我正在创建的网站有问题。我是 Faces 2.0 的新手，只使用 JSP，现在转向 Faces 2.0。我有一个添加和删除位置邮政编码的页面。编辑部分有效，但添加部分，我有一个错误：
PropertyNotFoundException, Target Unreachable, 'null' returned null.
关于以下值：
value="#{zipCodeMaintennanceBean.selectedZipCode.description}"
我不知道为什么它不起作用，因为编辑部分起作用并且它们使用相同的 ManagedBean。
我正在使用带有 Hibernate 和 PrimeFaces 3.5 的 Spring 3.1.3。我希望有人回答我的问题，因为我不知道如何解决这个问题。
我怀疑每当我单击按钮时，都会创建一个新对象，因为我正在使用 @RequestScoped 注释。
我试图在@PostConstruct 方法上实例化实体类，甚至在声明中实例化实体并在描述中设置一个空字符串，但没有任何效果。
它没有调用 save() 方法，并且似乎卡在了更新模型值阶段
下面是我的 xhtml 页面：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui"
xmlns:c="http://java.sun.com/jsp/jstl/core">
<ui:composition template="/WEB-INF/views/template.xhtml">
<ui:define name="content">
<table border="0" width="100%">
<tr align="center">
<td><c:if test="${not empty param.login_error}">
<div class="error"
style="font-family: serif; font-size: medium; color: red;">
#{msg['label.login.invalidlogon']}<br />
#{sessionScope.SPRING_SECURITY_LAST_EXCEPTION.message}
</div>
</c:if> <c:if test="">
<div class="message"
style="font-family: serif; font-size: medium; color: red;">
${sessionScope.messageVariable}</div>
</c:if> </td>
</tr>
</table>
<p:panelGrid columns="3">
<h:form id="form">
<f:facet name="header">
<p:row>
<p:column colspan="3">#{msg['usrmnt.header']}</p:column>
</p:row>
</f:facet>
<p:row>
<p:column>
<h:outputLabel for="userSearch" value="Search ZipCode/Description" />
</p:column>
<p:column>
<p:inputText styleClass="new-fld" id="userSearch"
value="#{zipCodeMaintennanceBean.searchString}">
</p:inputText>
</p:column>
<p:column>
<p:commandButton value="#{msg['usrmnt.searchbutton']}"
actionListener="#{zipCodeMaintennanceBean.search}"
update="panel,dataTable" process="@form" />
<p:commandButton value="Add"
actionListener="#{zipCodeMaintennanceBean.triggerAdd}"
update="panel,:#{p:component('displayadd')}"
oncomplete="addDialog.show()" />
</p:column>
</p:row>
<p:row>
<p:column colspan="3" styleClass="ui-widget-header">
<p:spacer height="0" />
</p:column>
</p:row>
<p:row>
<p:column colspan="3">
<p:outputPanel id="panel">
<p:dataTable id="dataTable" var="zip"
value="#{zipCodeMaintennanceBean.zipCodes}" paginator="true"
rows="10"
paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
rowsPerPageTemplate="5,10,15"
rendered="#{zipCodeMaintennanceBean.hasSearchResult}"
selectionMode="single"
selection="#{zipCodeMaintennanceBean.selectedZipCode}"
rowKey="#{zip.zipcode}">
<p:ajax event="rowSelect"
listener="#{zipCodeMaintennanceBean.onRowSelect}"
oncomplete="editDialog.show()"
update=":#{p:component('display')}" />
<p:ajax event="rowUnselect"
listener="#{zipCodeMaintennanceBean.onRowUnselect}" />
<f:facet name="header">
Users
</f:facet>
<p:column>
<f:facet name="header">
<h:outputText value="Zip Code" />
</f:facet>
<h:outputText value="#{zip.zipcode}" />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Description" />
</f:facet>
<h:outputText value="#{zip.description}" />
</p:column>
</p:dataTable>
</p:outputPanel>
</p:column>
</p:row>
<p:dialog header="Add ZipCode" widgetVar="addDialog" id="addDialog"
modal="true" showEffect="clip" hideEffect="fold" dynamic="true">
<p:outputPanel autoUpdate="true">
<p:panelGrid cellpadding="4" id="displayadd"
rendered="#{zipCodeMaintennanceBean.addMode}"
styleClass="maintennancePanelGrid">
<f:facet name="header">
<p:row>
<p:column colspan="3">
<h:outputText value="Add Zip Code" />
</p:column>
</p:row>
</f:facet>
<p:row>
<p:column>
