在类型java.lang.String上找不到属性'someproperty' [英] Property 'someproperty' not found on type java.lang.String

问题描述

我收到此错误，我无法弄清问题可能出在哪里。 userid列位于数据库中并位于bean中。有谁有想法吗？

I am getting this error and I can not figure out where the problem might be. The "userid" column is in the database and is in the bean. Does anyone have any idea?

org.apache.jasper.JasperException: An exception occurred processing JSP page /user.jsp     at line 24  

21:   
22:     <form method="POST" action="AdminServlet" name="frmAddUser">  
23:         User ID : <input type="text" readonly="readonly" name="userid"  
24:             value="<c:out value="${user.userid}" />" />   
Username : <input  
25:             type="text" name="firstName"  
26:             value="<c:out value="${user.firstName}" />" />   
LastName : <input  
27:             type="text" name="lastName"  

root cause   

javax.el.PropertyNotFoundException: Property 'userid' not found on type java.lang.String 

谢谢。

推荐答案

例外基本告诉你 $ {user} 是一个普通的 java.lang.String中。根据 javadoc ，它确实没有 getUserid（）表示 userid 属性的方法。

The exception is basicaly telling you that ${user} is an ordinary java.lang.String. According to the javadoc, it has indeed no getUserid() method representing an userid property.

确保在所需范围内设置具体的 User 实例，而不是普通的 String 。由于你没有在问题的任何地方展示你如何准备范围变量，因此无法给出有针对性的答案，但它至少应该是这样的：

Make sure that you're setting a concrete User instance in the desired scope instead of a plain vanilla String. As you haven't shown anywhere in the question how you're preparing the scoped variable, it isn't possible to give a targeted answer on that, but it should at least look something like this:

User user = userService.find(id);
request.setAttribute("user", user); // and thus not e.g. setAttribute("user", "user") or something.

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