4.0.0 com.baeldung spring-reactor jar 1.0-SNAPSHOT spring-reactor http://maven.apache.org parent-boot-4 com.baeldung 0.0.1-SNAPSHOT ../parent-boot-4 org.springframework.boot spring-boot-starter-web org.springframework spring-web io.projectreactor reactor-bus spring-snapshots Spring Snapshots https://repo.spring.io/libs-snapshot true spring-releases Spring Releases https://repo.spring.io/libs-release