Campos do formulario somem ao dar update no form

Pessoal,
Preciso de uma ajuda num formulario de cadastro onde meu campo cep preenche automaticamente outros campos do tipo: bairro, UF e logradouro. Mas quando tento gravar e acontece algum erro de validação no campo de confirmação de senha, esses campos que estavam preenchidos ficam em branco. O que pode estar errado? Como posso mante-los preenchidos mesmo com atualização da página através do update?
Segue me codigo do XHTML

<p:panel toggleable="true" header="Endereço Cliente">

				<h:panelGrid id="gridCep" columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.cep']}" for="cep" /> 
	            		<p:inputText id="cep" value="#{cadastroClientePFBean.cep.numCep}"  required="true" requiredMessage="#{msgs['campo.obrigatorio']}"
	            					  maxlength="8" tabindex="3">
	            					 <p:ajax event="blur" listener="#{cadastroClientePFBean.recuperarCep}" 
	            					 		 update="logradouro, bairro, cidade, uf, mensagemCep"/>
	            		</p:inputText>
						<p:message id="mensagemCep" for="cep" /> 
				</h:panelGrid>
			
				
				<h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.logradouro']}" for="logradouro" /> 
	            		<p:inputText id="logradouro" required="true" value="#{cadastroClientePFBean.cep.nomeLogradouro}" 
	            					 readonly="true" immediate="true" requiredMessage="#{msgs['campo.obrigatorio']}"/>
						<p:message for="logradouro" /> 
				</h:panelGrid>
				
				<h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.numero']}" for="numero" /> 
	            		<p:inputText id="numero"  
	            					 value="#{cadastroClientePFBean.endereco.numeroLogradouro}" maxlength="20" tabindex="4"/>
						<p:message for="numero" /> 
				</h:panelGrid>
				 
				 <h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.complemento']}" for="complemento" /> 
	            		<p:inputText id="complemento"
	            					 value="#{cadastroClientePFBean.endereco.complemento}" maxlength="40" tabindex="5"/>
						<p:message for="complemento" /> 
				</h:panelGrid>
				
				<h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.bairro']}" for="bairro" /> 
	            		<p:inputText id="bairro" required="true" readonly="true" 
	            					 value="#{cadastroClientePFBean.cep.bairroinicial.nomebairro}" requiredMessage="#{msgs['campo.obrigatorio']}"/>
						<p:message for="bairro" /> 
				</h:panelGrid>
				
				<h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.cidade']}" for="cidade" /> 
	            		<p:inputText id="cidade" required="true" readonly="true" requiredMessage="#{msgs['campo.obrigatorio']}"
	            					 value="#{cadastroClientePFBean.cep.bairroinicial.localidade.nomeLocalidade}"/>
						<p:message for="cidade" /> 
				</h:panelGrid>
				
				<h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.uf']}" for="uf" /> 
	            		<p:inputText id="uf" required="true" readonly="true" requiredMessage="#{msgs['campo.obrigatorio']}"
	            					 value="#{cadastroClientePFBean.cep.bairroinicial.localidade.uf.nomeUf}"/>
						<p:message for="uf" /> 
				</h:panelGrid>
			
			</p:panel>
<p:panel toggleable="true" header="Dados Login">
			
			
				<h:panelGrid id="gridLogin" columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.login']}" for="login" /> 
	            		<p:inputText id="login" required="true" requiredMessage="#{msgs['campo.obrigatorio']}"
	            					 value="#{cadastroClientePFBean.login.login}" maxlength="10" tabindex="10" >
	            			<p:ajax event="blur" listener="#{cadastroClientePFBean.verificarLogin}" update="login, mensagemLogin"  />
	            		</p:inputText>
						<p:message id="mensagemLogin" for="login" /> 
				</h:panelGrid>
				
