报错代码
Could not resolve archetype org.apache.maven.archetypes:maven-archetype-webapp:1.0 from any of the configured repositories. Could not resolve artifact org.apache.maven.archetypes:maven-archetype-webapp:pom:1.0 Failure to transfer org.apache.maven.archetypes:maven-archetype-webapp:pom:1.0 from http://maven.aliyun.com/nexus/content/groups/public was cached in the local repository, resolution will not be reattempted until the update interval of nexus-aliyun has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.archetypes:maven-archetype-webapp:pom:1.0 from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public): maven.aliyun.com Failure to transfer org.apache.maven.archetypes:maven-archetype-webapp:pom:1.0 from http://maven.aliyun.com/nexus/content/groups/public was cached in the local repository, resolution will not be reattempted until the update interval of nexus-aliyun has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.archetypes:maven-archetype-webapp:pom:1.0 from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public): maven.aliyun.com
原因：
1、Catalog 相关类型缺失；
2、ide下载相关jar包时未能完整下载
针对以上两种原因的解决方案如下：
1、配置Catalog
在eclipse中，点击window-->preferences-->maven-->archetype,在archetype页面中点击 “Add Remote Catalog”,在弹出框的catalog File输入框中填写“http://repo1.maven.org/maven2/archetype-catalog.xml”（引号不要），下面description根据自己喜好填写。然后再次创建maven项目时选择自己刚才新建的catalog，然后再选择 org.apache.maven.archetypes maven-archetype-webapp；
2、重新下载maven-archetype-webapp-1.0.jar
如果以上方法未能解决问题，那就重新下载maven-archetype-webapp-1.0.jar即可。方法为：进入maven本地仓库org\apache\maven\archetypes\maven-archetype-webapp\1.0目录下删除.lastUpdate文件，当再次创建web时项目时，ide会自动下载相关的jar包。
注：有时候可能创建时不是报的此错，比如什么plugin无法找到，此时也可尝试用上面的第2种方式，只是要注意文件路径为 “Could not resolve”后面的那个xxx.xxx.xxx...文件夹，找到对应的.lastUpdate文件删除掉。