[英]UnknownHostException is thrown while connecting to a valid ip port
[英]UnknownHostException: while connecting to database server
我正在嘗試在1nd1.com上托管MySQL數據庫。 我創建了一個只有幾個表的數據庫。 從Java應用程序連接到1and1數據庫時出現以下錯誤。
使用“ ping hostname”命令從命令提示符執行ping操作時,響應失敗。
有什么方法可以從Java程序連接到該主機嗎?
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.UnknownHostException
MESSAGE: db726853948.db.1and1.com
STACKTRACE:
java.net.UnknownHostException: db726853948.db.1and1.com
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:907)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1302)
at java.net.InetAddress.getAllByName0(InetAddress.java:1255)
at java.net.InetAddress.getAllByName(InetAddress.java:1171)
at java.net.InetAddress.getAllByName(InetAddress.java:1105)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:246)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:271)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2771)
at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at Contct.insertDetails(Contct.java:11)
at Contct.main(Contct.java:28)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
嘗試將主機名添加到主機文件
例如:
your_host_ip(122.2.2.1) hostname(db726853948.db.1and1.com)
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