spring - org.springframework.beans.NotReadablePropertyException：bean 类的无效属性 Bean 属性不可读或具有无效的 getter 方法

Question

Spring MVC 对我来说是新的。我想有一些关于 Spring MVC 示例的综合文献（即使是官方文档也不容易理解）。

所以我面临的问题是：

Jun 15, 2013 2:42:36 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [appServlet] in context with path [/controller] threw exception [An exception occurred processing JSP page /WEB-INF/views/index.jsp at line 27

24: 
25: <form:form  commandName="creationDate" method="GET" action="add">
26: 
27: <form:label path="creationDate.ParticularDate">Particular Date</form:label>
28: <form:input path="creationDate.ParticularDate" />
29: 
30: <form:label path="creationDate.childGoSchoolDate">Child go to School</form:label>


Stacktrace:] with root cause
org.springframework.beans.NotReadablePropertyException: Invalid property 'creationDate' of bean class [edu.demidov.dom.CreationDate]: Bean property 'creationDate' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
    at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:707)
    at org.springframework.beans.BeanWrapperImpl.getNestedBeanWrapper(BeanWrapperImpl.java:554)
    at org.springframework.beans.BeanWrapperImpl.getBeanWrapperForPropertyPath(BeanWrapperImpl.java:531)
    at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:697)
    at org.springframework.validation.AbstractPropertyBindingResult.getActualFieldValue(AbstractPropertyBindingResult.java:99)
    at org.springframework.validation.AbstractBindingResult.getFieldValue(AbstractBindingResult.java:218)
    at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:120)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:179)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:199)
    at org.springframework.web.servlet.tags.form.LabelTag.autogenerateFor(LabelTag.java:130)
    at org.springframework.web.servlet.tags.form.LabelTag.resolveFor(LabelTag.java:120)
    at org.springframework.web.servlet.tags.form.LabelTag.writeTagContent(LabelTag.java:90)
    at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:103)
    at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80)
    at org.apache.jsp.WEB_002dINF.views.index_jsp._jspx_meth_form_005flabel_005f0(index_jsp.java:184)
    at org.apache.jsp.WEB_002dINF.views.index_jsp._jspx_meth_form_005fform_005f0(index_jsp.java:128)
    at org.apache.jsp.WEB_002dINF.views.index_jsp._jspService(index_jsp.java:88)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:264)
    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:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)

为什么会这样？我不明白为什么它说我的实体没有适当的 setter 和 getter 方法，而且我认为我不必在我的控制器类中定义它们。我对吗？

我的控制器：

@Autowired
    private ControllerSupportClass controllerSupportClass; 


        public void setControllerSupportClass(
                ControllerSupportClass controllerSupportClass) {
            this.controllerSupportClass = controllerSupportClass;
        }


        @RequestMapping(value ="/index", method=RequestMethod.GET)
        public ModelAndView firstPage(Model model) {

            CreationDate creationDate = new CreationDate();
            model.addAttribute("creationDate", creationDate);


            return new ModelAndView("index");
        }


        @RequestMapping(value ="/result", method=RequestMethod.GET)
        public String SecondActionPage(@RequestParam String particularDate, 
                                       @RequestParam String nameOfInstitution, 
                                       @RequestParam String typeName, 
                                       Model model) throws Exception {


                if(particularDate !="" && nameOfInstitution !="" && typeName=="") {

                    controllerSupportClass.findWithDateAndName(nameOfInstitution, particularDate, model);

                } else if(particularDate !="" && nameOfInstitution =="" && typeName !="") {

                    controllerSupportClass.findWithAddedDateAndType(typeName, particularDate, model);

                } else if(particularDate !="" && nameOfInstitution =="" && typeName==""){

                    controllerSupportClass.findWithAddedDate(particularDate, model);

                } else if(particularDate !="" && nameOfInstitution !="" && typeName !="") {

                    throw new Exception("Search by choose all parameters is not exceptable");

                } else {

                    throw new Exception("You didn't put any search parameters");

                }


            return "result";

        }

        @RequestMapping(value="/add", method=RequestMethod.GET)
        public String addingData(@ModelAttribute("creationDate") CreationDate creationDate, BindingResult result, Model model) {


            controllerSupportClass.saveDataToDataBase(creationDate);

            return "add";

        }

}

还有我的jsp：

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="utf-8"%>

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>    

<!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=utf-8">
<title>Sorting page</title>
</head>

<body>

<h3>Insert data:</h3>

<form:form  commandName="CreationDate" method="GET" action="add">

<form:label path="creationDate.particularDate">Particular Date</form:label>
<form:input path="creationDate.particularDate" />

<form:label path="creationDate.childGoSchoolDate">Child go to School</form:label>
<form:input path="creationDate.childGoSchoolDate"/>


<form:label path="creationDate.childAdmissionDate">Child admission Date</form:label>
<form:input path="creationDate.childAdmissionDate"/>

<input type="submit" value="Save"/>

</form:form>

</body>

</html>

是的，我的 CreationDate 实体：

@Entity
@Table(name="CREATION_DATE")
@NamedQueries ({
@NamedQuery(name="creationDate.findById", query="select distinct c from CreationDate c left join fetch c.institution n " +
                                                  "left join fetch c.scheduleRotationChild s where c.dateId= :i")
})
public class CreationDate implements Serializable {


    private static final long serialVersionUID = 1648102358397071136L;


    private int dateId;