				<h:outputText value="#{msg}" />
				<h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.email']}" for="email" /> 
	            		<p:inputText id="email" required="true" requiredMessage="#{msgs['campo.obrigatorio']}"
	            					 value="#{cadastroClientePFBean.login.email}" tabindex="11">
	            			<f:validator validatorId="br.com.montreal.validaEmail"/>
	            		</p:inputText>
						<p:message for="email" /> 
				</h:panelGrid>
				
				
				<h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.senha']}" for="senha" /> 
	            		<h:inputSecret id="senha" required="true" requiredMessage="#{msgs['campo.obrigatorio']}" immediate="true"
	            					 value="#{cadastroClientePFBean.login.senha}" tabindex="12">
	            		</h:inputSecret>
						<p:message for="senha" /> 
				</h:panelGrid>
				
				<h:panelGrid columns="3" columnClasses="labelPanelGrid, contentPanelgrid" rowClasses="">
	            	<h:outputLabel value="#{msgs['label.confirmar.senha']}" for="confirmarSenha" /> 
	            		<h:inputSecret id="confirmarSenha" value="#{cadastroClientePFBean.senhaConfirmada}" immediate="true"
	            							 required="true" requiredMessage="#{msgs['campo.obrigatorio']}" tabindex="13" />
	            			
						<p:message id="mensagemConfirmaSenha" for="confirmarSenha" /> 
				</h:panelGrid>
			
			</p:panel>
			
			<p:commandButton action="#{cadastroClientePFBean.salvarCliente}" value="cadastrar" update="@form"/>
			
			<p:commandButton value="Cancelar" action="#{cadastroClientePFBean.cancelar}" />

Meu codigo do ManagedBean

@ManagedBean(name="cadastroClientePFBean")
@RequestScoped
public class CadastroClientePFBean extends BaseManagedBean implements Serializable{
	
	private static final long serialVersionUID = 1L;

	@Inject
	ICepEjb cepEjb;
	
	@Inject
	ILoginEjb loginEjb;
	
	@Inject
	ICadastroClienteEjb cadastroClienteEjbLocal;
	
	private Cep cep = new Cep();
	
	private Usuario usuario = new Usuario();
	
	private Endereco endereco = new Endereco();
	
	private Login login = new Login();
	
	private String senhaConfirmada;
	
	
	public void recuperarCep(){
		
		try {
			
			Cep novoCep = cepEjb.buscarCepPorNumero(cep.getNumCep());
			
			if(null != novoCep){
				setCep(novoCep);
			}else{
				FacesContext.getCurrentInstance().addMessage("cep", new FacesMessage(FacesMessage.SEVERITY_WARN, "O Cep não foi encontrado!", null));
			}
			
			
		} catch (DaoExcecao e) {
			
			e.printStackTrace();
		}
		
	}
public boolean verificarSenhaDigitada() {
		
		boolean senhaConfere = false;

		if (!login.getSenha().equals(senhaConfirmada)) {
			senhaConfere = false;
			FacesContext.getCurrentInstance().addMessage("confirmarSenha", new FacesMessage(FacesMessage.SEVERITY_ERROR, "Senha redigitada incorretamente. Favor corrigi-la.", null));		
		} else {
			senhaConfere = true;
		}
		return senhaConfere;
		
	}
	
	public String salvarCliente() throws DaoExcecao {	
			
		if (!verificarLogin() && verificarSenhaDigitada()) {			
			cadastroClienteEjbLocal.cadastrarPF(usuario, login, endereco, cep, "1");
			FacesContext.getCurrentInstance().addMessage("formLogin", new FacesMessage(FacesMessage.SEVERITY_WARN, "Cliente cadastrado com sucesso!", null));
			return "sucesso";
		}	
		return null;
	}
}

Acho que para injetar o ejb no managed bean seria usar a anotação @EJB. O @Inject é para quando você usa CDI(@Named no lugar de @ManagedBean).
Outra coisa você criou os getters e setters dos cep?
Tenta também mudar de @RequestScoped pra @ViewScoped, com request os teus objetos só vivem a requisição.

