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  1. ,
    Expert tip

    MySQL doesn't support some types of characters (such as emojis) with the utf8 encoding. You need to be on MySQL 5.5+ and force utf8mb4 (everywhere, client and server). You can do this sending the query "SET NAMES utf8mb4". Check this https://goo.gl/3E2qzg

  2. ,

    Make sure you are using InnoDB storage engine and READ-COMMITTED transaction isolation level and increase the database server innodb_lock_wait_timeout variable to about 500.

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java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:943)	at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4113)	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1308)	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2336)	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)	at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:792)	at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)	at java.lang.reflect.Constructor.newInstance(Unknown Source)	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)	at java.sql.DriverManager.getConnection(Unknown Source)	at java.sql.DriverManager.getConnection(Unknown Source)	at main.main.main(main.java:22)