com.mysql.jdbc.CommunicationsException

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Check if your server (or a proxy server) is not going up and down. There might be something between a proxy and a client sending intermittent requests to non-functioning hosts as well. There might as well be too many requests in a short amount of time.

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    • com.mysql.jdbc.CommunicationsException: Communications link failure Last packet sent to the server was 1 ms ago. at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2120) at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:723) at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:298) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at test.DBConnection.getConnection(DBConnection.java:56) at test.Test.main(Test.java:14) Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure Last packet sent to the server was 0 ms ago. at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070) at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:335) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2043) ... 7 more Caused by: java.net.ConnectException: Connection refused: connect at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.PlainSocketImpl.doConnect(Unknown Source) at java.net.PlainSocketImpl.connectToAddress(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.<init>(Unknown Source) at java.net.Socket.<init>(Unknown Source) at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253) at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:284) ... 8 more

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