我遇到与访问对象属性相关的问题。我无法理解发生了什么。我做了很多次，我从来没有这样做过。
我的xhtml页面代码是：
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML `enter code here`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:ui="http://xmlns.jcp.org/jsf/facelets">
<h:head>
<title>Facelet Template</title>
</h:head>
<h:body>
<ui:composition template="./Template.xhtml">
<ui:define name="top">
</ui:define>
<ui:define name="left"></ui:define>
<ui:define name="content">
<h:form>
<h:panelGrid columns="2" bgcolor="#EBBBBF">
<h:outputText value='#{bMain.getTranslation("username")}'/><h:inputText value="#{bMain.user.username}"/>
<h:outputText value='#{bMain.getTranslation("password")}'/><h:inputSecret value="#{bMain.user.password}"/>
<h:commandButton value='#{bMain.getTranslation("send")}' action="#{bMain.validateUser()}"/>
</h:panelGrid>
</h:form>
</ui:define>
</ui:composition>
</h:body>
</html>
这是BMain类的代码：
public class BMain {
private User user;
private final Gestor modelo= new Gestor();
private ArrayList<String> permisos;
public BMain() {
Language language = new Language();
language.setDescription("EN");
this.user = new User();
this.permisos= new ArrayList();
JSFUtil.setAtributte("language", language);
}
public String closeSession(){
JSFUtil.logOut();
return "index";
}
public String validateUser(){
String username = user.getUsername();
String password = user.getPassword();
this.user = this.modelo.checkUser(username, password);
try {
this.permisos = modelo.getPermisos(user);
} catch (Exception ex) {
System.out.println("");
}
if(this.user != null){
JSFUtil.setAtributte("modelo", modelo);
JSFUtil.setAtributte("user", user);
JSFUtil.setAtributte("language", user.getLanguage());
return "inicio";
}
return "index";
}
/**
* @return the usuario
*/
public User getUser() {
return user;
}
public boolean checkPermisos(String permiso){
for(int i=0; i<permisos.size(); i++){
if (permiso.equals(permisos.get(i)))
return true;
}
return false;
}
public String getTranslation(String name){
String translation = "";
try {
translation = this.modelo.getTranslation(name);
} catch (Exception ex) {
}
return translation;
}
}
来自gestor类的方法checkUser：
public User checkUser(String username, String password) {
String sql="from User us where us.username='" + username + "' and us.password='" + password +"'";
ArrayList<User> users;
try {
users= (ArrayList<User>) this.seleccionar(sql);
if(!users.isEmpty() && users.size() == 1){
User user= users.get(0);
return user;
}
} catch (Exception ex) {
System.out.println("");
}
return null;
}