今天在导入maven工程中遇到一错误，An internal error occurred during: "Updating Maven Project". > Unsupported IClasspathEntry kind=4
解决办法：
Right-click on your project, select Maven -> Disable Maven Nature.
Open you terminal, go to your project folder and do “mvn eclipse:clean”
Right click on your Project and select “Configure -> Convert into Maven Project”
Maven Unsupported IClasspathEntry kind=4
原文：http://www.cnblogs.com/bpynfy/p/5915752.html