Problema ao conectar banco com JSF e Hibernate

GRAVE: Servlet.service() for servlet [Faces Servlet] in context with path [/projeto-jpa] threw exception [javax/persistence/Persistence] with root cause

java.lang.ClassNotFoundException: javax.persistence.Persistence

at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1358)

at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)

at com.algaworks.cadastrocliente.HibernateUtil.(HibernateUtil.java:13)

at com.algaworks.cadastrocliente.dao.GenericDAO.(GenericDAO.java:11)

at com.algaworks.cadastrocliente.dao.UsuarioDAO.(UsuarioDAO.java:5)

at com.algaworks.cadastrocliente.controller.UsuarioMB.(UsuarioMB.java:14)

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 java.lang.Class.newInstance(Unknown Source)

at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:186)

at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:100)

at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)

at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)

at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:257)

at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:117)

at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)

at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)

at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:94)

at org.apache.el.parser.AstValue.getValue(AstValue.java:137)

at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:190)

at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)

at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)

at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)

at javax.faces.component.UIOutput.getValue(UIOutput.java:174)

at javax.faces.component.UIInput.getValue(UIInput.java:293)

at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)

at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)

at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)

at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)

at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)

at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)

at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)

at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)

at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)

at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)

at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456)

at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)

at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)

at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)

at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)

at javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:688)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:609)

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

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)

<persistence-unit name="Clientes-PU">

<property name="hibernate.show_sql" value="true" />
        <property name="hibernate.format_sql" value="true" />
        
    </properties>
</persistence-unit>

import javax.persistence.EntityManager;

import javax.persistence.EntityManagerFactory;

import javax.persistence.Persistence;

public static EntityManagerFactory factory = null;

static {
	if (factory == null) {
		factory = Persistence.createEntityManagerFactory("Clientes-PU");
	}
}

public static EntityManager getEntityManager() {

	return factory.createEntityManager();
}

public static Object getPrimaryKey(Object entity) {

	return factory.getPersistenceUnitUtil().getIdentifier(entity);
}