• 驱动注册成功 com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION ** java.net.Conn


    驱动注册成功
    com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

    ** BEGIN NESTED EXCEPTION **

    java.net.ConnectException
    c

    STACKTRACE:

    java.net.ConnectException: Connection refused: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:529)
    at java.net.Socket.connect(Socket.java:478)
    at java.net.Socket.<init>(Socket.java:375)
    at java.net.Socket.<init>(Socket.java:218)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
    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:582)
    at java.sql.DriverManager.getConnection(DriverManager.java:185)
    at com.bn.ex12k.jdbcUtil.getConnection(jdbcUtil.java:82)
    at com.bn.ex12k.Test.main(Test.java:16)


    ** END NESTED EXCEPTION **

    Last packet sent to the server was 1 ms ago.
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2847)
    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:582)
    at java.sql.DriverManager.getConnection(DriverManager.java:185)
    at com.bn.ex12k.jdbcUtil.getConnection(jdbcUtil.java:82)
    at com.bn.ex12k.Test.main(Test.java:16)
    Exception in thread "main" java.lang.NullPointerException
    at com.bn.ex12k.jdbcUtil.updateDB(jdbcUtil.java:96)
    at com.bn.ex12k.Test.main(Test.java:22)

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  • 原文地址:https://www.cnblogs.com/tfy1332/p/3655783.html
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