[JAVA] Spring Boot 2.3 Application Availability

[Spring Boot Features --1.6. Application Availability](https://docs.spring.io/spring-boot/docs/2.3.0.RELEASE/reference/html/spring-boot-features.html#boot-features-application -A memo that just moved (availability).


plugins {
  id 'org.springframework.boot' version '2.3.0.RELEASE'
  id 'io.spring.dependency-management' version '1.0.9.RELEASE'
  id 'java'

sourceCompatibility = '11'
repositories {
dependencies {
  implementation 'org.springframework.boot:spring-boot-starter-actuator'
  implementation 'org.springframework.boot:spring-boot-starter-web'
  testImplementation('org.springframework.boot:spring-boot-starter-test') {
    exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
test {
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

public class Main {
  public static void main(String[] args) {
    SpringApplication.run(Main.class, args);



Now when you access `http: // localhost: 8080 / actuator / health / liveness``` or `http: // localhost: 8080 / actuator / health / readiness```, you will get the following:


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