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.

Ask Ubuntu | ggeo | 1 year 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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    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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    JDBC + MYSQL Communications 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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    Stack Overflow | 1 year ago | master
    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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    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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Root Cause Analysis

  1. java.net.ConnectException

    Connection refused: connect

    at java.net.DualStackPlainSocketImpl.connect0()
  2. Java RT
    Socket.connect
    1. java.net.DualStackPlainSocketImpl.connect0(Native Method)
    2. java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    3. java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    4. java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    5. java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    6. java.net.PlainSocketImpl.connect(Unknown Source)
    7. java.net.SocksSocketImpl.connect(Unknown Source)
    8. java.net.Socket.connect(Unknown Source)
    8 frames
  3. MySQL jdbc
    JDBC4Connection.<init>
    1. com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:213)
    2. com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:297)
    3. com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2237)
    4. com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2270)
    5. com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2069)
    6. com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)
    7. com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
    7 frames
  4. Java RT
    Constructor.newInstance
    1. sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    2. sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    3. sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    4. java.lang.reflect.Constructor.newInstance(Unknown Source)
    4 frames
  5. MySQL jdbc
    NonRegisteringDriver.connect
    1. com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
    2. com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
    3. com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
    3 frames
  6. Java RT
    DriverManager.getConnection
    1. java.sql.DriverManager.getConnection(Unknown Source)
    2. java.sql.DriverManager.getConnection(Unknown Source)
    2 frames
  7. server
    UploadData.main
    1. server.UploadData.main(UploadData.java:32)
    1 frame