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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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Access denied for user 'username'@'localhost' (using password: YES)
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Access denied for user ********* (using password: YES)
via Stack Overflow by Kadenge Gungwa
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java.sql.SQLException: Access denied for user 'username'@'localhost' (using password: YES)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:963)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:875)	at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1712)	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1228)	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253)	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284)	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083)	at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:806)	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:404)	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)	at java.sql.DriverManager.getConnection(Unknown Source)	at java.sql.DriverManager.getConnection(Unknown Source)	at com.simpleWebApplication.servlet.RegisterServlet.doPost(RegisterServlet.java:47)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Unknown Source)