If you want jetty to support hot deployment, you don’t need to restart jetty every time you finish changing files, and modify the configuration of jetty to support hot deployment
org.mortbay.jetty jetty-maven-plugin 8.1 .2.v20120308 1 /< /contextPath> ${project.build.directory}/${project.build.finalName}.war ${basedir}/WebRoot
The red part is to enable jetty to support hot deployment. During learning, record it!