Spring MVC 3.2 -- NotReadablePropertyException

Question

我在Spring 3.2应用程序中得到以下异常:

org.springframework.beans.NotReadablePropertyException: Invalid property 'name' of bean class [java.util.ArrayList]: Bean property 'name' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
    at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:729)
    at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:721)
    at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:147)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:178)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:198)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:164)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:151)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:142)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:126)
    at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:421)
    at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142)
    at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:102)
    at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79)
    at org.apache.jsp.WEB_002dINF.jsp.EnterBulletin_jsp._jspx_meth_form_005finput_005f0(EnterBulletin_jsp.java:403)
    at org.apache.jsp.WEB_002dINF.jsp.EnterBulletin_jsp._jspx_meth_form_005fform_005f0(EnterBulletin_jsp.java:347)
    at org.apache.jsp.WEB_002dINF.jsp.EnterBulletin_jsp._jspService(EnterBulletin_jsp.java:108)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1265)
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1016)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:965)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:859)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:883)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:792)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

这是我的控制器中的方法。我把一个数组列表放到命令对象中，所以以后从命令对象中取出公告对象会出现问题。

@RequestMapping(value = "/getApprovedBulletins", method = RequestMethod.POST)
public ModelAndView getApprovedBulletins(
        @ModelAttribute("bulletin") Bulletin bulletin, BindingResult result) {
    ModelAndView mav = new ModelAndView();
    try {
        List<Bulletin> bulletins = bulletinDAO.getApprovedBulletins();
        mav.setViewName("EnterBulletin");
        if (bulletins != null) {
            mav.addObject("command", bulletins);
        }
    } catch (Exception e) {
        System.out.println(e.getMessage());
        mav.setViewName("FailurePage");
    }
    return mav;
}

由于某种原因，当我试图做的是在顶部列出公告时，问题被标记在页面顶部的表单行上。这是JSP。什么好主意吗?

<body>
    <h1>Job Connections Bulletin Board</h1>
    <h2>Bulletin Entry</h2>
    <b><font color="red"><c:out value='${confirmation}' /></font></b>
    <c:remove var="confirmation" scope="session" />
    <p>Here you can post comments, announce jobs, etc. All comments are
        subject to approval.</p>
    <p>
        To search bulletins, click <a href="SearchPage.jsp">here</a>.
    </p>
    <c:forEach var="bulletin" items="${bulletins}">
        <c:if test="${bulletin.approved}">
            <c:url value="/getSingleBulletin"
                var="{bulletin.name} -- {bulletin.subject}">
                <c:param name="id">${bulletin.id}</c:param>
            </c:url>
            <br />
            <br />
        </c:if>
    </c:forEach>
    <form:form command="bulletin" method="post" action="/processBulletin">
        <table>
            <tr>
                <td>Name:</td>
                <td><form:input path="name" maxlength="30" /></td>
            </tr>
            <tr>
                <td>Subject:</td>
                <td><form:input path="subject" maxlength="50" /></td>
            </tr>
            <tr>
                <td>Message:</td>
                <td><form:textarea path="note" cols="50" rows="50" /></td>
            </tr>
            <tr>
                <td><input type="button" value="Submit bulletin" name="submit" /></td>
                <td>&nbsp;</td>
            </tr>
        </table>
    </form:form>
</body>

Answer 1

问题解决。我把List放在会话对象中，然后把Bulletin的一个实例放在命令对象中。我的代码现在看起来像这样。

List<Bulletin> bulletins = bulletinDAO.getApprovedBulletins();
mav.setViewName("EnterBulletin");
if (bulletins != null) {
    ServletRequestAttributes attributes = 
        (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
    HttpSession session = attributes.getRequest().getSession(true);
    session.setAttribute("bulletins", bulletins);
    mav.addObject("command", new Bulletin());
}