I tried Marco's steps but no luck. Instead if you just get the latest m2e plugin from the link he provides and one by one right click on each project -> Maven -> Update Dependencies the error still pops up but the issue is resolved. That is to say the warnings disappear in the Markers view. I encountered this issue after importing some projects into SpringSource Tool Suite (STS). When I returned to my Eclipse Juno installation the warnings were displaying. Seeing that I had m2e 1.1 already installed I tried Marco's steps to no avail. Getting the latest version fixed it however.

I tried Marco's steps but no luck. Instead if you just get the latest m2e plugin from the link he provides and one by one right click on each project -> Maven -> Update Dependencies the error still pops up but the issue is resolved. That is to say the warnings disappear in the Markers view. I encountered this issue after importing some projects into SpringSource Tool Suite (STS). When I returned to my Eclipse Juno installation the warnings were displaying. Seeing that I had m2e 1.1 already installed I tried Marco's steps to no avail. Getting the latest version fixed it however.

你有没有试过:

如果您有导入项目到eclipse 4，请删除它。 在maven consol中，运行:mvn eclipse:clean Eclipse 4: File -> Import -> Maven ->现有Maven项目

右键单击项目，选择Maven -> Remove Maven Nature。 打开你的终端，进入你的项目文件夹，执行mvn eclipse:clean 右键单击您的项目，选择“配置->转换为Maven项目”

现在你的“Unsupported IClasspathEntry kind=4 Eclipse Scala”消失了。

我使用Eclipse 4.3.2 (Kepler)和M2E 1.4。X和摸索了好几次这个问题!

在我的情况下，“mvn eclipse:eclipse”命令还生成Checkstyle, PMD和Findbugs配置，所以“mvn eclipse:clean”对我没有帮助，因为它会再次删除所有这些配置文件。

对我来说，最好的解决办法就是删除所有。”类路径”文件:

find . -name ".classpath" -delete

然后将项目导入eclipse。

确保您正在运行的m2e(clipse)插件的版本至少为1.1.0 关闭maven项目-右键单击“关闭项目” 手动删除。classpath文件中所有带有kind="var"的classpathentry 开放项目

or

删除maven项目 手动清除.classpath 4再导入项目