Eclipse：An error has occurred. See error log for more details. java.lang.NullPointerException

在使用 Eclipse Clean 项目时报错：An error has occurred. See error log for more details. java.lang.NullPointerException。猜测这应该是由于 Eclipse 没有正常关闭所导致的。

打开 Eclipse 的日志 workspace.metadata.log 查看

删除当前项目，注意不要把这个勾选上：Delete project contents on disk（cannot be undone）
重新导入项目，Project —> Clean... 一下工程就可以了

其他办法：

Try so start Eclipse from the console/terminal with the -clean option.

On Windows:

Eclipse.exe -clean

On Linux/Unix:

./eclipse -clean

or if Eclipse is in your PATH

eclipse -clean

This will clear your plug-ins cache, maybe it solves the issue.