我在eclipse中单击更新并且出现错误，这是因为我不止一次更新了eclipse。有没有办法修复eclipse并有能力使用更新？
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答案 0 :(得分：34)
您使用的是什么版本的日食？
一直是fixed in 3.4.1，但在您的情况下，可能是this bug instead。
事实证明原因是一个或多个工件存储库从已知存储库列表中丢失。
解决方法是从列表中删除存储库并再次将其添加回来。这将恢复缺少的工件存储库。
eclipse 3.4.1中可能的解决方法：
1）将更新网站列表导出到bookmarks.xml文件（Software Updates->Manage sites->Export）
2）停止日食
3）删除configuration/.settings/org.eclipse.equinox.p2.*.prefs个文件
（注意，正如评论中Fredrik所述）对于Eclipse3.5 +，这将是：
p2\org.eclipse.equinox.p2.engine\.settings
p2\org.eclipse.equinox.p2.engine\profileRegistry\SDKProfile.profile\.data\.settings）
4）开始日食
5）导入在步骤1中导出的bookmarks.xml文件（Software Updates->Manage sites->Import）
正如mark（此问题的作者）在本回答的评论中提到的那样，该解决方案是解决他的问题的方法。
其他建议：
[...]解决方案始终是在我的P2 UI中将
'/'追加到所有存储库URL。
我的感觉是，这个错误是由于未能为repo资源构建可行的URL造成的。有问题的代码不是检查来自UI的URL字符串，而是假设一个尾随'/'导致404
最后一个解决方案已经在Eclipse Indigo和Juno中得到确认（在评论中如下）。
答案 1 :(得分：11)
又一个解决方案 -
而是导出所有托管网站并将其导回， 点击每个选中网站上的“修改”，然后在结尾添加“//”
如果您只是添加'/'，则表示重复的网站，因此是'//'
如何在一个巨大的精心设计的应用程序中的小错误 可能很难调试但很难解决
答案 2 :(得分：3)
虽然很长一段时间回答了这个问题，但想分享一下我的经验，认为它可以节省一些时间：）
有些时候，由于代理设置不正确，也有可能。在我的例子中（Eclipse 3.6 / Helios），Eclipse首选项文件$ECLIPSE_HOME$/configuration/.settings/org.eclipse.core.net.prefs具有代理详细信息，
proxyData/HTTP/hasAuth=true
systemProxiesEnabled=true
proxyData/HTTP/host=proxy.domain.net
org.eclipse.core.net.hasMigrated=true
eclipse.preferences.version=1
proxiesEnabled=true
proxyData/HTTP/port=9119
nonProxiedHosts=
当我关闭Eclipse后删除文件时，我可以下载插件
答案 3 :(得分：2)
我在Ubuntu 64位上遇到了与Eclipse Helios（3.6）相同的问题。
删除
http://download.eclipse.org/tools/cdt/releases/helios
来自Eclipse中的“可用软件站点”，并再次添加它进行了修复。
答案 4 :(得分：1)
我遇到了同样的问题（和我刚刚尝试安装subclipse的情况类似）。 VonC的提示“其他建议”为我做了。
答案 5 :(得分：1)
导出的书签文件中的反斜杠功能为我修复了它。
答案 6 :(得分：0)
我遇到了同样的问题。 导出和导入书签后，问题无法解决。 但我开始收到错误'Connection refused'。
进一步的想法我发现我的防病毒软件不允许eclipse与互联网通信。禁用防病毒功能使其正常工作。
Sandeep Jindal
答案 7 :(得分：0)
在过去的几个月里，我遇到了类似的问题，但是在我今天真的需要PyDev在我的笔记本电脑上工作之前就忽略了它。
我尝试上面的解决方案无济于事，然后我发现了一些奇怪的东西：
在（窗口 - ＆gt;偏好设置 - ＆gt;安装/更新 - ＆gt;可用软件）中，我注意到“PyDev更新站点”的框和另一个位于其下方且位置为“file：/ updates”的框都是选中，导致大多数或所有更新网址重复。取消选中位置'file：/ updates'的复选框后，我可以从（帮助 - >检查更新）更新，然后成功安装了最新版本的PyDev。
此解决方案可能不仅适用于PyDev更新，并且可能有助于其他类似问题。
答案 8 :(得分：0)
我遇到了同样的问题，我在ZoneAlarm防火墙上打了一针，连接好了！
我需要在防火墙中添加某种规则以阻止它阻止eclipse吗？它从来没有这样做过，一切都在工作，直到上周（2012年9月25日（ish））
答案 9 :(得分：0)
当我遇到类似的问题时，我将以下存储库添加到我的可用更新站点。 http://dist.springsource.com/release/TOOLS/update/e4.4/
确保网址末尾有斜杠。
答案 10 :(得分：0)
这个问题有一个简单的解决方案，我在https://marketplace.eclipse.org/content/ibm-websphere-mq-explorer/login-warning上测试过，只需安装＆＃34; Eclipse Tests，Examples和Extras＆＃34; - ＆GT; ＆＃34; Eclipse 2.0样式插件支持＆＃34;来自Eclipse Project Updates存储库