連線資料庫Oracle12c異常解決：Connections could not be acquired from the underlying database
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
之前本地使用的oracle11g，結果伺服器上來了一個Oracle12c，瞬間就連不上了，害得我花費了好幾天時間。
具體解決方案如下：
首先ping 或者telnet資料庫看是否是通的，如果不通那累死也連不上呢。
其次確認驅動版本，儘量使用6以上版本
最後確認資料庫連線寫法，正確寫法為：jdbc:oracle:thin:@//127.0.0.1:1521/orcl
然後再次嘗試
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