Java compiler level does not match the version of the installed Java project facet

編譯java工程出現錯誤：Java compiler level does not match the version of the installed Java project facet 是版本不一致的問題，查看java path沒有問題，一樣的jre。不解。Google 搜索 問題一： 問：項目圖標報錯，Problems 試圖有一條錯誤顯示「Java compiler level does

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