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  1. Spring Framework
  2. SPR-6871

Spring MVC regression: binding to indexed properties is broken


    • Type: Bug
    • Status: Closed
    • Priority: Critical
    • Resolution: Complete
    • Affects Version/s: 3.0.1
    • Fix Version/s: 3.0.2
    • Component/s: Web
    • Labels:
    • Last commented by a User:


      When you submit a form, with databinding on a command object with indexed properties, the indexed properties of the command object are not filled in.
      I think this bug is related to the correction that happened in SPR-6840.
      The characters [ and ] are not only removed from the id attrbute of the HTML elements, but also (unnessesary) from the name attribute of the HTML elements.

      You can see it happening via next example.
      When you type 10 and 20 in the input fields, the output to the console is:

      {Belgium=null, Switzerland=null}

      while the output should have been

      {Belgium=10, Switzerland=20}

      The class that acts as command object:
      package org.example.entities;

      import java.util.LinkedHashMap;
      import java.util.Map;

      public class Continent {
      // key = name of country
      // Integer= number of inhabitants
      private Map<String, Integer> countries = new LinkedHashMap<String, Integer>();

      public Continent()

      { countries.put("Belgium", null); countries.put("Switzerland", null); }

      public void setCountries(Map<String, Integer> countries)

      { this.countries = countries; }

      public Map<String, Integer> getCountries()

      { return countries; }


      The Controller class:
      package org.example.web;

      import org.example.entities.Continent;
      import org.springframework.stereotype.Controller;
      import org.springframework.ui.Model;
      import org.springframework.validation.BindingResult;
      import org.springframework.web.bind.annotation.ModelAttribute;
      import org.springframework.web.bind.annotation.RequestMapping;
      import org.springframework.web.bind.annotation.RequestMethod;

      public class ContinentController {
      @RequestMapping(value = "/continent.htm", method = RequestMethod.GET)
      public String continentForm(Model model)

      { Continent continent = new Continent(); model.addAttribute(continent); return "continent.jsp"; }

      @RequestMapping(value = "/continent.htm", method = RequestMethod.POST)
      public String continentForm(@ModelAttribute Continent continent,
      BindingResult bindingResult)

      { System.out.println(continent.getCountries()); // Here you can see the bug return "continent.jsp"; }


      <?xml version="1.0" encoding="UTF-8"?>
      <%@page contentType="text/html" pageEncoding="UTF-8" session="false"%>
      <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
      <%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
      <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="nl" lang="nl">
      <title>Continent example</title>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
      <form:form commandName="continent">
      <c:forEach items="${continent.countries}" var="entry">
      <form:label path="countries[${entry.key}]">${entry.key}</form:label>
      <form:input path="countries[${entry.key}]" />
      <form:errors path="countries[${entry.key}]" />
      <div><input type="submit" /></div>


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              • Assignee:
                juergen.hoeller Juergen Hoeller
                desmethans Hans Desmet
                Last updater:
                Spring Issuemaster
              • Votes:
                3 Vote for this issue
                8 Start watching this issue


                • Created:
                  Days since last comment:
                  5 weeks ago