Problems encountered while deleting resources. Could not delete 'D:\workspace\jiekou\jiekou\WebRoo

報錯背景： lib下面有一個jar包不用的，我想把它刪除， 我關閉了tomcat，但是還是刪除不掉   Problems encountered while deleting resources.   Could not delete 'D:\workspace\jiekou\jiekou\WebRoot\WEB-INF\lib\commons-lang-2.3.jar'. 怎麼刪除這個lib包呢

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