1、在安装CheckStyle过程中，安装到48%时不动了，如图
2、随后就弹出报错提示窗口
3、详情如下
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 http://sevntu-checkstyle.github.com/sevntu.checkstyle/update-site/plugins/eclipsecs-sevntu-plugin_1.10.0.jar.
Read timed out