jsf 2.0 bean 扩展了另一个 bean 目标无法访问，'null'返回空值
public class SuperUser extends User implements Serializable{
private static final long serialVersionUID = 1L;
private String username;
private String pin;
//getters and setters
}
当我在托管 bean 中使用它并尝试在facelets文件中访问它时，
<h:inputText id="firstName" value="#{userManager.superUser.firstName}" required="true" maxlength="30" size="30"/>
我得到一个异常
javax.el.PropertyNotFoundException: /superUser/create.xhtml @18,96 value="#{userManager.superUser.firstName}": Target Unreachable
，这是否意味着如果您想访问它们的属性，您无法扩展java bean？
谢谢
public class SuperUser extends User implements Serializable{
private static final long serialVersionUID = 1L;
private String username;
private String pin;
//getters and setters
}
when I use this in a managed bean and try to access it in the facelets file like this
<h:inputText id="firstName" value="#{userManager.superUser.firstName}" required="true" maxlength="30" size="30"/>
I get an exception
javax.el.PropertyNotFoundException: /superUser/create.xhtml @18,96 value="#{userManager.superUser.firstName}": Target Unreachable
Does that mean the you cannot extend java beans if you want to access their properties?
Thanks
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它只是意味着
#{userManager.superUser}返回了null，因此无法对其调用setFirstName()。 JSF 不会为您创建嵌套对象属性。你必须自己做。要解决此问题，只需确保
#{userManager}后面的支持 bean 类内部不为 null。例如It just means that
#{userManager.superUser}returnednulland hencesetFirstName()cannot be called on it. JSF won't create nested object properties for you. You have to do it yourself.To fix this, just ensure inside the backing bean class behind
#{userManager}that it's not null. E.g.User 类中的方法
getFirstName()是公共的吗？同样，userManager 托管 bean 的 getSuperUser() 是公共的吗？
Is the method
getFirstName()inside User class public?Similarly, is
getSuperUser()of the userManager managed bean public?