Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Ask a Question
Welcome To Ask or Share your Answers For Others

Categories

java - spring app not finding property on object

0 votes
331 views
in Technique[技术] by (71.8m points)

java - spring app not finding property on object

I have an object calendar of type AppointmentCalendar. In a jsp called calendar.jsp, I call one of calendar's properties as calendar.day. But I am getting an error saying: 

org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 9): Field or property 'day' cannot be found on object of type

Can anyone show me how to resolve this?

Here is the part of calendar.jsp which refers to the day property: 

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@ taglib prefix="joda" uri="http://www.joda.org/joda/time/tags" %>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>
</head>
<body>
    <div id="appointmentDay" class="prepend-6 span-4 alt">
        <spring:eval expression="calendar.day" />
    </div>
    <div id="appointmentNavigation" class="span-3 append-11 last alt">
        <c:url var="previousLink" value="/calendar">
            <c:param name="day" value="${calendar.previousDay}" />
        </c:url>
        <a href="${previousLink}">Previous</a>
        <c:url var="nextLink" value="/calendar">
            <c:param name="day" value="${calendar.nextDay}" />
        </c:url>
        <a href="${nextLink}">Next</a>  
    </div>
    <div id="dayPicker" class="span-6"></div>
    ... other irrelevant code
</body>
</html>

Here is the part of EncounterController which manages the /calendar url pattern: 

@RequestMapping("/calendar")
public String showCalendar(Model model) {
    LocalDate today = new LocalDate();
    System.out.println("------------------------ in controller, day of month is:  "+today.getDayOfMonth());
    AppointmentCalendar calendar = new AppointmentCalendar(today); // Or whatever you do to create it
    model.addAttribute("calendar", calendar);
    return "appointments/calendar";
}

Here is AppointmentCalendar : 

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.joda.time.LocalDate;
import org.joda.time.LocalTime;
import org.springframework.format.annotation.DateTimeFormat;

public class AppointmentCalendar {
    @DateTimeFormat(style="F-")
    private LocalDate day;

    private List<Provider> providers;

    private List<Encounter> encounters; 

    public AppointmentCalendar(LocalDate day) {
        this.day = day;
        System.out.println(":::::::::::::::::::::::::: in AppointmentCalendar constructor, dayOfMonth is: "+day.getDayOfMonth());
    }

    public void setProviders(List<Provider> doctors) {
        this.providers = doctors;
        encounters = new ArrayList<Encounter>();
        for (int i = 0; i < 9; i++) {encounters.add(null);}
    }

    public void addEncounter(Encounter appointment) {
        int blockIndex = appointment.getDateTime().getHourOfDay() - 8;
        encounters.add(appointment);
    }

    public Long getDayMillis() {
        return day.toDateTimeAtStartOfDay().getMillis();
    }

    public List<LocalTime> getBlocks() {
        List<LocalTime> blocks = new ArrayList<LocalTime>(9);
        LocalTime time = new LocalTime(8, 0);
        for (int i = 0; i < 9; i++) {
            blocks.add(time);
            time = time.plusMinutes(60);
        }
        return blocks;
    }

    public Long getBlockMillis(LocalTime block) {return day.toDateTime(block).getMillis();}

    public Date getStartOfDay() {return day.toDateTime(getBlocks().get(0)).toDate();}

    public Date getEndOfDay() {return day.toDateTime(getBlocks().get(8)).plusMillis(60).toDate();}

    // resource links

    public LocalDate getPreviousDay() {return day.minusDays(1);}

    public LocalDate getNextDay() {return day.plusDays(1);}

    // internal

    private List<Encounter> createEncounterList(int size) {
        List<Encounter> appointments = new ArrayList<Encounter>(size);
        for (int i = 0; i < size; i++) {appointments.add(null);}
        return appointments;
    }
}

And here is the complete stack trace. Notice that they system.out.println() output at the start shows that the methods are firing in the correct order, and that there is a value for the day property: 

------------------------ in controller, day of month is:  6
:::::::::::::::::::::::::: in AppointmentCalendar constructor, dayOfMonth is: 6
Feb 6, 2014 1:34:21 PM org.apache.jasper.compiler.TldLocationsCache tldScanJar
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Feb 6, 2014 1:34:22 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 9): Field or property 'day' cannot be found on object of type 'org.springframework.samples.knowledgemanager.model.AppointmentCalendar'
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:216)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:85)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:43)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:346)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:82)
    at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102)
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:98)
    at org.springframework.web.servlet.tags.EvalTag.doEndTag(EvalTag.java:126)
    at org.apache.jsp.WEB_002dINF.jsp.appointments.calendar_jsp._jspx_meth_spring_005feval_005f0(calendar_jsp.java:217)
    at org.apache.jsp.WEB_002dINF.jsp.appointments.calendar_jsp._jspService(calendar_jsp.java:114)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:263)
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208)
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.github.dandelion.datatables.core.web.filter.DatatablesFilter.doFilter(DatatablesFilter.java:73)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.github.dandelion.datatables.extras.servlet2.filter.DatatablesFilter.doFilter(DatatablesFilter.java:71)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Feb 6,

与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

You should add a public getDay() method to AppointmentCalendar.
Spring needs this getter to get the value of day.

In general when using Spring managed beans/classes
always add the respective getter and setter methods.


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

Just Browsing Browsing

2.1m questions

2.1m answers

60 comments

57.0k users

Most popular tags

Powered by Question2Answer
Donate
Theme by Q2A Market&&OStack.cn
...