4.0.0 org.springframework.boot spring-boot-starter-parent 2.2.1.RELEASE com.bruis learnnetty 0.0.1-SNAPSHOT learnnetty Project for Learn Netty 1.8 4.1.6.Final org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test io.netty netty-all ${netty-all.version} org.springframework.boot spring-boot-maven-plugin org.apache.maven.plugins maven-compiler-plugin 8 8