我想从源代码制作一些类图，并想安装 objectaid，它是一个有助于生成 UML 图的 Eclipse 插件。
Help->Install new software->add->http://www.objectaid.net/update
它停留在 48% 并显示“正在获取...”，几个小时后它显示以下错误
An error occurred while collecting items to be installed
session context was:(profile=epp.package.java, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.bridge_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.dom_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.dom.svg_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.ext.awt_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.extension_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/features/org.apache.batik_1.6.0.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.parser_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.pdf_1.6.0.v201105071520.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.svggen_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.swing_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.transcoder_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.apache.batik.xml_1.6.0.v201011041432.jar
Connection timed out: connect
Unable to connect to repository http://www.objectaid.net/update/plugins/org.w3c.dom.smil_1.0.1.v200903091627.jar
Connection timed out: connect
有防火墙，我用goagent翻墙。