Erro credenciais no Hibernate e MySQL?

Estou fazendo um programa em jpa está dando os seguintes erros

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version). log4j:WARN Please initialize the log4j system properly. Exception in thread “main” javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:630) at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:41) at com.exemplo.repositorio.RepositorioCliente.salvar(RepositorioCliente.java:20) at com.exemplo.testes.Teste.main(Teste.java:15) Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103) at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29) at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426) at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144) at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119) at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57) at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326) at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:38) … 2 more Caused by: java.sql.SQLException: Access denied for user ‘root’@‘localhost’ (using password: YES) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1056) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3376) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3308) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:894) at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3808) at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1256) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2032) at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:729) 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:406) at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:283) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110) at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423) … 7 more

<?xml version="1.0" encoding="UTF-8"?>
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"> 
org.hibernate.ejb.HibernatePersistence
        <!-- Conexão com o banco de dados -->
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
        <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
        <property name="hibernate.connection.url" value="jdbc:mysql://localhost/loja" />
         <property name="hibernate.connection.user" value="root"/>
           <property name="hibernate.connection.password" value="root" /> 

        <!--   <property name="hibernate.hbm2ddl.auto" value="create" /> --> 
         <property name="hibernate.hbm2ddl.auto" value="update"/>

        <!--Configuracoes de Debug-->
        <property name="hibernate.show_sql" value="true" />
        <property name="hibernate.format_sql" value="true" />
        <property name="use_sql_comments" value="true" />

    </properties>
</persistence-unit>