JAVA: spring 5 新特性
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What's New in Version 5.0
JDK 8+ and Java EE 7+ Baseline
Entire framework codebase based on Java 8 source code level now.
Improved readability through inferred generics, lambdas, etc.
Conditional support for Java 8 features now in straight code.
Full compatibility with JDK 9 for development and deployment.
On classpath as well as module path (with stable automatic module names).
Framework build and test suite passes on JDK 9 (runs on JDK 8 by default).
Java EE 7 API level required in Spring's corresponding features now.
Servlet 3.1, Bean Validation 1.1, JPA 2.1, JMS 2.0
Recent servers: e.g. Tomcat 8.5+, Jetty 9.4+, WildFly 10+
Compatibility with Java EE 8 API level at runtime.
Servlet 4.0, Bean Validation 2.0, JPA 2.2, JSON Binding API 1.0
Tested against Tomcat 9.0, Hibernate Validator 6.0, Apache Johnzon 1.1
Removed Packages, Classes and Methods
Package
beans.factory.access
(BeanFactoryLocator
mechanism).Package
jdbc.support.nativejdbc
(NativeJdbcExtractor
mechanism).Package
mock.staticmock
removed fromspring-aspects
module.No support for
AnnotationDrivenStaticEntityMockingControl
anymore.Packages
web.view.tiles2
andorm.hibernate3/hibernate4
dropped.Minimum requirement: Tiles 3 and Hibernate 5 now.
Dropped support: Portlet, Velocity, JasperReports, XMLBeans, JDO, Guava.
Recommendation: Stay on Spring Framework 4.3.x for those if needed.
Many deprecated classes and methods removed across the codebase.
A few compromises made for commonly used methods in the ecosystem.
General Core Revision
JDK 8+ enhancements:
Efficient method parameter access based on Java 8 reflection enhancements.
Selective declarations of Java 8 default methods in core Spring interfaces.
Consistent use of JDK 7
Charset
andStandardCharsets
enhancements.JDK 9 compatibility:
Avoiding JDK APIs which are deprecated in JDK 9 wherever possible.
Consistent instantiation via constructors (with revised exception handling).
Defensive use of reflection against core JDK classes.
Non-null API declaration at the package level:
Nullable arguments, fields and return values explicitly annotated with
@Nullable
.Primarily for use with IntelliJ IDEA and Kotlin, but also Eclipse and FindBugs.
Some Spring APIs are not tolerating null values anymore (e.g. in
StringUtils
).Resource
abstraction providesisFile
indicator for defensivegetFile
access.Also features NIO-based
readableChannel
accessor in theResource
interface.File system access via NIO.2 streams (no
FileInput/OutputStream
used anymore).Spring Framework 5.0 comes with its own Commons Logging bridge out of the box:
spring-jcl
instead of standard Commons Logging; still excludable/overridable.Autodetecting Log4j 2.x, SLF4J, JUL (java.util.logging) without any extra bridges.
spring-core
comes with ASM 6.0 (next to CGLIB 3.2.5 and Objenesis 2.6).
Core Container
Support for any
@Nullable
annotations as indicators for optional injection points.Functional style on
GenericApplicationContext
/AnnotationConfigApplicationContext
Supplier
-based bean registration API with bean definition customizer callbacks.Consistent detection of transaction, caching, async annotations on interface methods.
In case of CGLIB proxies.
XML configuration namespaces streamlined towards unversioned schemas.
Always resolved against latest
xsd
files; no support for deprecated features.Version-specific declarations still supported but validated against latest schema.
Support for candidate component index (as alternative to classpath scanning).
Spring Web MVC
Full Servlet 3.1 signature support in Spring-provided
Filter
implementations.Support for Servlet 4.0
PushBuilder
argument in Spring MVC controller methods.MaxUploadSizeExceededException
for Servlet 3.0 multipart parsing on common servers.Unified support for common media types through
MediaTypeFactory
delegate.Superseding use of the Java Activation Framework.
Data binding with immutable objects (Kotlin / Lombok /
@ConstructorProperties
)Support for the JSON Binding API (with Eclipse Yasson or Apache Johnzon as an alternative to Jackson and GSON).
Support for Jackson 2.9.
Support for Protobuf 3.
Support for Reactor 3.1
Flux
andMono
as well as RxJava 1.3 and 2.1 as return values from Spring MVC controller methods targeting use of the new reactiveWebClient
(see below) or Spring Data Reactive repositories in Spring MVC controllers.New
ParsingPathMatcher
alternative toAntPathMatcher
with more efficient parsing and extended syntax.@ExceptionHandler
methods allowRedirectAttributes
arguments (and therefore flash attributes).Support for
ResponseStatusException
as a programmatic alternative to@ResponseStatus
.Support script engines that do not implement
Invocable
via direct rendering of the script provided usingScriptEngine#eval(String, Bindings)
, and also i18n and nested templates inScriptTemplateView
via the newRenderingContext
parameter.Spring's FreeMarker macros (
spring.ftl
) use html output formatting now (requiring FreeMarker 2.3.24+).
