jsf 2.2中expression must be a value expression but is a method expression错误

Question

我是 jsf 新手。我编写了一个简单的应用程序来从数据库中检索数据。我正在以 xhtml 形式调用一个方法，但它给我的错误如下

Expression must be a value expression but is a method 
 expression

这是我的代码：

<?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://java.sun.com/jsf/html"
  xmlns:f="http://java.sun.com/jsf/core"
  >
<h:head>
    <h:outputStylesheet library="css" name="table-style.css"  />
</h:head>

<h:body>

    <h1>JSF 2.0 + JDBC Example</h1>

    <h:dataTable value="#{member.getMemberList()}" var="mem"
            styleClass="order-table"
            headerClass="order-table-header"
            rowClasses="order-table-odd-row,order-table-even-row"
        >

        <h:column>
            <f:facet name="header">
                Customer ID
            </f:facet>
                #{mem.FirstName}
        </h:column>

        <h:column>
            <f:facet name="header">
                Name
            </f:facet>
                #{mem.LastName}
        </h:column>

        <h:column>
            <f:facet name="header">
                Email
            </f:facet>
                #{mem.Email}
        </h:column>

        <h:column>
            <f:facet name="header">
                Password
            </f:facet>
                #{mem.Password}
        </h:column>

    </h:dataTable>

</h:body>
</html>

这一行出错

<h:dataTable value="#{member.getMemberList()}" var="mem"
            styleClass="order-table"
            headerClass="order-table-header"
            rowClasses="order-table-odd-row,order-table-even-row"
        >

任何人都可以帮助我解决这个错误。我将不胜感激...... :)

Answer 1

在托管 bean member 中检查属性 memberList 是否同时具有 getter 和 setter .然后将数据表代码替换为：

<h:dataTable value="#{member.memberList}" var="mem"
            styleClass="order-table"
            headerClass="order-table-header"
            rowClasses="order-table-odd-row,order-table-even-row"
        >

希望对您有所帮助。

jsf 2.2中expression must be a value expression but is a method expression错误

Expression must be a value expression but is a method expression error in jsf 2.2

jsf

jsf-2.2