<h:outputLabel for="zipcodeAdd" value="Zip Code:" />
</p:column>
<p:column>
<p:inputText styleClass="new-fld" id="zipcodeAdd"
value="#{zipCodeMaintennanceBean.selectedZipCode.zipcode}"
label="Zip Code" required="true">
<f:validateLength for="userName" minimum="4" maximum="6"></f:validateLength>
</p:inputText>
</p:column>
<p:column>
<p:message for="zipcodeAdd"></p:message>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel for="descriptionAdd" value="Description: " />
</p:column>
<p:column>
<p:inputText styleClass="new-fld" id="descriptionAdd"
required="true"
value="#{zipCodeMaintennanceBean.selectedZipCode.description}"
label="Description"></p:inputText>
</p:column>
<p:column>
<p:message for="descriptionAdd"></p:message>
</p:column>
</p:row>
<f:facet name="footer">
<p:row>
<p:column styleClass="text-align:center" colspan="3">
<p:commandButton value="Submit"
update=":#{p:component('displayadd')}"
action="#{zipCodeMaintennanceBean.add}"
oncomplete="if (!args.validationFailed) addDialog.hide()" process="@form" />
</p:column>
</p:row>
<p:row>
<p:column colspan="3">
</p:column>
</p:row>
</f:facet>
</p:panelGrid>
</p:outputPanel>
</p:dialog>
<p:dialog header="Edit ZipCode" resizable="false" id="editDialog"
widgetVar="editDialog" modal="true" showEffect="clip"
hideEffect="fold" closeOnEscape="true" dynamic="true">
<p:outputPanel autoUpdate="true">
<p:panelGrid cellpadding="4" id="display"
rendered="#{zipCodeMaintennanceBean.hasSelectedZipCode}"
styleClass="maintennancePanelGrid">
<f:facet name="header">
<p:row>
<p:column colspan="3">
<h:outputText value="Edit Zip Code" />
</p:column>
</p:row>
</f:facet>
<p:row>
<p:column>
<h:outputLabel for="zipcode" value="Zip Code:" />
</p:column>
<p:column>
<p:inputText styleClass="new-fld" id="zipcode"
value="#{zipCodeMaintennanceBean.selectedZipCode.zipcode}"
label="Zip Code" disabled="true">
<f:validateLength for="userName" minimum="4" maximum="6"></f:validateLength>
</p:inputText>
</p:column>
<p:column>
<p:message for="zipcode"></p:message>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel for="descripton" value="Description: " />
</p:column>
<p:column>
<p:inputText styleClass="new-fld" id="description"
required="true"
value="#{zipCodeMaintennanceBean.selectedZipCode.description}"
label="Description"></p:inputText>
</p:column>
<p:column>
<p:message for="description"></p:message>
</p:column>
</p:row>
<f:facet name="footer">
<p:row>
<p:column styleClass="text-align:center" colspan="3">
<p:commandButton value="Submit"
update="panel,:#{p:component('display')}"
action="#{zipCodeMaintennanceBean.save}"
oncomplete="if (!args.validationFailed) editDialog.hide()" />
<p:commandButton value="Delete"
update="panel,:#{p:component('display')}"
action="#{zipCodeMaintennanceBean.delete}"
oncomplete="if (!args.validationFailed) editDialog.hide()"
process="@this">
</p:commandButton>
<p:confirmDialog global="true" showEffect="fade"
hideEffect="explode">
<p:commandButton value="Yes" type="button"
styleClass="ui-confirmdialog-yes" icon="ui-icon-check" />
<p:commandButton value="No" type="button"
styleClass="ui-confirmdialog-no" icon="ui-icon-close" />
</p:confirmDialog>
</p:column>
</p:row>
<p:row>
<p:column colspan="3">
</p:column>
</p:row>
</f:facet>
</p:panelGrid>
</p:outputPanel>
</p:dialog>
</h:form>
</p:panelGrid>
</ui:define>
</ui:composition>
</html>
下面是我的支持 Bean：
package com.siteam.web.bean;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;
