无法在JSF应用程序中呈现selectManyCheckbox

我的问题是我不能在一个简单的Jsf应用程序中呈现h:selectManyCheckbox组件。虽然h:selectBooleanCheckbox和h:commandButton在输出中正常出现，但selectManyCheckbox没有。缺少下列代码来呈现组件的是什么?

<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">
<h:form>
    <h:selectManyCheckbox value="#{hello.customers}"></h:selectManyCheckbox><br />
    <h:selectBooleanCheckbox value="#{hello.foo}" /><br/>
    <h:commandButton action="response.xhtml" value="Click me" />
</h:form>
</html>

Bean类:

@ManagedBean
@SessionScoped
public class Hello implements Serializable{
private static final long serialVersionUID = 1L;
private List<String> customers;
private boolean foo;
public Hello(){
    customers = new ArrayList<String>();
    customers.add("Cust1");
    customers.add("Cust3");
    customers.add("Cust2");
    customers.add("Cust4");
    //foo = true;
}
public List<String> getCustomers() {
    return customers;
}
public boolean isFoo() {
    return foo;
}
}

检查下面修改的代码

<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">
<h:form>
 <h:selectManyCheckbox value="#{hello.customerSelected}">
    <f:selectItems value="#{hello.customers}" />
</h:selectManyCheckbox><br />
<h:selectBooleanCheckbox value="#{hello.foo}" /><br/>
<h:commandButton action="response.xhtml" value="Click me" />
</h:form>
</html>

在Bean类中再添加一个字段来存储已检查元素的结果。

@ManagedBean
@SessionScoped
public class Hello implements Serializable {
private static final long serialVersionUID = 1L;
public String[] customerSelected;
private List<String> customers;
private boolean foo;
public Hello() {
    customers = new ArrayList<String>();
    customers.add("Cust1");
    customers.add("Cust3");
    customers.add("Cust2");
    customers.add("Cust4");
    // foo = true;
}
public List<String> getCustomers() {
    return customers;
}
public boolean isFoo() {
    return foo;
}
String[] getCustomerSelected() {
    return customerSelected;
}
void setCustomerSelected(String[] customerSelected) {
    this.customerSelected = customerSelected;
}
}

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