Eclipse错误：此项目需要迁移WTP元数据

Question

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.

Answer 1

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.

Answer 2

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

/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/myprojectname/.markers

Answer 3

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.

Answer 4

try adding this line in the .project file

<nature>org.eclipse.wst.common.project.facet.core.nature</nature>

Or refer to this discussion : for instance, make sure there is no duplicate entries in .sessions/org.eclipse.wst.common.component

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As noted in the comment by larf311 , the actual answer in this instance was:

delete the " .settings/org.eclipse.wst.common.component " file.

Simple. ;)

Answer 5

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. :(

Answer 6

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

Answer 7

删除项目，并将其从源代码管理中检出

Answer 8

我使用SVN，每次在新计算机上签出项目时我都有这个问题，我修复的方法是将.settings从原始位置复制到项目的新文件夹，当然使用验证

Answer 9

使用maven ... mvn eclipse：clean ... mvn eclipse：eclipse ...重新导入项目

Answer 10

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.