JSF的问题，希望那位可以指出问题所在

bingxue2332

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JSF Java Bean SUN JSP

backbean的所有代码

package org.hblz.common.web.jsf;
import javax.faces.component.html.HtmlSelectOneListbox;
import javax.faces.event.ValueChangeEvent;
import javax.faces.model.SelectItem;
import org.apache.log4j.Logger;
public class UserBean {
@SuppressWarnings("unused")
private static final Logger log = Logger.getLogger(UserBean.class);
private String message;
private SelectItem[] countyList = new SelectItem[0];
private Long countyId;
private HtmlSelectOneListbox countySelectList;
private SelectItem[] townList = new SelectItem[0];
private Long townId;
private HtmlSelectOneListbox townSelectList;
public void processCountySelectListChange(ValueChangeEvent event) {
this.message = "hello county!";
Long newValue = (Long) event.getNewValue();
townList = null;
townList = new SelectItem[10];
for (int i = 0; i < 10; i++) {
SelectItem st = new SelectItem(new Long(i), "Town No." + i
+ " of County No." + newValue.toString());
townList[i] = st;
}
}
public void processTownSelectListChange(ValueChangeEvent event) {
}
public Long getCountyId() {
return countyId;
}
public void setCountyId(Long countyId) {
this.countyId = countyId;
}
public SelectItem[] getCountyList() {
countyList = new SelectItem[30];
for (int i = 0; i < 30; i++) {
SelectItem st = new SelectItem(new Long(i), "No." + i);
countyList[i] = st;
}
return countyList;
}
public void setCountyList(SelectItem[] countyList) {
this.countyList = countyList;
}
public javax.faces.component.html.HtmlSelectOneListbox getCountySelectList() {
return countySelectList;
}
public void setCountySelectList(
javax.faces.component.html.HtmlSelectOneListbox countySelectList) {
this.countySelectList = countySelectList;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Long getTownId() {
return townId;
}
public void setTownId(Long townId) {
this.townId = townId;
}
public SelectItem[] getTownList() {
if (townList == null) {
townList = new SelectItem[0];
}
return townList;
}
public void setTownList(SelectItem[] townList) {
this.townList = townList;
}
public HtmlSelectOneListbox getTownSelectList() {
return townSelectList;
}
public void setTownSelectList(HtmlSelectOneListbox townSelectList) {
this.townSelectList = townSelectList;
}
}

配置文件很简单

xml version="1.0" encoding="UTF-8"?>
>
<faces-config>
<managed-bean>
<managed-bean-name>userBeanmanaged-bean-name>
<managed-bean-class>
org.hblz.common.web.jsf.UserBean
managed-bean-class>
<managed-bean-scope>requestmanaged-bean-scope>
managed-bean>
faces-config>

下面是JSP代码

xml 代码

<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSF 'hello.jsp' starting page</title>
</head>
<body>
<f:view>
<h:form>
<h:selectOneListbox id="countySelectList"
value="#{userBean.countyId}" binding="#{userBean.countySelectList}"
size="1" onchange="this.form.submit()"
valueChangeListener="#{userBean.processCountySelectListChange}"
immediate="true">
<f:selectItems value="#{userBean.countyList}" />
</h:selectOneListbox>
<h:selectOneListbox id="townSelectList" value="#{userBean.townId}"
binding="#{userBean.townSelectList}" size="1"
onchange="this.form.submit()"
valueChangeListener="#{userBean.processTownSelectListChange}"
immediate="true">
<f:selectItems value="#{userBean.townList}" />
</h:selectOneListbox>
<h:outputText value="#{userBean.message}"></h:outputText>
</h:form>
</f:view>
</body>
</html>

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struts直接转到action里面，在配置文件里面 ...

2007-04-19 23:47
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4 楼 snakeskin 2008-04-08

验证器出现了错误，在validate phase这个阶段，获得的下拉列表为空，所以验证失败，用session bean能解决这个问题

3 楼 penghao122 2007-04-20

断点跟踪一下。。

某些是空的

2 楼 jones 2007-04-20

表达式：#{userBean.countyId}计算的值没有包含在下拉列表的值中，
selectOneListbox是通过value值来确定那个被选中的，如果List提供的可选值中没有value属性指定的值就会 NoSuchElementException
这个异常是说value的值在控件所提供的选项中不存在具有这个值的选项的意思！

1 楼 bingxue2332 2007-04-19

问题是第一次打开和第一次操作都没有问题，但是当操作一次在下拉后就出现了错误，错误信息如下：
java.util.NoSuchElementException
javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:96)
javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:119)
javax.faces.component.UISelectOne.matchValue(UISelectOne.java:141)
javax.faces.component.UISelectOne.validateValue(UISelectOne.java:114)
javax.faces.component.UIInput.validate(UIInput.java:634)
javax.faces.component.UIInput.executeValidate(UIInput.java:838)
javax.faces.component.UIInput.processDecodes(UIInput.java:383)
javax.faces.component.UIForm.processDecodes(UIForm.java:144)
javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:872)
javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:306)
com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:79)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)

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