NotReadablePropertyException：無效的屬性 'MODULENAME' bean類的

Question

我收到以下異常在Spring MVC應用程序：

org.springframework.beans.NotReadablePropertyException: Invalid property 'moduleName' of bean class  [java.lang.String]: Bean property 'moduleName' 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:726) 
org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:717) 
org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:149) 

JSP代碼

<form:form method="post" action="/submitSurvey" modelAttribute="surveyModule" > 
<form:label path="moduleName">Module Name</form:label> 
<form:input path="moduleName" /> 
<input type="submit" value="Save"/> 
</form:form> 

春季控制器

@RequestMapping(value = "/submitSurvey", method = RequestMethod.POST) 
public String submitSurvey(@ModelAttribute("surveyModule")SurveyModule sm, Model model){ 
    surveyService.setSurveyModule(sm); 
    return "surveyHome"; 
} 

豆：SurveyModule.java

@Entity 
@Table(name="SURVEYMODULE") 
public class SurveyModule { 

@Id 
@Column(name="SurveyModuleId") 
@GeneratedValue(strategy=GenerationType.IDENTITY) 
private Integer surveyModuleId; 
private String moduleName; 

public Integer getSurveyModuleId() { 
    return surveyModuleId; 
} 
public void setSurveyModuleId(Integer surveyModuleId) { 
    this.surveyModuleId = surveyModuleId; 
} 
public String getModuleName() { 
    return moduleName; 
} 
public void setModuleName(String moduleName) { 
    this.moduleName = moduleName; 
} 
} 

酒店MODULENAME存在於bean類。雖然我能夠使用該屬性來獲取數據，但爲什麼我得到這個錯誤？我該如何解決這個問題？

Answer 1

請注意，錯誤說

Invalid property 'moduleName' of bean class  [java.lang.String] 

這意味着ElResolver解決surveyModule爲字符串而不是作爲一個SurveyModule類。這意味着有相同的密鑰分配，這是導致你的問題。請您使用其它型號存儲鍵屬性或會話，還要檢查有沒有<c:set var="surveyModule"在你的頁面