这个错误是什么意思？

Question

javax.servlet.jsp.JspException: Exception thrown by getter for property:
"report.reportData" of bean: "FarmReportTenDaysForm"
at org.apache.struts.taglib.TagUtils.lookup(TagUtils.java:969)
at org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:232)
at _mms._report._viewfarmreporttendays__jsp._jspService(D:\eclipse3.2\workspace\espc\web\mms\report\viewFarmReportTenDays.jsp:84)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.subservice(Page.java:506)
at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:222)
at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:103)
at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:80)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:103)
at com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:78)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:246)
at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:164)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:595)viewFarmReportTenDays.jsp:84 是这样写的：<logic:iterate id="record" name="FarmReportTenDaysForm" property="report.reportData" indexId="s">report类中，有reportDate这个方法。
为什么还有这样的错误出现。

Answer 1

FarmReportTenDaysForm类中的getter函数不符合规范

Answer 2

private FarmReportTenDays report = null;
public FarmReportTenDays getReport() {
if (report == null) {
report = new FarmReportTenDays();
}
return report;
}
public void setReport(FarmReportTenDays report) {
this.report = report;
}private List reportData = null;
public List getReportData() {
if (reportData == null) {
reportData = new ArrayList();
}
return reportData;
}
public void setReportData(List reportData) {
this.reportData = reportData;
}写的不对吗