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HTTP Status 500 - com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

type Exception report

message com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.RuntimeException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.        control.Control.doGet(Control.java:72)        control.Control.doPost(Control.java:101)        javax.servlet.http.HttpServlet.service(HttpServlet.java:648)        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

root cause

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.        sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)        sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)        java.lang.reflect.Constructor.newInstance(Unknown Source)        com.mysql.jdbc.Util.handleNewInstance(Util.java:425)        com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:989)        com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)        com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2192)        com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2225)        com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2024)        com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:779)        com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)        sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)        sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)        java.lang.reflect.Constructor.newInstance(Unknown Source)        com.mysql.jdbc.Util.handleNewInstance(Util.java:425)        com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)        com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)        java.sql.DriverManager.getConnection(Unknown Source)        java.sql.DriverManager.getConnection(Unknown Source)        model.Dao.connect(Dao.java:24)        model.Dao.insertlist(Dao.java:88)        control.Control.doGet(Control.java:68)        control.Control.doPost(Control.java:101)        javax.servlet.http.HttpServlet.service(HttpServlet.java:648)        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

root cause

java.net.ConnectException: Connection refused: connect        java.net.DualStackPlainSocketImpl.connect0(Native Method)        java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)        java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)        java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)        java.net.AbstractPlainSocketImpl.connect(Unknown Source)        java.net.PlainSocketImpl.connect(Unknown Source)        java.net.SocksSocketImpl.connect(Unknown Source)        java.net.Socket.connect(Unknown Source)        com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)        com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)        com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2192)        com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2225)        com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2024)        com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:779)        com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)        sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)        sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)        java.lang.reflect.Constructor.newInstance(Unknown Source)        com.mysql.jdbc.Util.handleNewInstance(Util.java:425)        com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)        com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)        java.sql.DriverManager.getConnection(Unknown Source)        java.sql.DriverManager.getConnection(Unknown Source)        model.Dao.connect(Dao.java:24)        model.Dao.insertlist(Dao.java:88)        control.Control.doGet(Control.java:68)        control.Control.doPost(Control.java:101)        javax.servlet.http.HttpServlet.service(HttpServlet.java:648)        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)