Estou com seguinte erro na hora que vou rodar minha aplicação no Tomcat
exception
javax.servlet.ServletException javax.faces.webapp.FacesServlet.service(FacesServlet.java:659) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) root cause
java.lang.ExceptionInInitializerError br.com.caelum.livraria.dao.DAO.listaTodos(DAO.java:55) br.com.caelum.livraria.bean.LivroBean.getAutores(LivroBean.java:27) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) java.lang.reflect.Method.invoke(Unknown Source) javax.el.BeanELResolver.getValue(BeanELResolver.java:97) com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) org.apache.el.parser.AstValue.getValue(AstValue.java:169) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184) com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182) javax.faces.component.UISelectItems.getValue(UISelectItems.java:129) com.sun.faces.renderkit.SelectItemsIterator.initializeItems(SelectItemsIterator.java:208) com.sun.faces.renderkit.SelectItemsIterator.hasNext(SelectItemsIterator.java:135) com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:762) com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:847) com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:297) javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312) com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185) com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129) javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896) javax.faces.render.Renderer.encodeChildren(Renderer.java:176) javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899) com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:451) com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131) com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) root cause
javax.persistence.PersistenceException: No Persistence provider for EntityManager named livraria javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:61) javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39) br.com.caelum.livraria.dao.JPAUtil.(JPAUtil.java:10) br.com.caelum.livraria.dao.DAO.listaTodos(DAO.java:55) br.com.caelum.livraria.bean.LivroBean.getAutores(LivroBean.java:27) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) java.lang.reflect.Method.invoke(Unknown Source) javax.el.BeanELResolver.getValue(BeanELResolver.java:97) com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) org.apache.el.parser.AstValue.getValue(AstValue.java:169) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184) com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182) javax.faces.component.UISelectItems.getValue(UISelectItems.java:129) com.sun.faces.renderkit.SelectItemsIterator.initializeItems(SelectItemsIterator.java:208) com.sun.faces.renderkit.SelectItemsIterator.hasNext(SelectItemsIterator.java:135) com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:762) com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:847) com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:297) javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312) com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185) com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129) javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896) javax.faces.render.Renderer.encodeChildren(Renderer.java:176) javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899) com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:451) com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131) com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)