先檢查jar包，jar包的地址如果不一樣需要remove后重新導入的，右鍵項目→Build Path。
看額外的jar包有沒有×，地址正不正確，要是不正確，remove錯誤jar包，再點擊Add Extenal JARs
最后檢查JDK的版本，當然是選自己電腦下載的版本了，點擊環境的下拉菜單。
要是還有錯誤的話，我也沒轍了，去看看別的教程吧。
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