grails run-app appName

| Error
 Resolve error obtaining dependencies: Failed to read artifact descriptor for xalan:serializer:jar:2.7.1 (Use --stacktrace to see the full trace)
| Error
 Required Grails build dependencies were not found. This is normally due to internet connectivity issues (such as a misconfigured proxy) or missing repositories
in grails-app/conf/BuildConfig.groovy. Please verify your configuration to continue.

说明是：

        缺乏jar包。

        查看用户下的.m2是否存在用户jar。

        看下网络是否通。

        用的网络是经过代理访问的，要添加代理服务。