CGLIB 3.2 fork that delegates to JDK 9+ API for defining classes at runtime. Since this code path is only active when actually running on JDK 9 or higher (in particular necessary on JDK 11 where an alternative API for defining classes has been removed), side effects might show up when upgrading existing applications to JDK 11.
Spring has a fallback in place which tries to mitigate class definition issues, possibly leading to a JVM warning being logged, whereas the standard code path delivers a warning-free experience on JDK 11 for regular class definition purposes. Consider revisiting your class definitions and bytecode processing tools in such a scenario, upgrading them to JDK 11 policies.
The core container has been fine-tuned for Graal compatibility (native images on Substrate VM) and generally optimized for less startup overhead and less garbage collection pressure. As part of this effort, several introspection algorithms have been streamlined towards avoiding unnecessary reflection steps, potentially causing side effects for annotations declared outside of well-defined places.
As per their original definition, nested configuration classes are only detected on top-level @Configuration or other @Component-stereotyped classes now, not on plain usage of @Import or @ComponentScan. Older versions of Spring over-introspected nested classes on non-stereotyped classes, causing significant startup overhead in some scenarios.
In case of accidentally relying on nested class detection on plain classes, simply declare those containing classes with a configuration/component stereotype.
"Forwarded" and "X-Forwarded-*" headers, which reflect the client's original address, are no longer checked individually in places where they apply, e.g. same origin CORS checks, MvcUriComponentsBuilder, etc.
Applications are expected to use one of:
- Spring Framework's own
ForwardedHeaderFilter. - Support for forwarded headers from the HTTP server or proxy.
Note that ForwardedHeaderFilter can be configured in a safe mode where it checks and discards such headers so they cannot impact the application.
The encoding mode of DefaultUriBuilderFactory has been switched to enforce stricter encoding of URI variables by default. This could impact any application using the WebClient with default settings, or any application using DefaultUriBuilderFactory directly. See the "Encoding URIs" section and also the Javadoc for DefaultUriBuilderFactory#setEncodingMode.
The produces condition of an @RequestMapping no longer impacts the content type of error responses.
The integration with Apache Commons FileUpload now aggregates multipart parameter values with other request parameters from the query, as required by Servlet spec, section 3.1. Previously it returned only multipart parameter values if present.
The built-in support for HTTP OPTIONS in @RequestMapping methods now consistently adds HTTP OPTIONS as one of the supported HTTP methods, whereas previously it did not.
Spring Framework 5.0 requires JDK 8 (Java SE 8), since its entire codebase is based on Java 8 source code level and provides full compatibility with JDK 9 on the classpath as well as the module path (Jigsaw). Java SE 8 update 60 is suggested as the minimum patch release for Java 8, but it is generally recommended to use a recent patch release.
The Java EE 7 API level is required in Spring's corresponding modules now, with runtime support for the EE 8 level:
- Servlet 3.1 / 4.0
- JPA 2.1 / 2.2
- Bean Validation 1.1 / 2.0
- JMS 2.0
- JSON Binding API 1.0 (as an alternative to Jackson / Gson)
- Tomcat 8.5+
- Jetty 9.4+
- WildFly 10+
- WebSphere 9+
- with the addition of Netty 4.1 and Undertow 1.4 for Spring WebFlux
- Jackson 2.9+
- EhCache 2.10+
- Hibernate 5.0+
- OkHttp 3.0+
- XmlUnit 2.0+
- Package beans.factory.access (BeanFactoryLocator mechanism).
- Including
SpringBeanAutowiringInterceptorfor EJB3 which was based on such a statically shared context. Preferably integrate a Spring backend via CDI instead.
- Including
- Package jdbc.support.nativejdbc (NativeJdbcExtractor mechanism).
- Superseded by the native
Connection.unwrapmechanism in JDBC 4. There is generally very little need for unwrapping these days, even against the Oracle JDBC driver.
- Superseded by the native
- Package
mock.staticmockremoved fromspring-aspectsmodule.- No support for
AnnotationDrivenStaticEntityMockingControlanymore.
- No support for
- Packages
web.view.tiles2andorm.hibernate3/hibernate4dropped.- Minimum requirement: Tiles 3 and Hibernate 5 now.
- Many deprecated classes and methods removed across the codebase.
- A few compromises made for commonly used methods in the ecosystem.
- Note that several deprecated methods have been removed from the JSP tag library as well.
- e.g. FormTag's "commandName" attribute, superseded by "modelAttribute" years ago.
The Spring Framework no longer supports: Portlet, Velocity, JasperReports, XMLBeans, JDO, Guava (replaced by the Caffeine support). If those are critical to your project, you should stay on Spring Framework 4.3.x (supported until 2020). Alternatively, you may create custom adapter classes in your own project (possibly derived from Spring Framework 4.x).
Spring Framework 5.0 comes with its own Commons Logging bridge in the form of the 'spring-jcl' module that 'spring-core' depends on. This replaces the former dependency on the 'commons-logging' artifact which required an exclude declaration for switching to 'jcl-over-slf4j' (SLF4J / Logback) and an extra bridge declaration for 'log4j-jcl' (Log4j 2.x).
Now, 'spring-jcl' itself is a very capable Commons Logging bridge with first-class support for Log4j 2, SLF4J and JUL (java.util.logging), working out of the box without any special excludes or bridge declarations for all three scenarios.
You may still exclude 'spring-jcl' from 'spring-core' and bring in 'jcl-over-slf4j' as your choice, in particular for upgrading an existing project. However, please note that 'spring-jcl' can easily supersede 'jcl-over-slf4j' by default for a streamlined Maven dependency setup, reacting to the plain presence of the Log4j 2.x / Logback core jars at runtime.
Please note: For a clean classpath arrangement (without several variants of Commons Logging on the classpath), you might have to declare explicit excludes for 'commons-logging' and/or 'jcl-over-slf4j' in other libraries that you're using.
CORS support has been updated to be more secured by default and more flexible.
When upgrading, be aware that allowCredentials default value has been changed to false and now requires to be explicitly set to true if cookies or authentication are needed in CORS requests. This can be done at controller level via @CrossOrigin(allowCredentials="true") or configured globally via WebMvcConfigurer#addCorsMappings.
CORS configuration combination logic has also been slightly modified to differentiate user defined * values where additive logic should be used and default @CrossOrigin values which should be replaced by any user provided values.