PropertyNotFoundException：在类型X上找不到属性“ X”

Question

我有viewprofile操作，用于显示用户的详细信息和交易记录。

History.java ：

public class History {

    private String transactionId;
    private Date transactionDate;
    private String movieTitle;
    private BigDecimal schedulePrice;
    private String mallName;
    private int scheduleCinema;
    private Date scheduleDate;
    private Time scheduleTime;

    // getters and setters
}

ViewProfileAction.java ：

public class ViewProfileAction extends ActionSupport implements SessionAware, RequestAware {
    private static final long serialVersionUID = 1L;

    private Map<String, Object> session;
    private Map<String, Object> request;

    @Override
    public String execute() throws Exception {      
        if(!session.containsKey("currentUserId")) {
            return "index"; // return to index if not logged in
        }

        String currentUserId = (String) session.get("currentUserId");       

        UserManager um = new UserManager();
        String registeredUserEmail = um.getCurrentUserDetail("user_email", currentUserId);
        Date registeredDate = um.getRegisteredDate(currentUserId);
        int totalTransactions = um.getTotalTransactions(currentUserId);

        List<History> historyList = new DatabaseManipulator().getTransactionHistory(currentUserId);

        request.put("registeredUserEmail", registeredUserEmail);
        request.put("registeredDate", registeredDate);
        request.put("totalTransactions", totalTransactions);
        request.put("historyList", historyList);

        return SUCCESS;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }

    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;     
    }   
}

user-profile.jsp ：

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<body>
    <table class="displaytbl">
    <tr>
        <td class="maintitle" colspan="7">TRANSACTION HISTORY</td>
    </tr>
    <tr>
        <!-- column titles -->
    </tr>
    <c:choose>
        <c:when test="${historyList.isEmpty()}">
            <tr>
                <td class="norecord" colspan="7">NO RECORDED TRANSACTIONS</td>
            </tr>
        </c:when>

        <c:otherwise>
            <c:forEach var="history" items="historyList">
            <tr>
                <td>${history.transactionDate}</td>
                <td>${history.movieTitle}</td>
                <td>${history.schedulePrice}</td>
                <td>${history.mallName}</td>
                <td class="center">${history.scheduleCinema}</td>
                <td>${history.scheduleDate}</td>
                <td>${history.scheduleTime}</td>
            </tr>
            </c:forEach>
        </c:otherwise>
    </c:choose>
    </table>
</body>

struts.xml ：

<action name="viewprofile" class="com.mypackage.action.ViewProfileAction">
    <result>/user-profile.jsp</result>
    <result name="index" type="redirect">/index.jsp</result>
</action>

堆栈跟踪：

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

我不确定在History确实具有上述属性时，为什么会引发PropertyNotFoundException 。 如何解决这个问题？

Answer 1

似乎在Jsp页面的下一行出现问题。 history只会指向简单的String historyList而不是您的集合对象。

<c:forEach var="history" items="historyList">

下面的行实际上试图从history对象获取transactionDate ，它不过是a String onject

<td>${history.transactionDate}</td>

上面没有下面的内容，您可能需要使用<c:forEach var="history" items="${historyList}">

request.put("historyList", historyList);

Answer 2

您将完全绕过框架机制。 而不是使用request ，将私有属性与getter和setter一起使用：

public class ViewProfileAction extends ActionSupport implements SessionAware {
    private static final long serialVersionUID = 1L;

    private Map<String, Object> session;

    private List<History> historyList;
    private String        registeredUserEmail;
    private Date          registeredDate;
    private int           totalTransactions;

    /* Generate GETTERS AND SETTERS for above fields here */

    @Override
    public String execute() throws Exception {      
        if(!session.containsKey("currentUserId")) {
            return "index"; // return to index if not logged in
        }

        String currentUserId = (String) session.get("currentUserId");

        UserManager um = new UserManager();
        registeredUserEmail = um.getCurrentUserDetail("user_email", currentUserId);
        registeredDate = um.getRegisteredDate(currentUserId);
        totalTransactions = um.getTotalTransactions(currentUserId);

        historyList = new DatabaseManipulator().getTransactionHistory(currentUserId);

        return SUCCESS;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }    
}

另外，由于安全问题和功能降低（对于JSTL和Struts2标签+ OGNL），也应避免使用JSP EL，这将是Struts2项目中的理想选择。

会话用户检查可以在Interceptor中执行一次，而无需将其置于项目的每个操作中。 阅读如何编写自己的Interceptor进行会话检查。

PropertyNotFoundException：在类型X上找不到属性“ X”

问题描述

2 个解决方案

解决方案1
3 已采纳 2014-12-01 10:04:45

解决方案2
1 2014-12-01 10:06:26

PropertyNotFoundException：在类型X上找不到属性“ X”

问题描述

2 个解决方案

解决方案1 3 已采纳 2014-12-01 10:04:45

解决方案2 1 2014-12-01 10:06:26

解决方案1
3 已采纳 2014-12-01 10:04:45

解决方案2
1 2014-12-01 10:06:26