An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to read repository at https://p3c.alibaba.com/plugin/eclipse/update/plugins/com.alibaba.smartfox.eclipse.plugin_1.0.4.201802010844.jar.
Connection reset
最后换了从https://p3c.alibaba.com/plugin/eclipse/update 上下载了它的离线包(ZIP)，然后复制zip包中的plugin.zip\plugins 目录下的jar包到eclipse安装目录的的 plugins然后运行一下mvn -U clean install 运行后结果都是失败的，多运行几次，然后重启eclipse就可以了
eclipse安装阿里巴巴规范一直包Connection reset
原文：http://blog.51cto.com/11864647/2097248