Spring WebFlux
New spring-webflux module, an alternative to
spring-webmvc
built on a reactive foundation -- fully asynchronous and non-blocking, intended for use in an event-loop execution model vs traditional large thread pool with thread-per-request execution model.Reactive infrastructure in
spring-core
such asEncoder
andDecoder
for encoding and decoding streams of Objects;DataBuffer
abstraction, e.g. for using JavaByteBuffer
or NettyByteBuf
;ReactiveAdapterRegistry
for transparent support of reactive libraries in controller method signatures.Reactive infrastructure in
spring-web
includingHttpMessageReader
andHttpMessageWriter
that build on and delegate toEncoder
andDecoder
; serverHttpHandler
with adapters to (non-blocking) runtimes such as Servlet 3.1+ containers, Netty, and Undertow;WebFilter
,WebHandler
and other non-blocking contract alternatives to Servlet API equivalents.@Controller
style, annotation-based, programming model, similar to Spring MVC, but supported in WebFlux, running on a reactive stack, e.g. capable of supporting reactive types as controller method arguments, never blocking on I/O, respecting backpressure all the way to the HTTP socket, and running on extra, non-Servlet containers such as Netty and Undertow.New functional programming model ("WebFlux.fn") as an alternative to the
@Controller
, annotation-based, programming model -- minimal and transparent with an endpoint routing API, running on the same reactive stack and WebFlux infrastructure.New
WebClient
with a functional and reactive API for HTTP calls, comparable to theRestTemplate
but through a fluent API and also excelling in non-blocking and streaming scenarios based on WebFlux infrastructure; in 5.0 theAsyncRestTemplate
is deprecated in favor of theWebClient
.
Kotlin support
Null-safe API when using Kotlin 1.1.50 or higher.
Support for Kotlin immutable classes with optional parameters and default values.
Functional bean definition Kotlin DSL.
Functional routing Kotlin DSL for WebFlux.
Leveraging Kotlin reified type parameters to avoid specifying explicitly the
Class
to use for serialization/deserialization in various APIs likeRestTemplate
or WebFlux APIs.Kotlin null-safety support for
@Autowired
/@Inject
and@RequestParam
/@RequestHeader
/etc annotations in order to determine if an injection point or handler method parameter is required or not.Kotlin script support in
ScriptTemplateView
for both Spring MVC and Spring WebFlux.Array-like setters added to
Model
,ModelMap
andEnvironment
.Support for Kotlin autowired constructor with optional parameters.
Kotlin reflection is used to determine interface method parameters.
Testing Improvements
Complete support for JUnit 5's Jupiter programming and extension models in the Spring TestContext Framework.
SpringExtension
: an implementation of multiple extension APIs from JUnit Jupiter that provides full support for the existing feature set of the Spring TestContext Framework. This support is enabled via@ExtendWith(SpringExtension.class)
.@SpringJUnitConfig
: a composed annotation that combines@ExtendWith(SpringExtension.class)
from JUnit Jupiter with@ContextConfiguration
from the Spring TestContext Framework.@SpringJUnitWebConfig
: a composed annotation that combines@ExtendWith(SpringExtension.class)
from JUnit Jupiter with@ContextConfiguration
and@WebAppConfiguration
from the Spring TestContext Framework.@EnabledIf
: signals that the annotated test class or test method is enabled if the supplied SpEL expression or property placeholder evaluates totrue
.@DisabledIf
: signals that the annotated test class or test method is disabled if the supplied SpEL expression or property placeholder evaluates totrue
.Support for parallel test execution in the Spring TestContext Framework.
New before and after test execution callbacks in the Spring TestContext Framework with support for TestNG, JUnit 5, and JUnit 4 via the
SpringRunner
(but not via JUnit 4 rules).New
beforeTestExecution()
andafterTestExecution()
callbacks in theTestExecutionListener
API andTestContextManager
.MockHttpServletRequest
now hasgetContentAsByteArray()
andgetContentAsString()
methods for accessing the content (i.e., request body).The
print()
andlog()
methods in Spring MVC Test now print the request body if the character encoding has been set in the mock request.The
redirectedUrl()
andforwardedUrl()
methods in Spring MVC Test now support URI templates with variable expansion.XMLUnit support upgraded to 2.3.
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