⭐ New Features
- FormHttpMessageConverter should support non-String form values [SPR-17645] #22174
- spring-jcl routes logging inefficiently against SLF4J with log4j-to-slf4j setup [SPR-17586] #22118
- Allow java.time types for setting the Last-Modified header [SPR-17571] #22103
- StringHttpMessageConverter should assume charset UTF-8 for application/json [SPR-17568] #22100
- NettyDataBufferFactory.join should return original buffer as-is in case of a single element (for compatibility with Netty 4.1.32) [SPR-17560] #22092
- Use Netty's optimized UTF-8 encoding if available [SPR-17558] #22090
- Equals checks to MediaType.ALL should not be affected the presence of parameters [SPR-17550] #22082
- Reactive HTTP header adapters don't print header values in toString [SPR-17546] #22078
- Add ability to retrieve associated ClientRequest from WebClientResponseException [SPR-17087] #21624
🪲 Bug Fixes
- HttpHeaders.EMPTY is not immutable [SPR-17633] #22164
- UriComponentsBuilder.toUriString() is broken [SPR-17630] #22161
- MethodParameter.isOptional() fails with ArrayIndexOutOfBoundsException [SPR-17629] #22160
- MockMvcResultMatchers.forwardedUrl argument is not declared as nullable [SPR-17623] #22155
- Cannot convert from Collection to RegularEnumSet [SPR-17619] #22151
- TomcatHttpHandlerAdapter is not aware of Server[Request|Response]Wrapper [SPR-17611] #22143
- ChannelSendOperator does not propagate cancel signal to the server [SPR-17609] #22141
@ValueOptional<...> field injection fails in case of registered ConversionService [SPR-17607] #22139@Profilemishandles "not" operand mixed with "&" [SPR-17606] #22138- SpEL, error parsing big InlineMap [SPR-17605] #22137
- Composed RequestPredicates have invalid string representation [SPR-17594] #22126
- Regression: IllegalStateException: Ambiguous handler methods is thrown for explicit HEAD mapping [SPR-17593] #22125
- Exporting a lazily initialized bean (which implements SelfNaming and is annotated with ManagedResource annotation) gives IllegalStateException [SPR-17592] #22124
- MockHttpServletRequest changes Accept-Language header values [SPR-17566] #22098
- SpEL variable evaluation fails with NPE against ConcurrentHashMap [SPR-17565] #22097
- WebClient logs "Only one connection receive subscriber allowed" when response status is an error [SPR-17564] #22096
- Potential resource leak in DataSourceUtils.doGetConnection [SPR-17559] #22091
- HibernateTransactionManager (unintentionally) bound to Hibernate 5.2 SharedSessionContractImplementor [SPR-17557] #22089
- Spring JavaMailSenderImpl does not show proper message when recipient list is empty [SPR-17540] #22072
- 'default-lazy-init' attribute is not processed when XSD validation is disabled [SPR-8335] #12983
📔 Documentation
- Incorrect snippet of code in documentation [SPR-17601] #22133
- Duplicate word in spring docs [SPR-17597] #22129
- Typo in SpEL Evaluation Context Sample [SPR-17581] #22113
- Error in reference documentation sentence in part 1.8.1. Customizing Beans by Using a BeanPostProcessor [SPR-17556] #22088
- Doc: Support for validation in WebFlux.fn [SPR-17401] #21934
- Improve docs on concurrent sending with direct use of WebSocket API [SPR-12886] #17484