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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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Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Access denied for user 'root '@'localhost' (using password: YES))
java.sql.SQLException: Access denied for user 'root '@'localhost' (using password: YES)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1086)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:928)	at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1750)	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1290)	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2502)	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2535)	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2320)	at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:834)	at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46)	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:416)	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347)	at java.sql.DriverManager.getConnection(Unknown Source)	at java.sql.DriverManager.getConnection(Unknown Source)	at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)	at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)	at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:153)	at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)	at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)	at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)	at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)	at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:80)	at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:66)	at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:271)	at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:69)	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:56)	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:259)	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:132)	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:104)	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:107)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:62)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:354)