org.springframework.beans.NotReadablePropertyException：Bean类[java.lang.String]的无效属性'idValue'：

Question

我有一个下拉列表，它是我在控制器中生成的值，并将该值传递给我的jsp页面。我在“form：options”标签的“itemValue”属性中收到以下异常。 为什么我需要itemValue的getter setter，因为不过我对我的“typeCode”有价值。 但为了避免混淆，我还为idValue添加了getter setter，但仍然收到相同的错误。请帮助。

JSP：

<% 
Map LCCLSTypeCode = (Map) request.getAttribute("LCCLSTypeCode"); 
System.out.println("LCCLSTypeCode:"+LCCLSTypeCode); 
%> 

<form:form action="/tradelc/ClsSave" method="POST" onsubmit="return CheckPassword()"> 
. 
. 
. 
. 
. 
<form:select path="typeCode"> 
<form:options items="<%=LCCLSTypeCode%>" itemValue="idValue" itemLabel="displayValue"/>  
</form:select> 

. 
. 
. 
<a href="javascript:submitPageX();">Create</a> 

<script> 
function submitPageX() 
{ 
document.forms[0].submit(); 
      return false; 
} 

控制器：

@Controller 
@SessionAttributes("clsData") 
public class InformLoginAction{ 
@ModelAttribute("clsData") 
    public ClauseData createBean() { 
     return new ClauseData(); 
    } 

@RequestMapping(value = "/informlogin", method = RequestMethod.GET) 
    public ModelAndView execute(HttpServletRequest request, 
           HttpServletResponse response, 
           @ModelAttribute("clsData") ClauseData clauseData, 
           BindingResult bindingResult) 
     throws Exception { 
. 
. 
. 
. 
Map newMap = new HashMap(); 
while(enu!=null && enu.hasMoreElements()) 
     { 
newMap.put(omxComboBean.assignId(item.trim()),omxComboBean.assignValue(text)); 
ModelAndView modelAndView = new ModelAndView(); 
     modelAndView.setViewName("menu1"); 
     modelAndView.addObject("command", new ClauseData());//Specifying the bean 
     modelAndView.addObject("LCCLSTypeCode", newMap);//Specifying the value for the dropdown 
     return modelAndView; 
} 
} 

OmxComboBean.java：

public String assignId(String id) 
    { 
     idValue = id; 
     return id; 
    } 

    public String assignValue(String value) 
    { 
     displayValue = value; 
     return value; 
    } 

Bean类ClauseData.java：

public class ClauseData { 
private String typeDesc; 
private String idValue; 
public String getTypeCode(){return typeCode;} 
    public void setTypeCode(String typeCode){this.typeCode = typeCode;} 
public String getIdValue(){return idValue;} 
    public void setIdValue(String idValue){this.idValue = idValue;} 
} 

例外：

org.springframework.beans.NotReadablePropertyException: Invalid property 'idValue' of bean class [java.lang.String]: Bean property 'idValue' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter? 
    org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:723) 
    org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:714) 
    org.springframework.web.servlet.tags.form.OptionWriter.renderFromMap(OptionWriter.java:166) 
    org.springframework.web.servlet.tags.form.OptionWriter.writeOptions(OptionWriter.java:136) 
    org.springframework.web.servlet.tags.form.OptionsTag.writeTagContent(OptionsTag.java:155) 
    org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:84) 

Answer 1

你的控制器看起来应该像这样

@RequestMapping(value = "/informlogin", method = RequestMethod.GET) 
public ModelAndView execute(HttpServletRequest request,HttpServletResponse response,@ModelAttribute("clsData") ClauseData clauseData,BindingResult bindingResult, ModelMap model) throws Exception { 
    model.addAttribute("command", clauseData); // not modelAndView.addObject 
    model.addAttribute("LCCLSTypeCode", map); 
    ... 
    return new ModelAndView("view name"); 
} 

，这里是jsp页面

<form:form action="/tradelc/ClsSave" method="POST" onsubmit="return CheckPassword()" path="command"> 
... 
<form:select path="idValue"> 
    <form:options items="${LCCLSTypeCode}"/> <!-- you should not use scriptlet and once map has been attached to ModelMap you don't need to retrive it mannually by scriptlet -->  
</form:select> 
... 
<a href="javascript:submitPageX();">Create</a>