        @Id
        @GeneratedValue(strategy=IDENTITY)
        @Column(name="DATE_ID")
        public int getDateId() {
            return dateId;
        }

        public void setDateId(int dateId) {
            this.dateId = dateId;
        }


    private Date particularDate;

        @Column(name="PARTICULAR_DATE")
        public Date getParticularDate() {
            return particularDate;
        }

        public void setParticularDate(Date particularDate) {
            this.particularDate = particularDate;
        }


    private int version;

        @Version
        @Column(name="VERSION")
        public int getVersion() {
            return version;
        }

        public void setVersion(int version) {
            this.version = version;
        }


    private Date childGoSchoolDate;

        @Temporal(TemporalType.DATE)
        @Column(name="CHILD_GO_SCHOOL_DATE")
        public Date getChildGoSchoolDate() {
            return childGoSchoolDate;
        }

        public void setChildGoSchoolDate(Date childGoSchoolDate) {
            this.childGoSchoolDate = childGoSchoolDate;
        }


    private Date childAdmissionDate;

        @Temporal(TemporalType.DATE)
        @Column(name="CHILD_ADMISSION_DATE")
        public Date getChildAdmissionDate() {
            return childAdmissionDate;
        }

        public void setChildAdmissionDate(Date childAdmissionDate) {
            this.childAdmissionDate = childAdmissionDate;
        }


    private Set<Institution> institution = new HashSet<Institution>();

        @ManyToMany(fetch = FetchType.LAZY)
        @Cascade(org.hibernate.annotations.CascadeType.ALL)
        @JoinTable(name="CREATIONDATE_INSTITUTION", 
                                    joinColumns=@JoinColumn(name="DATE_ID"), 
                                    inverseJoinColumns=@JoinColumn(name="INSTITUTION_ID"))
        public Set<Institution> getInstitution() {
            return institution;
        }

        public void setInstitution(Set<Institution> institutionSet) {
            this.institution = institutionSet;
        }


    private List<ScheduleRotationChild> scheduleRotationChild = new ArrayList<ScheduleRotationChild>();

        @OneToMany(fetch=FetchType.EAGER, orphanRemoval=true)
        @Cascade(org.hibernate.annotations.CascadeType.ALL)
        @JoinTable(name="SRC_DATE", 
                                    joinColumns=@JoinColumn(name="DATE_ID"),
                                    inverseJoinColumns=@JoinColumn(name="SRC_ID"))
        public List<ScheduleRotationChild> getScheduleRotationChild() {
            return scheduleRotationChild;
        }

        public void setScheduleRotationChild(
                List<ScheduleRotationChild> scheduleRotationChild) {
            this.scheduleRotationChild = scheduleRotationChild;
        }





        public void addSetInstitutions(Set<Institution> institution) {

            setInstitution(institution);

        }


        public void addSRC(List<ScheduleRotationChild> srcinstitution) {

        setScheduleRotationChild(srcinstitution);

        }



        public String toString() {

            return "\n" + "ID: " + dateId + " \n " 
            + "Дата: " +particularDate + " \n " 
            + "Дети идут в школу, год: " + childGoSchoolDate + " \n " 
            + "Дата приема детей: " + childAdmissionDate + "  " + scheduleRotationChild + " \n " ;

        }


}

我希望这能向你们澄清我的问题。谢谢你。

score 7 · Accepted Answer

和标签中的path值应该相对于. 换句话说，值应该是对象类的属性名称。基本上只是删除前缀，所以你最终得到这个：form:labelform:inputform:formpathcreationDatecreationDate.

<form:form  commandName="creationDate" method="GET" action="add">

<form:label path="particularDate">Particular Date</form:label>
<form:input path="particularDate" />

<form:label path="childGoSchoolDate">Child go to School</form:label>

假设该类具有称为和的creationDate属性（带有 getter/setter）。particularDatechildGoSchoolDate

score 1 · Accepted Answer

里面的path属性creationDate.ParticularDate大概应该是creationDate.particularDate.

确保您的CreationDate对象具有正确的属性 getter 方法#getParticularDate()。

score 1 · Accepted Answer

我遇到了同样的问题，但问题是我没有生成 getter 和 setter，我手动将它们写下来。我所有的路径和方法都是正确的。所以我删除了我手动编写的getter和setter方法，并使用eclipse生成它们。我不明白它背后的逻辑，但这解决了我的问题。

score 0 · Accepted Answer

0

Command表单标签中提到的路径变量错过了类。

于 2018-11-23T10:38:22.647 回答

score 0 · Accepted Answer

对于 bean，提供具有正确名称的 getter 很重要。比如说，如果某个类将您的类视为一个 bean 并想要访问属性 boxType，则必须提供一个不带 args 的 getter getBoxType()。有一个关于吸气剂名称的合同。“get” + 大写字母 (B) + 属性名称的其余部分。您可能有一个公共属性 boxType，但就 bean 而言它是无用的。您需要从 getter 中的该字段返回值。自动生成的 getter 通常是可以的，但对于布尔值，某些 IDE 添加“is”而不是“get”。

spring - org.springframework.beans.NotReadablePropertyException：bean 类的无效属性 Bean 属性不可读或具有无效的 getter 方法

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