om.mysql.jdbc.CommunicationsException: Communications link failure

[esgoru]

hola buenas tengo este error no consigo instanciar la interfaz EntityManager siempre es null, uso tomcat y mysql, en un primer momento me da un java null pointer al acceder al EntityManager tras modificar alguna cala me data este error haber si me podeis echar un cable.

Código:

[main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - Hibernate connection pool size: 20
7204 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - autocommit mode: true
7204 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://localhost:3306/bankeveris
7204 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - connection properties: {user=root, password=****, autocommit=true, release_mode=auto}
8547 [main] WARN  org.hibernate.cfg.SettingsFactory  - Could not obtain connection metadata
com.mysql.jdbc.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2103)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:718)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:298)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)