blocks|key|351370|text|上面的解决方案工作得很好，但它一次又一次地出现问题。一种更简单的解决方案是在Eclipse中右键单击相关项目并选择Validate。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|351371|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The above solution works fine but it creeps up again and again. An easier solution is to right click on the concerned project in Eclipse and choose Validate.

blocks|key|354106|text|对我来说，这些都不管用。我的解决方案是在Eclipse停止时删除以下文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|354107|/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/myprojectname/.markers|code-block|syntax|javascript|354108|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For me, none of these worked.
The solution for me was deleting the following file while Eclipse was stopped:

<pre><code>/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/myprojectname/.markers
</code></pre>

blocks|key|349099|text|这是你可以尝试的另一件事，只是这个对我有效:(|type|unstyled|depth|inlineStyleRanges|entityRanges|data|349100|转到项目属性>项目方面>勾选"Java“和"Utility+Module”...apply如果你的项目被其他项目引用，你可以使用这些选项..otherwise+...see，其中一个对你有效。|349101|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Here is another thing you could try, only this worked for me :( 

Go to project properties > Project facets > there tick "Java" and "Utility Module" ... apply
This works if your project is referenced from other projects ..otherwise you could play with those options ...see which one works for you.

blocks|key|3343517|text|尝试在.project文件中添加此行|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3343518|<nature>org.eclipse.wst.common.project.facet.core.nature</nature>|code-block|syntax|javascript|3343519|或者参考this+discussion：例如，确保.sessions/org.eclipse.wst.common.component中没有重复的条目|3343520|3343521|正如larf311在评论中指出的那样，这种情况下的实际答案是：|3343522|3343523|删除".settings/org.eclipse.wst.common.component“文件。|blockquote|3343524|3343525|3343526|很简单。;)|3343527|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ibm.com/developerworks/forums/thread.jspa?threadID=141106|1|https://stackoverflow.com/users/31169/larf311^0|3|8|0|0|P|16|4|F|0|0|0|2|7|1|0|0|3|16|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|M|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1I|8|@]|D|@$9|1J|A|1K|1|1L]]|E|$]]|$1|P|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]|$1|Q|3|R|5|S|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]|$1|V|3|W|5|6|7|1S|8|@]|D|@]|E|$]]|$1|X|3|-4|5|6|7|1T|8|@]|D|@]|E|$]]]|Y|$Z|$5|10|11|12|E|$13|14]]|15|$5|10|11|12|E|$13|16]]]]

try adding this line in the <code>.project</code> file

<pre><code>&lt;nature&gt;org.eclipse.wst.common.project.facet.core.nature&lt;/nature&gt;
</code></pre>

Or refer to <a href="http://www.ibm.com/developerworks/forums/thread.jspa?threadID=141106" rel="nofollow noreferrer">this discussion</a>: for instance, make sure there is no duplicate entries in <code>.sessions/org.eclipse.wst.common.component</code>

<hr>

As noted in the comment by <a href="https://stackoverflow.com/users/31169/larf311">larf311</a>, the actual answer in this instance was:

<blockquote>
 delete the "<code>.settings/org.eclipse.wst.common.component</code>" file.
</blockquote>

Simple. ;)

blocks|key|3343573|text|删除.markers文件为我解决了这个问题。我会支持这个解决方案，除非我没有这样做的“声誉”。:(|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3343574|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Removing the .markers file resolved this issue for me. I would upvote that solution, except that I don't have the "reputation" to do so. :(

blocks|key|3343692|text|这仅仅意味着wtp的项目配置是旧的，或者模块之间存在冲突。转到项目->properties+->项目方面。然后点击:+dynamic+web+project+ver2.5，java5或6和javascript+toolkit+(不确定是否有必要)。您将注意到对.settings文件进行了更改。签入新的更改，每次有人签出项目时都应该没问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3343693|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

This just means that the project configuration of wtp are old, or there's a conflict between modules. go to Projct ->properties -> project facets. Then click the following: dynamic web project ver 2.5, java 5 or 6 and javascript toolkit (not sure if its necessary). You will notice that there have been changes to .settings file. check in the new changes, and everytime someone checks out the project it should be okay

blocks|key|351405|text|删除项目，并将其从源代码管理中签出|type|unstyled|depth|inlineStyleRanges|entityRanges|data|351406|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Delete the project, and check it out of source control

blocks|key|3130816|text|我使用SVN，每次我在一台新计算机上签出项目时，我都会遇到这个问题，我修复的方法是将.settings从原始位置复制到项目的新文件夹中，当然使用验证|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3130817|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I use SVN and every time I checkout the project in a new computer I have this problem, the way I fixed is to copy the .settings from the original location to the new folder of the project, of course use validation

blocks|key|354179|text|使用maven+...mvn+eclipse:干净...mvn+eclipse:eclipse+...重新导入项目|type|unstyled|depth|inlineStyleRanges|entityRanges|data|354180|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Use maven ... mvn eclipse:clean ... mvn eclipse:eclipse ... reimport the project

blocks|key|3343704|text|在项目的Properties中，我选择了project+Facets。没有选择，但在右侧有一条消息，指示需要选择Java+1.3或更高版本。我选择了Java+6，然后在关闭Properties窗口之后，我仍然需要做一个“验证”。这个问题终于消失了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3343705|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In the Properties for the project I selected Project Facets. None were selected, but there was a message on the right hand side indicating that Java 1.3 or later needed to be selected. I selected Java 6 and then after closing the Properties window I still had to do a "Validate". The problem finally disappeared.

We started a Web Project in Eclipse 3.2 a ways back and we've since upgraded to Eclipse 3.4 but now the Project has the error:

"This project needs to migrate WTP metadata"

We've tried right-clicking and doing the "quick-fix" which is in fact to Migrate WTP Metadata. Unfortunately nothing happens and the error remains. 

We can delete that error from the Problems and everything works as it should, however, every time we re-import the project from source control, the error re-appears. Any ideas on how to permanently get rid of this error or how to ACTUALLY migrate WTP metadata?

UPDATE: Everyone, please vote on the answer that works for you rather than adding your own answer that references a previous person's answer.

Eclipse error: This project needs to migrate WTP metadata

Eclipse

Java

我们在Eclipse 3.2中启动了一个Web项目，后来升级到了Eclipse 3.4，但现在该项目出现了以下错误：“此项目需要迁移WTP元数据”我们已经尝试了右键单击并执行“快速修复”，这实际上是为了迁移WTP元数据。不幸的是，什么都没有发生，错误仍然存在。我们可以从问题中删除该错误，一切都会正常工作，但是，每次我们从源代码管理中重新导入项目时，该错误都会再次出现。关于如何永久摆脱此错误或如何实

问Eclipse错误:此项目需要迁移WTP元数据
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