JSF 2-找不到Ajax属性

Question

I got this error:

execute="#{localeManager.changeLocale}": Property 'changeLocale' not found on type xyz.com.i18n.LocaleManager

where LocaleManager is:

@ManagedBean
@ViewScoped
public class LocaleManager implements Serializable
{
    // other codes here

    public static void changeLocale(AjaxBehaviorEvent event) {
       newLocale = (Locale) new Locale((String) event.toString());
       FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put("selectedLocale", newLocale); 
    }
}

and I'm calling the bean's method here:

<h:selectOneMenu id="selectLang" immediate="true" value="#{langListing.language}">
    <f:ajax event="change" execute="#{localeManager.changeLocale}" />
    <f:selectItems value="#{langListing.languages}" />
</h:selectOneMenu>

I'm learning AJAX by experimenting with this code. But I don't understand how Ajax evaluates bean's method. Is this a straightforward issue to resolve?

Answer 1

As per the <f:ajax> tag documentation the execute attribute should refer to a collection of client IDs which are to be processed at the server side. This should not refer to some bean action method. The exception is coming because it's expecting a getter method which returns a collection of client IDs.

You want to use the listener attribute instead.

<f:ajax listener="#{localeManager.changeLocale}" />

Note that the default event for h:selectOneMenu is already valueChange . You can just omit it.