4.0.0 discord4j discord4j Demo Discord bot using Discord4J + Spring Boot com.baeldung saas-modules 1.0.0-SNAPSHOT org.springframework.boot spring-boot-starter org.springframework.boot spring-boot-starter-webflux org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-starter-test test org.junit.vintage junit-vintage-engine com.discord4j discord4j-core ${discord4j-core.version} org.springframework.boot spring-boot-maven-plugin 3.1.1