Erro no Converter JSF

Boa noite.

Esta dando erro no meu converter, quando eu subo o meu sistema.

Erro

out 17, 2015 10:59:47 PM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [Faces Servlet] in context with path [/cortexWeb] threw exception [java.lang.Integer cannot be cast to model.UfEstado] with root cause
java.lang.ClassCastException: java.lang.Integer cannot be cast to model.UfEstado
	at converter.UfEstadoConverter.getAsString(UfEstadoConverter.java:27)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getFormattedValue(HtmlBasicRenderer.java:519)
	at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOption(MenuRenderer.java:533)
	at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:791)
	at com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:843)
	at com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:297)
	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
	at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:437)
	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124)
	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:139)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)

A minha classe

@FacesConverter(value="ufEstadoConverter")
public class UfEstadoConverter implements Converter{
	
	@Override
	public Object getAsObject(FacesContext arg0, UIComponent component, String id) {
		if(id == null){
			return this.getAttributesFrom(component).get(id);
		}
		return null;
	
	}
	@Override
	public String getAsString(FacesContext arg0, UIComponent component, Object value) {
		if (value != null && !"".equals(value)){
			UfEstado uf = (UfEstado)value;
			this.addAttribute(component, uf);
			Integer id_uf = uf.getId_uf();
		if (id_uf != null){
			return String.valueOf(id_uf);
			}
		}
		return (String) value;
	}
		 
	protected void addAttribute(UIComponent component, UfEstado estado){
		String key = Integer.toString(estado.getId_uf()); 
		this.getAttributesFrom(component).put(key, estado);
	}
	
	protected Map<String, Object> getAttributesFrom(UIComponent component){
		
		return  component.getAttributes();
	}
}  
<td><h:selectOneMenu id="seletc_uf"
value="#{ufEstadoBean.uf.id_uf}" converter="ufEstadoConverter">
							<f:selectItem itemValue="" itemLabel="Selecione..." />
							<f:selectItems var="ufs" value="#{ufEstadoBean.listaUfEstado}" />
						</h:selectOneMenu></td>

Obrigado pela ajuda.

Seu erro tah bem aqui

java.lang.Integer cannot be cast to model.UfEstado] with root cause
java.lang.ClassCastException: java.lang.Integer cannot be cast to model.UfEstado
at converter.UfEstadoConverter.getAsString(UfEstadoConverter.java:27)

Tah tentando converter um Inteiro para objeto UfEstado Da um Debugada com calma e olha os valores que estão sendo recebido pelo converter