AJAX and ViewParms w/ JSF 2.0

//XHTML Page
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:ui="http://java.sun.com/jsf/facelets">
    <ui:composition template="/templates/masterLayout.xhtml">
        <ui:define name="content">
            <f:metadata>
                <f:viewParam name="lineid" value="#{lineViewBean.lineid}" required="true" requiredMessage="#{msgs.lblNoLineInfo}">
                    <f:validateLongRange minimum="1"/>
                </f:viewParam>
                <f:event type="preRenderView" listener="#{lineViewBean.loadLine}"/>
            </f:metadata>

            <h3><h:outputText id="headerText" value="#{lineViewBean.line.name} Details"/></h3>

            <h:form id="lineDetails">
                <h:messages id="msgs"/>
                <h:inputText id="lineName" value="#{lineViewBean.line.name}">
                    <f:ajax event="keyup" listener="updateListener" render="@this msgs" />
                </h:inputText>
                <h:message for="lineName" />
                <h:commandButton id="btnSave" action="#{lineViewBean.update}" value="#{msgs.btnSave}"/>
                <h:commandButton action="#{lineViewBean.delete}" value="#{msgs.btnDelete}" />
            </h:form>
                <h:link outcome="listLines" value="#{msgs.lnkBrowseCatalog}" />
        </ui:define>
    </ui:composition>
</html>


//backingbean
package com.tf.web;

import com.tf.facade.LineMaintainFacade;
import com.tf.model.Line;
import java.io.Serializable;
import javax.ejb.EJB;
import javax.faces.bean.ViewScoped;
import javax.faces.bean.ManagedBean;

@ManagedBean(name = "lineViewBean")
@ViewScoped
public class LineViewViewBackingBean implements Serializable {

    @EJB
    private LineMaintainFacade lineService;

    private Line line;
    private Long lineId;

    public Long getLineid() {
        return lineId;
    }

    public void setLineid(Long lineid) {
        this.lineId = lineid;
    }

    public void loadLine() {
        if (line == null) {
            line = lineService.getLine(lineId);
        }
    }

    public Line getLine() {
        return line;
    }

    public void setLine(Line line) {
        this.line = line;
    }

    public void updateListener (AjaxBehaviorEvent event){
        line = lineService.update(line);
    }

    public String update() {
        line = lineService.update(line);
        return "update";
    }
}