import org.primefaces.event.SelectEvent;
import org.primefaces.event.UnselectEvent;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import com.siteam.web.invsys.dao.ZipCodeDao;
import com.siteam.web.invsys.entities.TblZipcodes;
@ManagedBean(name = "zipCodeMaintennanceBean")
@RequestScoped
@Service
public class ZipCodeMaintennanceBean {
private TblZipcodes selectedZipCode = new TblZipcodes();
private boolean hasSelectedZipCode = false;
private List<TblZipcodes> zipCodes = new ArrayList<TblZipcodes>();
private ZipCodeDao zipCodeDao;
private boolean hasSearchResult = false;
private String searchString;
private boolean addMode;
public void triggerAdd() {
init();
this.addMode = true;
}
public String add() {
try {
this.selectedZipCode.setDateupdated(Calendar.getInstance()
.getTime());
this.zipCodeDao.add(this.selectedZipCode);
this.zipCodeDao.refresh(this.selectedZipCode);
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_INFO, "Zip Code Saved. ",
"Saved Zip Code"));
context.getExternalContext().getFlash().setKeepMessages(true);
init();
this.addMode = false;
return "zipmnt";
} catch (DataIntegrityViolationException ex) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_WARN, "Error:",
"ZipCode Already Exists"));
ex.printStackTrace();
return "";
} catch (NullPointerException npe) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_ERROR, "Error:", npe.getMessage()));
npe.printStackTrace();
return "";
} catch (Throwable th) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_ERROR, "Error:", th.getCause()
.getMessage()));
th.printStackTrace();
return "";
}
}
public String save() {
try {
this.selectedZipCode.setDateupdated(Calendar.getInstance()
.getTime());
this.zipCodeDao.update(this.selectedZipCode);
this.zipCodeDao.refresh(this.selectedZipCode);
FacesContext context = FacesContext.getCurrentInstance();
init();
// RequestContext.getCurrentInstance().execute("editDialog.hide()");
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_INFO, "Zip Code Saved. ",
"Saved Zip Code"));
context.getExternalContext().getFlash().setKeepMessages(true);
hasSearchResult = false;
this.hasSelectedZipCode = false;
return "zipmnt";
} catch (DataIntegrityViolationException ex) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_WARN, "Error:",
"ZipCode Already Exists"));
ex.printStackTrace();
return "";
} catch (NullPointerException npe) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_ERROR, "Error:", npe.getMessage()));
npe.printStackTrace();
return "";
} catch (Throwable th) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_ERROR, "Error:", th.getCause()
.getMessage()));
th.printStackTrace();
return "";
}
}
public String delete() {
try {
this.zipCodeDao.delete(this.selectedZipCode);
FacesContext context = FacesContext.getCurrentInstance();
init();
// RequestContext.getCurrentInstance().execute("editDialog.hide()");
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_INFO, "Zip Code Deleted. ",
"Deleted Zip Code"));
context.getExternalContext().getFlash().setKeepMessages(true);
hasSearchResult = false;
this.hasSelectedZipCode = false;
return "zipmnt";
} catch (DataIntegrityViolationException ex) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_WARN, "Error:",
"ZipCode Already Exists"));
ex.printStackTrace();
return "";
} catch (NullPointerException npe) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_ERROR, "Error:", npe.getMessage()));
