今天因为工作需要打算在Eclipse上安装一下Eclipse RCP Plugin-in Developer Resource 3.7.2的插件，照常使用Eclipse自带的最方便的“Install New Software”如图。
结果报错说Cannot complete the install because of a conflicting dependency.
笔者已经安装了3.6版本的RCP Developer Plugin，所以和想要安装的3.7版本产生了冲突。笔者个人认为Eclipse这一点是比较弱的，理想情况下应该询问是否需要从3.6升级到3.7，Eclipse没有这样做，而是提供了专门的升级功能，在Help-->Check
For Updates。
点击Check For Updates，又遇到新的问题说
Some sites could not be found. See the error log for more detail.
No repository found at http://download.eclipse.org/tools/emf/updates/.
No repository found at http://subclipse.tigris.org/update_1.5.x.
No repository found at http://download.eclipse.org/tools/orbit/downloads/drops/R20100519200754/repository.
No repository found at http://www.eclipse.org/modeling/emf/downloads/.
这是因为有些repository (代码仓库) 不是永久性的，有些当初安装插件的地址可能已经失效，而Eclipse的升级功能是查看所有地址的插件，和本地插件版本相比对，来判断是否需要升级。解决方法是，打开Help-->Install New Software，然后打开所有的available sites。笔者手动删掉了上面错误提示中说找不到仓库的4个地址。
然后重新Check For Updates，果然找到了3.7.2版本的Eclipse Platform，选中并进行升级。
完成后重启Eclipse，如此便完成了Eclipse插件升级。
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