1.版本
idea Server URL： https://start.aliyun.com/
springboot：2.6.13
2.报错
打war包时报错：
Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project MQTTService: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode)
3.解决
pom.xml中加
<properties>
...
<failOnMissingWebXml>false</failOnMissingWebXml>
</properties>