4.0.0 org.springframework.boot spring-boot-starter-parent 2.1.3.RELEASE com.example demo 0.0.1-SNAPSHOT demo Demo project for Spring Boot 1.8 org.springframework.boot spring-boot-starter-websocket org.springframework.boot spring-boot-starter-test test com.google.code.gson gson 2.8.5 org.springframework.boot spring-boot-maven-plugin repackage