spring - 構成できません内部鬼ごっこ

Question

JSP で Spring フォームタグライブラリを使用しています。コマンドオブジェクトにリストが含まれており、JSP でリストの各オブジェクトのバインディングを作成したいと考えています。しかし、STS は次のことを示す例外を私に与えます:

Bean プロパティ 'testList[0]' が読み取れないか、無効なゲッターメソッドがあります: ゲッターの戻り値の型は、セッターのパラメーターの型と一致しますか?]

完全な例外コードは次のとおりです。

SEVERE: Servlet.service() for servlet [appServlet] in context with path [/mvc] threw exception [org.springframework.beans.NotReadablePropertyException: Invalid property 'testList[0]' of bean class [java.util.ArrayList]: Bean property 'testList[0]' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?] with root cause
org.springframework.beans.NotReadablePropertyException: Invalid property 'testList[0]' of bean class [java.util.ArrayList]: Bean property 'testList[0]' 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:729)
    at org.springframework.beans.BeanWrapperImpl.getNestedBeanWrapper(BeanWrapperImpl.java:576)
    at org.springframework.beans.BeanWrapperImpl.getBeanWrapperForPropertyPath(BeanWrapperImpl.java:553)
    at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:719)
    at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:147)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:178)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:198)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:164)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:151)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:142)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:126)
    at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:421)
    at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142)
    at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:102)
    at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79)
    at org.apache.jsp.WEB_002dINF.views.test_jsp._jspx_meth_form_005finput_005f0(test_jsp.java:217)
    at org.apache.jsp.WEB_002dINF.views.test_jsp._jspx_meth_c_005fforEach_005f0(test_jsp.java:167)
    at org.apache.jsp.WEB_002dINF.views.test_jsp._jspx_meth_form_005fform_005f0(test_jsp.java:122)
    at org.apache.jsp.WEB_002dINF.views.test_jsp._jspService(test_jsp.java:82)
    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: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:722)
    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:262)
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    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.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    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)

ここに私の .jsp ページがあります:

<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
    <title>Home</title>
</head>
<body>
<h1>
    Hello!
</h1>
<form:form action="saveStudent" method="POST" modelAttribute = "testList">

    <c:forEach items="${testList}" var="test" varStatus="pStatus">
    Test Question: <form:input path = "testList[${pStatus.index}].testQuestion" value = "${test.testQuestion}"/>
    Option one: <form:input path = "testList[${pStatus.index}].optionOne" value= "${test.optionOne}"/>
    Option two: <form:input path = "testList[${pStatus.index}].optionTwo" value= "${test.optionTwo}"/>
    Option three: <form:input path = "testList[${pStatus.index}].optionThree" value= "${test.optionThree}"/>
    </c:forEach>

<input type="submit" value="Submit" />
</form:form>
</body>
</html>

これが私のメソッドコードです:

@RequestMapping(value = "/test", method = RequestMethod.GET)
public String redactTest(Model model, HttpServletRequest request) {

    List<Test> testList = db.getTests();
    model.addAttribute("testList", testList);

    return "test";
}

私が間違っているのは何ですか？助言がありますか？ありがとう！

OK、解決策があります。最初に、get と set を含む List を含む TestWrapper クラスを追加しました。

public class TestWrapper {

    private List<Test> testList = null;

    public TestWrapper(List<Test> testList) {

        this.testList = testList;
    }

    public void setTestList(List<Test> testList) {

        this.testList = testList;
    }

    public List<Test> getTestList() {

        return testList;
    }

}

次に、メソッドコードを変更しました。

@RequestMapping(value = "/test", method = RequestMethod.GET)
public String redactTest(Model model, HttpServletRequest request) {

    List<Test> testList = db.getTests();
    TestWrapper testWrapper = new TestWrapper(testList);

    model.addAttribute("testWrapper", testWrapper);

    return "test";
}

そして、.jsp を変更した後:

<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
    <title>Home</title>
</head>
<body>
<h1>
    Hello!
</h1>
<form:form action="saveStudent" method="POST" modelAttribute = "testWrapper">

    <c:forEach items="${testWrapper.testList}" var="test" varStatus="i">
        Test Question: <form:input path = "testList[${i.index}].testQuestion" value = "${test.testQuestion}"/>
        Option one: <form:input path = "testList[${i.index}].optionOne" value= "${test.optionOne}"/>
        Option two: <form:input path = "testList[${i.index}].optionTwo" value= "${test.optionTwo}"/>
        Option three: <form:input path = "testList[${i.index}].optionThree" value= "${test.optionThree}"/>
    </c:forEach>

<input type="submit" value="Submit" />
</form:form>
</body>
</html>

そして今、それは機能します！それが誰かを助けることを願っています:)

spring - 構成できません内部鬼ごっこ

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