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

The last packet successfully received from the server was 2??688??918 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago.
16:20:02 [SEVERE] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
16:20:02 [SEVERE] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
16:20:02 [SEVERE] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
16:20:02 [SEVERE] at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
16:20:02 [SEVERE] at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
16:20:02 [SEVERE] at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)
16:20:02 [SEVERE] at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3562)
16:20:02 [SEVERE] at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3462)
16:20:02 [SEVERE] at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3905)
16:20:02 [SEVERE] at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
16:20:02 [SEVERE] at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
16:20:02 [SEVERE] at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2491)
16:20:02 [SEVERE] at com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1552)
16:20:02 [SEVERE] at com.mysql.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2607)
16:20:02 [SEVERE] at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1480)
16:20:02 [SEVERE] at pl.kopara.auth.mysql.MySQL.executeUpdate(MySQL.java:73)
16:20:02 [SEVERE] at pl.kopara.auth.data.Auth$5.run(Auth.java:130)
16:20:02 [SEVERE] at net.md_5.bungee.scheduler.BungeeTask.run(BungeeTask.java:63)
16:20:02 [SEVERE] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
16:20:02 [SEVERE] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
16:20:02 [SEVERE] at java.lang.Thread.run(Thread.java:748)
16:20:02 [SEVERE] Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
16:20:02 [SEVERE] at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3014)
16:20:02 [SEVERE] at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3472)
16:20:02 [SEVERE] ... 14 more