4.0.0 dev.marco java-angular-example pom 0.1-SNAPSHOT org.springframework.boot spring-boot-starter-parent 2.4.3 open-api frontend backend org.springframework spring-context-support 5.3.14 org.springframework.boot spring-boot-starter-web 2.6.3 org.springframework.boot spring-boot-starter-test 2.6.3