com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 1,392,390,324,572 milliseconds ago.  The last packet sent successfully to the server was 0 milliseconds ago.

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    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
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    Help!

    GitHub | 4 years ago | CraftyMcloving
    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link fai lure The last packet sent successfully to the server was 0 milliseconds ago. The driv er has not received any packets from the server.
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    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link fai lure Last packet sent to the server was 0 ms ago.
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  5. 0

    MySQL communication link failure

    Stack Overflow | 2 years ago
    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
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    Failed to connect to MySQL database

    Stack Overflow | 2 years ago
    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 1 432 637 479 787 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago. Failed to connect to MySQL database

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Root Cause Analysis

  1. java.net.ConnectException

    Connection refused: connect

    at java.net.PlainSocketImpl.socketConnect()
  2. Java RT
    Socket.<init>
    1. java.net.PlainSocketImpl.socketConnect(Native Method)
    2. java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
    3. java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
    4. java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
    5. java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    6. java.net.Socket.connect(Socket.java:519)
    7. java.net.Socket.connect(Socket.java:469)
    8. java.net.Socket.<init>(Socket.java:366)
    9. java.net.Socket.<init>(Socket.java:209)
    9 frames
  3. MySQL jdbc
    JDBC4Connection.<init>
    1. com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
    2. com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:290)
    3. com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2137)
    4. com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:773)
    5. com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
    5 frames
  4. Java RT
    Constructor.newInstance
    1. sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    2. sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    3. sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    4. java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    4 frames
  5. MySQL jdbc
    NonRegisteringDriver.connect
    1. com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    2. com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:352)
    3. com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
    3 frames
  6. Java RT
    DriverManager.getConnection
    1. java.sql.DriverManager.getConnection(DriverManager.java:582)
    2. java.sql.DriverManager.getConnection(DriverManager.java:185)
    2 frames
  7. dbutil
    DBUtils.main
    1. dbutil.DBUtils.getConnection(DBUtils.java:38)
    2. dbutil.DBUtils.main(DBUtils.java:59)
    2 frames