From Spring Boot 2.2 to Spring Boot 2.3 #jsug

© Copyright 2019 Pivotal Software, Inc. All rights Reserved.
From Spring Boot 2.2 to Spring
Boot 2.3
Toshiaki Maki - @making
Stéphane Nicoll - @snicoll

2019 Edition Recap
October 7-10 2019
Austin Convention Center

Java 13
https://github.com/spring-projects/spring-framework/wiki/Spring-Framework-Versions#jdk-version-range

Health Indicator Group
management.endpoint.health.group.liveness.include=ping
management.endpoint.health.group.readiness.include=db,redis
GET /actuator/health/liveness
GET /actuator/health/readiness

Immutable Conﬁguration Properties

@ConfigurationProperties("acme")
@ConstructorBinding
public class AcmeProperties {
private final Duration timeout;
private final DataSize bufferSize;
private final Security security;
public AcmeProperties(@DefaultValue("10s") Duration timeout, DataSize bufferSize,
Security security) {
this.timeout = timeout;
this.bufferSize = bufferSize;
this.security = security;
}
...
}

@ConstructorBinding
data class AcmeProperties(val timeout: Duration = Duration.ofSeconds(10),
val bufferSize: DataSize?,
val security: Security) {
...
}

@ConstructorBinding
data class AcmeProperties(val timeout: Duration = Duration.ofSeconds(10),
val bufferSize: DataSize?,
val security: Security) {
...
}
https://github.com/snicoll/demo-immutable-conﬁg-props

JUnit 5
// @ExtendWith(SpringExtension.class)
@SpringBootTest
class MyApplicationTests {
@Test
void resourceFileCreated(@TempDir Path tmpDir) {
// ...
}
}

Top3
?*
!
* Sep 2018 - Sep 2019

Top3
?*
!
"
* Sep 2018 - Sep 2019

Top3
?*
!
"
#
* Sep 2018 - Sep 2019

Top3
?*
!
"
#
* Sep 2018 - Sep 2019
$

Top3
?*
!
"
#
* Sep 2018 - Sep 2019
$ 6

?*
Web IDECLI
* Sep 2018 - Sep 2019

?*
Web IDECLI
* Sep 2018 - Sep 2019 ( )

GraalVM
• Oracle Universal Virtual Machine

• (Java, JavaScript, Python, Ruby, R, ...)

• Native Image

GraalVM Native Image
• JIT (
)

• Reﬂection Dynamic Proxy, Resource Access

• CGLIB

GraalVM Native Image
• JIT (
)

• Reﬂection Dynamic Proxy, Resource Access

• CGLIB
🤔

Spring with GraalVM native image

2018
2019
2020

2018
2019
2020
•Spring 5.1 native image initial support
•Manual conﬁgurations + Netty + Functional
Bean Registration

2018
2019
2020
Bean Registration
•Spring 5.2 CGLIB (Bean Lite mode)
• spring-graal-native

2018
2019
2020
Bean Registration
•Spring 5.2 CGLIB (Bean Lite mode)
• spring-graal-native
•Spring 5.3 out of the box native image

spring-graal-native
• Spring 5.3 GraalVM Native Image

• GraalVM Feature Spring

• Reﬂection Dynamic Proxy
<dependency> 
<groupId>org.springframework.experimental</groupId> 
<artifactId>spring-graal-native-feature</artifactId> 
</dependency>

https://github.com/making/demo-spring-fest-2019

DEMO
https://github.com/making/demo-spring-fest-2019

Spring Cloud Release Train
March 2015 Angel
May 2016 Brixton
September 2016 Camden
April 2017 Dalston
November 2017 Edgeware
June 2018 Finchly
January 2019 Greenwich
November 2019 Hoxton

Maintenace Mode
•

• Fix

• PR

Spring Cloud After Netflix Era
Design Pattern Current Replace
Client Side LoadBalancer Spring Cloud Netflix Ribbon Spring Cloud LoadBalancer
Circuit Breaker Spring Cloud Netflix Hystrix
Spring Cloud Circuit Breaker
+ Resilience4j
Circuit Breaker Dashboard Spring Cloud Netflix Turbine Micrometer + Prometheus
API Gateway Spring Cloud Netflix Zuul Spring Cloud Gateway

@SpringBootApplication
@EnableBinding(Processor.class)
public class SampleApplication {
@StreamListener(Processor.INPUT)
@SendTo(Processor.OUTPUT)
public String uppercase(String value) {
return value.toUpperCase();
}
}
Spring Cloud Stream

@Bean
public Function<String, String> uppercase() {
return value -> value.toUpperCase();
}
}
Spring Cloud Stream

@Bean
public Function<String, String> uppercase() {
return value -> value.toUpperCase();
}
}
Source
Processor
Sink
Supplier
Function
Consumer
Spring Cloud Stream

