Primefaces 5

Primefaces 5 - 动态p：菜单问题(Primefaces 5 - Dynamic p:menu issues)

我是Primefaces的新手，我正在遵循版本5.0的用户指南。我已经成功构建了一个静态菜单。现在我正在尝试构建一个非常简单的动态菜单，基本上在用户指南上复制粘贴示例（如果感兴趣，请参阅第294页）。但它不起作用。

这是我的XHTML页面：

<?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html" xmlns:p="http://primefaces.org/ui"> <h:head> <title>test-primefaces</title> </h:head> <h:body> <h:form> <p:menu model="#{menuBean.model}" /> </h:form> </h:body>

这是我的MenuBean.java

import javax.faces.bean.ManagedBean; import javax.faces.bean.SessionScoped; import org.primefaces.model.menu.DefaultMenuItem; import org.primefaces.model.menu.DefaultMenuModel; import org.primefaces.model.menu.DefaultSubMenu; import org.primefaces.model.menu.MenuModel; @ManagedBean @SessionScoped public class MenuBean { private MenuModel model; public MenuBean() { model = new DefaultMenuModel(); //First submenu DefaultSubMenu firstSubmenu = new DefaultSubMenu("Dynamic Submenu"); DefaultMenuItem item = new DefaultMenuItem("External"); item.setUrl("http://www.primefaces.org"); item.setIcon("ui-icon-home"); firstSubmenu.addElement(item); model.addElement(firstSubmenu); //Second submenu DefaultSubMenu secondSubmenu = new DefaultSubMenu("Dynamic Actions"); item = new DefaultMenuItem("Save"); item.setIcon("ui-icon-disk"); item.setCommand("#{menuBean.save}"); item.setUpdate("messages"); secondSubmenu.addElement(item); item = new DefaultMenuItem("Redirect"); item.setIcon("ui-icon-search"); item.setCommand("#{menuBean.redirect}"); secondSubmenu.addElement(item); model.addElement(secondSubmenu); } public MenuModel getModel() { return model; } }

菜单不起作用，因为我尝试运行该项目（我正在使用Netbeans），出现以下错误

无法找到含有“j_idt5：j_idt6”引用的表达式“消息”的组件。

我无法理解为什么我能得到它，而Google一直无法帮助我。大部分疑问都是关于我在MenuBean.java中使用的注释和导入，因为Netbeans告诉我，来自“javax.faces.bean”的注释将在下一个JSF版本中被弃用。

另一个奇怪的事实是，在XHTML页面中，如果我改变了

<p:menu model="#{menuBean.model}" /> with <p:megaMenu model="#{menuBean.model}" />

我没有收到错误信息，但菜单并没有显示levle两个菜单项，我只是看到一个带有“Dynamic Submenu”和“Dynamic Actions”的菜单，没有任何子项。

我错过了什么？如果需要，我愿意提供更多关于我的代码/项目的信息。

I'm new to Primefaces, and I'm following the User Guide of Version 5.0. I've successfully built a static menu. Now I'm trying to build a very simple dynamic menu, basically copy-pasting the example on the user guide (page 294, if you are interested). But it's not working.

This is my XHTML page:

<?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html" xmlns:p="http://primefaces.org/ui"> <h:head> <title>test-primefaces</title> </h:head> <h:body> <h:form> <p:menu model="#{menuBean.model}" /> </h:form> </h:body>

This is my MenuBean.java

import javax.faces.bean.ManagedBean; import javax.faces.bean.SessionScoped; import org.primefaces.model.menu.DefaultMenuItem; import org.primefaces.model.menu.DefaultMenuModel; import org.primefaces.model.menu.DefaultSubMenu; import org.primefaces.model.menu.MenuModel; @ManagedBean @SessionScoped public class MenuBean { private MenuModel model; public MenuBean() { model = new DefaultMenuModel(); //First submenu DefaultSubMenu firstSubmenu = new DefaultSubMenu("Dynamic Submenu"); DefaultMenuItem item = new DefaultMenuItem("External"); item.setUrl("http://www.primefaces.org"); item.setIcon("ui-icon-home"); firstSubmenu.addElement(item); model.addElement(firstSubmenu); //Second submenu DefaultSubMenu secondSubmenu = new DefaultSubMenu("Dynamic Actions"); item = new DefaultMenuItem("Save"); item.setIcon("ui-icon-disk"); item.setCommand("#{menuBean.save}"); item.setUpdate("messages"); secondSubmenu.addElement(item); item = new DefaultMenuItem("Redirect"); item.setIcon("ui-icon-search"); item.setCommand("#{menuBean.redirect}"); secondSubmenu.addElement(item); model.addElement(secondSubmenu); } public MenuModel getModel() { return model; } }

The menu is not working, as I try to run the project (I'm using Netbeans) I get the following error

Cannot find component with expression "messages" referenced from "j_idt5:j_idt6".

I'm not able to undertand why I get it, and Google has not been able to help me. Most doubts are about the annotation and the imports I used in MenuBean.java, since Netbeans tells me that annotations from "javax.faces.bean" will be deprecated in the next JSF version.

Another curious fact, in the XHTML page, if I change

<p:menu model="#{menuBean.model}" /> with <p:megaMenu model="#{menuBean.model}" />

I don't get the error, but the menu does not render the levle two menu items, I just see a menu with "Dynamic Submenu" and "Dynamic Actions", without any children entries.

What am I missing? I am willing to provide more information about my code/project, if necessary.