No suitable driver found

WARNING: SQL Error: 0, SQLState: 08001
SEVERE: No suitable driver found for jdbc:mysql://localhost:3306/horas
WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception
javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Cannot open connection
       at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1179)
       at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1112)
       at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1189)
       at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:63)
       at filters.JPAFilter.doFilter(JPAFilter.java:38)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
       at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
       at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
       at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
       at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
       at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
       at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
       at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
       at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
       at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
       at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
       at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
       at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
       at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
       at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
       at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
       at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
       at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
       at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
       at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
       at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
       at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
       at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
       at java.lang.Thread.run(Thread.java:722)
Caused by: org.hibernate.exception.JDBCConnectionException: Cannot open connection
       at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99)
       at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
       at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)
       at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)
       at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
       at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142)
       at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85)
       at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1463)
       at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:60)
       ... 26 more

package filters;

import java.io.IOException;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

@WebFilter(servletNames={"Faces Servlet"})
public class JPAFilter implements Filter{

	private EntityManagerFactory factory;
	
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		this.factory = Persistence.createEntityManagerFactory("horas-pu");
	}
	
	@Override
	public void destroy() {
		this.factory.close();		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		
		//CHEGADA
		EntityManager manager = this.factory.createEntityManager();
		request.setAttribute("EntityManager", manager);
		manager.getTransaction().begin();
		
		//FACES SERVLET
		chain.doFilter(request, response);
		
		//SAÍDA
		try{
			manager.getTransaction().commit();
		} catch (Exception e){
			manager.getTransaction().rollback();
		} finally {
			manager.close();
		}
		
	}
	
}