报错：
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://download.eclipse.org/efxclipse/updates-released/2.4.0/site/plugins/org.eclipse.fx.ide.rrobot.dsl_2.4.0.201605112122.jar.
Premature end of Content-Length delimited message body (expected: 1179097; received: 1162761
报错原因：
网络问题
解决：
1.根据报错提示到网站（标红位置）离线下载XXXjar包
2.将下载jar包解压到eclipse 的plugins文件夹
3.重启eclipse，重新下载