Spring5 New Features

© Copyright 2017 Pivotal Software, Inc. All rights Reserved. Version 1.0
Jay Lee(jaylee@pivotal.io)
November 2017
Spring 5 New Features

Spring 5 Major Changes
● Java 9 Compatible
● JavaEE8 Support
● HTTP/2 Support
● Reactive: WebFlux, Router Functions
● Functional Bean Configuration
● JUnit 5
● Portlet Deprecated

Baseline Changes
Version Upgrades introduced in Spring 5
●JDK 8+
●Servlet 3.1+
●JMS 2.0
●JPA 2.1
●JavaEE7+

Baseline Changes – Java9 Jigsaw
SPR-13501: Declare Spring modules with JDK 9 module metadata is
still Open
Manifest-Version: 1.0
Implementation-Title: spring-core
Automatic-Module-Name: spring.core
Implementation-Version: 5.0.2.BUILD-SNAPSHOT
Created-By: 1.8.0_144 (Oracle Corporation)

JavaEE 8 GA – Sep 21, 2017
● CDI 2.0 (JSR 365)
● JSON-B 1.0 (JSR 367)
● Servlet 4.0 (JSR 369)
● JAX-RS 2.1 (JSR 370)
● JSF 2.3 (JSR 372)
● JSON-P 1.1 (JSR 374)
● Security 1.0 (JSR 375)
● Bean Validation 2.0 (JSR 380)
● JPA 2.2 - Maintenance Release

Java API for JSON Binding (JSON-B) 1.0 – JSR 367
Standard Binding Layer for converting Java objects to/from JSON
● Thread Safe
● Apache Johnzon
● Eclipse Yasson

Person person = new Person();
person.name = ”Jay Lee";
person.age = 1;
person.email = “jaylee@pivotal.io”;
Jsonb jsonb = JsonbBuilder.create();
String JsonToString = jsonb.toJson(person);
System.out.println(JsonToString );
person = jsonb.fromJson("{"name":”Jay
Lee","age":1,”email":”jaylee@pivotal.io"}", Person.class);

<dependency>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-json_1.1_spec</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.apache.johnzon</groupId>
<artifactId>johnzon-jsonb</artifactId>
<version>1.1.5</version>
</dependency>

<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.json</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse</groupId>
<artifactId>yasson</artifactId>
</dependency>

New HttpMessageConverter for JSON-B in Spring5
@Bean
public HttpMessageConverters customConverters() {
Collection<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
JsonbHttpMessageConverter jsonbHttpMessageConverter = new JsonbHttpMessageConverter();
messageConverters.add(jsonbHttpMessageConverter);
return new HttpMessageConverters(true, messageConverters);
}

Servlet 4.0 – Server Push
Server pushes resources to Clients, efficient way to transfer
resources using HTTP/2
@GetMapping("/pushbuilder")
public String getPage(PushBuilder builder) {
builder.path("/scripts.js").push();
builder.path("/styles.css").push();
return "index";
}

Servlet 4.0 – HttpServletMapping
Provide Runtime Discovery of URL Mappings
@GetMapping("/servlet4")
public void index(final HttpServletRequest request) {
HttpServletMapping mapping =
request.getHttpServletMapping();
System.out.println(mapping.getServletName());
System.out.println(mapping.getPattern());
System.out.println(mapping.getMappingMatch().name());
System.out.println(mapping.getMatchValue());
}

Bean Validation 2.0 – JSR 380
1.1 was introduced in 2013, lacking of supports for new Java8, 9.
● New JDK Types Including LocalTime, Optional and etc
● Lambda
● Type Annocation
● @Email, @Positive, @PositiveOrZero, @Negative, @NegativeOrZero,
@PastOrPresent, @FutureOrPresent, @NotEmpty, and @NotBlank.

Spring 5 Major Changes
● Logging Enhancement
● Performance Enhancement
● Functional Bean Configuration
● JSR 305
● Spring MVC - HTTP/2 Support,
● Reactive: WebFlux, Router Functions
● JUnit 5

Spring 5 – XML Configuration Changes
Streamlined to use unversioned Schema

Spring 5 - Logging Enhancement
spring-jcl replaces Commons Logging by default
● Autodetecting Log4j 2.x, SLF4J, and JUL (java.util.logging) by Class
Loading

Spring 5 - Logging Enhancement

Spring 5 - Component Scanning Enhancement
Component scanning time reduced by index, improving Start Up Time
• META-INF/spring.components is created at Compile Time
• @Indexed Annotation
• org.springframework.context.index.CandidateComponentsIndex
• -Dspring.index.ignore=true to fall back to old mechanism
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Component {
String value() default "";
}
@Target({ElementType.TYPE})
@Documented
@Indexed
public @interface Component {
String value() default "";
}

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-indexer</artifactId>
<optional>true</optional>
</dependency>

• JMH Result, ClassPath Scanning versus Index Scanning
• Noticeable Differences in having more classes
https://github.com/snicoll-scratches/test-spring-components-index

Spring 5 - Functional Bean Configuration
Support for Functional Bean Registration in GenericApplicationContext,
AnnotationConfigApplicationContext
● Very efficient, no reflection, no CGLIB proxies involved
● Lambda with Supplier act as a FactoryBean