@Bean
public Function<Flux<String>, Flux<String>> uppercase() {
return flux -> flux.map(value -> value.toUpperCase());
}
}
Spring Cloud Stream

@Bean
public Function<Tuple2<Flux<String>, Flux<Integer>>,
Flux<String>> gather() {
return tuple -> {
Flux<String> stringStream = tuple.getT1();
Flux<String> intStream = tuple.getT2()
.map(String::valueOf);
return Flux.merge(stringStream, intStream);
};
}
}
Spring Cloud Stream

Spring Cloud LoadBalancer
@RestController
public class HelloController {
private final RestTemplate restTemplate;
public HelloController(@LoadBalanced RestTemplate restTemplate) {
this.restTemplate = restTemplate;
}
@GetMapping(path = "/hello")
public String hello() {
return this.restTemplate.getForObject("http://hello-servrice/get",
String.class);
}
}
@LoadBalanced @Bean
public RestTemplate restTemplate(RestTemplateBuilder builder) {
return builder.build();
}

@RestController
private final WebClient webClient;
public HelloController(WebClient.Builder builder,
ReactorLoadBalancerExchangeFilterFunction filter) {
this.webClient = builder.filter(filter).build();
}
public Mono<String> hello() {
return this.webClient.get()
.uri("http://hello-servrice/get")
.rertieve()
.bodyToMono(String.class);
}
}

Circuit Breaker API

4
• Netﬂix Hystrix

• Resilience4j

• Spring Retry

• Alibaba Sentinel

@RestController
private final RestTemplate rt;
private final CircuitBreakerFactory cbf;
public HelloController(RestTemplate rt,
CircuitBreakerFactory cbf) {
this.rt = rt;
this.cbf = cbf;
}
public String hello() {
return this.cbf.create("hello")
.run(() ->
this.rt.getForObject("http://hello-servrice/get", String.class),
e -> "Falllback!");
}
}

@RestController
private final WebClient webClient;
private final ReactiveCircuitBreakerFactory cbf;
public HelloController(WebClient.Builder builder,
ReactiveCircuitBreakerFactory cbf) {
this.webClient = builder.build();
this.cbf = cbf;
}
public Mono<String> hello() {
return this.webClient.get()
.uri("http://hello-servrice/get")
.rertieve()
.bodyToMono(String.class)
.transform(x -> this.cbf.create("hello")
.run(x, e-> Mono.just("Fallback!")));
}
}

You love Containers? We love Containers too!

You love Containers?
You love Kubernetes?
We love Containers too!
We love Kubernetes too!

You love Containers?
You love Kubernetes?
You love Dockerﬁle?
We love Containers too!
We love Kubernetes too!
Hmm... 🤔

Cloud Native Buildpacks
• Heroku / Cloud Foundry Buildpack

• OCI

• Buildpack

OCI
Cloud Native Buildpacks
Builder
OpenJDK CNB
Spring Boot CNB
Node.js CNB
...

pack - Buildpack CLI
•Cloud Native Buildpack Docker CLI

•
https://github.com/buildpacks/pack
pack build <image name> [--builder <builder name>] [--publish]

•Cloud Native Buildpacks Kubernetes

•Kubernetes CRD(Custom Resource Deﬁnition)
Builder / Image
https://github.com/pivotal/kpack
Kpack

Kpack
apiVersion: build.pivotal.io/v1alpha1
kind: Image
metadata:
  name: tutorial-image
spec:
  tag: making/hello-jsug
  serviceAccount: tutorial-service-account
  builder:
    name: default-builder
    kind: ClusterBuilder
  cacheSize: 1.5Gi
  source:
    git:
      url: https://github.com/making/hello-jsug.git
      revision: master

Spring Framework 5.3
• JDK 17 LTS

• JDK 17 LTS
• GraalVM native images

• JDK 17 LTS
• GraalVM native images
• 5.x (RSocket, Coroutines)

Spring Boot 2.3
• Container
• Kubernetes

Spring Boot 2.3
• Container
• Kubernetes
• (Spring Data)

Spring Boot 2.3
• Container
• Kubernetes
• (Spring Data)
• 6 (Apr 2020)

October 2018 Spring Boot 2.1 GA

August 2019 Spring Boot 1 EOL

January 2020 Spring Framework 5.0/4.3 last release

April 2020 Spring Boot 2.3 GA
October 2020 Spring Framework 5.3 / Spring Boot 2.4 GA

November 2020 Spring Boot 2.1 EOL

December 2020 Spring Framework 5.1/4.3 EOL
November 2020 Spring Boot 2.1 EOL

Boot 2.3
@making - @snicoll
Thanks!

Boot 2.3 & 2.4
@making - @snicoll
Thanks!

From Spring Boot 2.2 to Spring Boot 2.3 #jsug

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