Da uma olhada em process (PrimeFaces) ou execute (JSF 2/ RichFaces)

Eu usei a anotação ViewScoped, todo o ajax parou de funcionar e apareceu o erro

14:41:03,960 SEVERE [javax.enterprise.resource.webcontainer.jsf.application] (http-localhost-127.0.0.1-8080-6) org.jboss.msc.service.ServiceName from [Module "deployment.sbecloud_ear.ear.xxxxxx_web.war:main" from Service Module Loader]: java.lang.ClassNotFoundException: org.jboss.msc.service.ServiceName from [Module "deployment.sbecloud_ear.ear.xxxxxx_web.war:main" from Service Module Loader]
	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468)
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456)
	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120)
	at java.lang.Class.forName0(Native Method) [rt.jar:1.7.0_06]
	at java.lang.Class.forName(Class.java:264) [rt.jar:1.7.0_06]
	at com.sun.faces.renderkit.ApplicationObjectInputStream.resolveClass(ApplicationObjectInputStream.java:95) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1593) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1514) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1750) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369) [rt.jar:1.7.0_06]
	at java.util.HashMap.readObject(HashMap.java:1155) [rt.jar:1.7.0_06]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_06]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0_06]
	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369) [rt.jar:1.7.0_06]
	at java.util.HashMap.readObject(HashMap.java:1155) [rt.jar:1.7.0_06]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_06]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0_06]
	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1685) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369) [rt.jar:1.7.0_06]
	at java.util.HashMap.readObject(HashMap.java:1155) [rt.jar:1.7.0_06]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_06]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0_06]
	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347) [rt.jar:1.7.0_06]
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369) [rt.jar:1.7.0_06]
	at com.sun.faces.renderkit.ClientSideStateHelper.doGetState(ClientSideStateHelper.java:255) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.renderkit.ClientSideStateHelper.getState(ClientSideStateHelper.java:198) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.renderkit.ResponseStateManagerImpl.getState(ResponseStateManagerImpl.java:100) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:224) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:188) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:123) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:453) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:142) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:303) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
	at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:192) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) [jsf-impl-2.1.7-jbossorg-2.jar:]
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
	at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:368) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:177) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:169) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237) [spring-web-3.0.3.RELEASE.jar:3.0.3.RELEASE]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) [spring-web-3.0.3.RELEASE.jar:3.0.3.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:]
	at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:]
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:]
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
	at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_06]

Nem o process (primefaces) e nem o update (JSF) fizeram efeito, os dados dos campos continuam desaparecendo.
A única solução, não sei se é a mais correta, foi chamar novamente o método após o erro na confirmação da senha, conforme codigo abaixo; porque o comandButton tem um update=@form e se eu retira-lo dá pau em tudo.

	public boolean verificarSenhaDigitada() {
		
		boolean senhaConfere = false;

		if (!login.getSenha().equals(senhaConfirmada)) {
			senhaConfere = false;
			FacesContext.getCurrentInstance().addMessage("confirmarSenha", new FacesMessage(FacesMessage.SEVERITY_ERROR, "Senha redigitada incorretamente. Favor corrigi-la.", null));
			this.recuperarCep();
		} else {
			senhaConfere = true;
		}
		return senhaConfere;
		
	}

mrsClass,

É o que o ayslanms falou, você não deve misturar @ManagedBean (uma anotação do JSF) e @Inject (uma anotação do CDI). Veja: Using CDI and Dependency Injection for Java in a JSF 2.0 Application. Pelo seu código, presumo que você deveria usar @EJB.

Eu acho que o erro que você postou acima não tem a ver com o uso do @ViewScoped. Recomendo dar uma olhada primeiro nessa questão do uso de JSF + EJB/CDI.

Pessoal, desculpe a demora na resposta. Consegui resolver com um pequeno javascript no formulario e algumas mudanças no ManagedBean. Vlw pela ajuda de todos.