问题：Could not find artifact org.apache.tomcat.maven:tomcat8-maven-plugin:pom
解决：配置的阿里云镜像中没有这个jar包，在pom.xml中增加插件仓库即可
<!--tomcat插件仓库-->
<pluginRepositories>
<pluginRepository>
<id>alfresco-public</id>
<url>https://artifacts.alfresco.com/nexus/content/groups/public</url>
</pluginRepository>
<pluginRepository>
<id>alfresco-public-snapshots</id>
<url>https://artifacts.alfresco.com/nexus/content/groups/public-snapshots</url>
<snapshots>
<enabled>true</enabled>
<updatePolicy>daily</updatePolicy>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>beardedgeeks-releases</id>
<url>http://beardedgeeks.googlecode.com/svn/repository/releases</url>
</pluginRepository>
</pluginRepositories>
<!--插件坐标-->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat8-maven-plugin</artifactId>
<version>3.0-r1655215</version>
</plugin>