Spring 5 - Functional Bean Configuration
@Autowired
GenericApplicationContext ctx;
@Test
public void functionalBeanTest() {
ctx.registerBean(Person.class, () -> new Person());
ctx.registerBean("personService", Person.class,
() -> new Person(), bd -> bd.setAutowireCandidate(false));
ctx.registerBean(”carService", Car.class,
() -> new Car(), bd ->
bd.setScope(BeanDefinition.SCOPE_PROTOTYPE));
}

Spring 5 – JSR 305
SPR-15540 Introduce null-safety of Spring Framework API
• Becomes Kotlin Friendly (-Xjsr305=strict as of 1.1.51)
https://github.com/spring-projects/spring-framework/commit/f813712f5b413b354560cd7cc006352e9defa9a3

Spring 5 – JSR 305 Nullable
New Annotation org.springframework.lang.NonNull,
org.springframework.lang.Nullable leverages JSR 305
@Target({ElementType.METHOD, ElementType.PARAMETER,
ElementType.FIELD})
@Documented
@Nonnull
@TypeQualifierNickname
public @interface NonNull {
}

Spring 5 – Spring MVC
HTTP/2 and Servlet 4.0
• PushBuilder
• WebFlux
• Support Reactor 3.1, RxJava 1.3, 2.1 as return values
• JSON BINDING API
• Jackson 2.9
• Protobuf 3.0
• URL Matching

Spring 5 – HTTP/2(Servlet 4.0) Supported Containers
● Tomcat 9.0
● Jetty 9.3
● Undertow 1.4
ex. Spring Boot
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-juli</artifactId>
</dependency>

Spring 5 MVC – Multipart File Size
MaxUploadSizeExceededException will be thrown for multipart size
overrun
• Default Value
• Two Properties(Default Value)
• spring.servlet.multipart.max-file-size=1MB
spring.servlet.multipart.max-request-size=10MB

Spring 5 MVC – URL Matcher changed
PathPatternParser is alternative to Traditional AntPathMatcher for
URL Matching
• org.springframework.web.util.patterns.PathPattern
Examples:
/pages/t?st.html —/pages/test.html, /pages/tast.html /pages/toast.html
/resources/*.png — matches all .png files in the resources directory
/resources/** — matches all files underneath the /resources/ path,
including /resources/image.png and /resources/css/spring.css
/resources/{*path} — matches all files underneath the /resources/ path and captures their relative
path in a variable named "path"; /resources/image.png will match with ”path" -> "/image.png",
and /resources/css/spring.css will match with ”path" -> "/css/spring.css"
/resources/{filename:w+}.dat will match /resources/spring.dat and assign the value "spring" to
the filename variable

Spring 5 MVC – Throwing Exception from Controller
ResponseStatusException is Introduced to throw Exception in MVC
• SPR-14895:Allow HTTP status exceptions to be easily thrown from
Controllers
• ResponseEntity(HttpStatus.BAD_REQUEST)?
@GetMapping ( "/throw" )
public void getException () {
throw new ResponseStatusException( HttpStatus. BAD_REQUEST
, "request invalid." );
}

Spring 5 WebFlux – WebClient
Reactive Web Client introduced in Spring 5, alternative to
RestTemplate
● AsyncRestTemplate is deprecated
WebClient client= WebClient.create();
Mono<Person> person=client
.get()
.uri("http://jay-person.cfapps.io/{name}",name)
.retrieve()
.bodyToMono(Person.class);

Spring 5 WebFlux –WebTestClient
@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureWebTestClient
public class MicrometerApplicationTests {
@Autowired
WebTestClient client;
@Test
public void testWebClient() {
client.get().uri("/person/Jay")
.exchange()
.expectBody(Person.class)
.consumeWith(result ->
assertThat(result.getResponseBody().getName()).isEqualTo("Jay Lee"));
}

Spring 5 WebFlux – Server
RouterFunction is introduced for functional programming
RouterFunction<?> route = route(GET("/users"), request ->
ok().body(repository.findAll(), Person.class))
.andRoute(GET("/users/{id}"), request ->
ok().body(repository.findOne(request.pathVariable("id")),
Person.class))
.andRoute(POST("/users"), request ->
ok().build(repository.save(request.bodyToMono(Person.class)).then())
);

Spring Boot and Cloud
Spring Boot 2.0 will be GA in Feb 2018
● Spring Cloud Finchley Release Train based on Spring Boot 2.0
● Spring Cloud Gateway
● Spring Cloud Function

Spring Release Calendar
https://spring-calendar.cfapps.io/

Spring 5 – JUnit 5 Jupiter Support
Complete Support provided for Jupiter APIs
• @SpringJUnitConfig
• @SpringJUnitWebConfig
• @EnabledIf
• @DisabledIf
• Parallel Test Execution Support

Spring 5 – JUnit 5 Jupiter Support
@SpringJUnitConfig(TestConfiguration.class)
public class MicrometerApplicationTests {
@EnabledIf(expression = "${tests.enabled}", loadContext = true)
@Test
void givenEnabledIfExpression_WhenTrue_ThenTestExecuted() {
assertTrue(true);
}
@EnabledIf("#{systemProperties['java.version'].startsWith('1.8')}")
@Test
void givenEnabledIfSpel_WhenTrue_ThenTestExecuted() {
assertTrue(true);
}
}

Spring 5 – Deprecated APIs
HTTP/2 and Servlet 4.0
• Hibernate 3, 4
• Portlet
• Velocity
• JasperReports
• XMLBeans
• JDO
• Guava

Spring5 New Features

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