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

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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.