1.eclipse非正常关机启动不起来

eclipse项目报空指针异常，可以不用全部删除.metadata文件，只删除.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi文件

2.eclipse清空项目缓存

Eclipse won't launch because `reload maven project has encountered a problem

Instead of deleting the whole .metadata folder, just delete the file .metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi" You need to make sure to quit eclipse first, then remove this file and start eclipse again.

.metadata\.plugins\org.eclipse.core.resources\.projects该文件夹缓存了所有的项目