eclipse插件安装时因为是外网的原因很不稳定，时不时会出现Unable to read repository at http://*。jar Read timed out_myeclipse 插件unable to read repository at

eclipse安装插件出错时：弹出提示框时，点Detail，会显示例如以下类似错误信息：一般都是某个文件不能下载的原因：

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://downloads.genuitec.com/downloads/products/webclipse/updates/wc2017ci9/plugins/com.eclipsesource.j2v8.linux_x86_64_4.0.0.201606171358.jar.
Read timed out
Unable to read repository at http://downloads.genuitec.com/downloads/products/webclipse/updates/wc2017ci9/plugins/com.fasterxml.jackson.core.jackson-databind_2.5.0.v201504151636.jar.

Premature end of Content-Length delimited message body (expected: 1180012; received: 45805

例如：上面的两个原因是：http://downloads.genuitec.com/downloads/products/webclipse/updates/wc2017ci9/plugins/com.eclipsesource.j2v8.linux_x86_64_4.0.0.201606171358.jar与

http://downloads.genuitec.com/downloads/products/webclipse/updates/wc2017ci9/plugins/com.fasterxml.jackson.core.jackson-databind_2.5.0.v201504151636.jar不能下载成功，项此类问题的解决方法是：直接把上面的连接放入浏览器直接下载，或放入下载工具进行下载好。

再把下载好的文件放入eclipse的安装目录下的plugins文件夹下。再重新安装，问题就解决了。