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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.

Solutions on the web

via java-samples.com by Unknown author, 2 years ago
Access denied for user ''@'localhost' (using password: NO )
via java-samples.com by Unknown author, 1 year ago
Access denied for user ''@'localhost' (using password: NO )
via netbeans.org by Unknown author, 2 years ago
Access denied for user 'root'@'localhost' (using password: YES)
via Stack Overflow by Newbie
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Access denied for user 'adminSKr7Tbz'@'localhost' (using password: YES)
via Oracle Community by 843859, 1 year ago
Access denied for user 'novajobs_user'@'adsl-75-57-156-108.dsl.emhril.sbcglobal.net' (using password: YES)
via Stack Overflow by Unknown author, 2 years ago
Access denied for user 'myuser'@'myHost' (using password: YES)
java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO
)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3491)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3423)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:910)	at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3923)	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1273)	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2031)	at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:718)	at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)	at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)	at java.sql.DriverManager.getConnection(DriverManager.java:582)	at java.sql.DriverManager.getConnection(DriverManager.java:207)