An internal error occurred during: "Importing Maven projects". 错误

An internal error occurred during: “Importing Maven projects”. 错误

An internal error occurred during: “Importing Maven projects”.
Unsupported IClasspathEntry kind=4

今天用eclipse把非maven项目转换为maven项目后，爆出如上错误。

在stackoverflo网站看到类似的问题

http://stackoverflow.com/questions/10564684/how-to-fix-error-updating-maven-project-unsupported-iclasspathentry-kind-4
解决方法：

In order to fix this problem, you need to do the following:

Make sure that the version of the m2e(clipse) plugin that you’re running is at least 1.1.0, and preferably, the latest available. The update site is the following url: http://eclipse.org/m2e/download/.

Disable the maven nature for the project (via the right-click menu)

run mvn eclipse:clean (while your project is open in STS/eclipse). Depending on the timing, you might need to do a refresh or two on the project before re-enabling the maven nature. You should be able to see that your project has lost it’s Java or other facets.

re-enable the maven nature.
(Most of the time, this can be done by right-clicking on the project in question in the package explorer pane, and then choosing ‘Configure’-> ‘Convert to Maven Project’)

翻译成中文：

1，确保你的m2e插件是最新的且可用的，至少要1.1以上的版本。

2，先让这个maven工程转换为非maven工程。方法：右键工程–maven–Disable maven nature

3，在当前目录下执行命令（就是有pom.xml文件的那个目录） —— mvn eclipse:clean

4，重新转换该工程为maven工程。右键工程— ‘Configure’— ‘Convert to Maven Project’