npe.printStackTrace();
return "";
} catch (Throwable th) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_ERROR, "Error:", th.getCause()
.getMessage()));
th.printStackTrace();
return "";
}
}
@PostConstruct
public void init() {
this.hasSelectedZipCode = false;
this.hasSearchResult = false;
this.addMode = false;
this.selectedZipCode = new TblZipcodes();
this.selectedZipCode.setDescription("");
this.zipCodes.clear();
}
public void search() {
hasSearchResult = false;
TblZipcodes zipCode = new TblZipcodes();
zipCode.setZipcode(searchString);
this.zipCodes = zipCodeDao.findZipCodes(zipCode);
if (zipCodes.size() > 0) {
hasSearchResult = true;
}
}
public TblZipcodes getSelectedZipCode() {
return selectedZipCode;
}
public void setSelectedZipCode(TblZipcodes selectedZipCode) {
this.selectedZipCode = selectedZipCode;
}
public boolean isHasSelectedZipCode() {
return hasSelectedZipCode;
}
public void setHasSelectedZipCode(boolean hasSelectedZipCode) {
this.hasSelectedZipCode = hasSelectedZipCode;
}
public List<TblZipcodes> getZipCodes() {
return zipCodes;
}
public void setZipCodes(List<TblZipcodes> zipCodes) {
this.zipCodes = zipCodes;
}
public ZipCodeDao getZipCodeDao() {
return zipCodeDao;
}
@Autowired
public void setZipCodeDao(ZipCodeDao zipCodeDao) {
this.zipCodeDao = zipCodeDao;
}
public boolean isHasSearchResult() {
return hasSearchResult;
}
public void setHasSearchResult(boolean hasSearchResult) {
this.hasSearchResult = hasSearchResult;
}
public String getSearchString() {
return searchString;
}
public void setSearchString(String searchString) {
this.searchString = searchString;
}
public void onRowSelect(SelectEvent event) {
this.selectedZipCode = (TblZipcodes) event.getObject();
FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_INFO,
"Selected Zip Code", "Zip Code Selected: "
+ selectedZipCode.getZipcode());
zipCodeDao.refresh(this.selectedZipCode);
FacesContext.getCurrentInstance().addMessage(null, msg);
this.hasSelectedZipCode = true;
}
public void onRowUnselect(UnselectEvent event) {
// FacesMessage msg = new FacesMessage("Car Unselected", ((Car)
// event.getObject()).getModel());
this.selectedZipCode = new TblZipcodes();
this.hasSelectedZipCode = false;
}
public boolean isAddMode() {
return addMode;
}
public void setAddMode(boolean addMode) {
this.addMode = addMode;
}
}
以下是我的邮政编码实体代码
package com.siteam.web.invsys.entities;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name = "TBL_ZIPCODES", schema = "INVSYS")
public class TblZipcodes implements java.io.Serializable {
private String zipcode;
private String description = "";
private Date dateupdated;
private Set<TblCustomer> tblCustomers = new HashSet<TblCustomer>(0);
public TblZipcodes() {
}
public TblZipcodes(String zipcode) {
this.zipcode = zipcode;
}
public TblZipcodes(String zipcode, String description, Date dateupdated,
Set tblCustomers) {
this.zipcode = zipcode;
this.description = description;
this.dateupdated = dateupdated;
this.tblCustomers = tblCustomers;
}
@Id
@Column(name = "ZIPCODE", unique = true, nullable = false, length = 5)
public String getZipcode() {
return this.zipcode;
}
public void setZipcode(String zipcode) {
this.zipcode = zipcode;
}
@Column(name = "DESCRIPTION", length = 50)
public String getDescription() {
return this.description;
}
public void setDescription(String description) {
this.description = description;
}
@Temporal(TemporalType.DATE)
@Column(name = "DATEUPDATED", length = 7)
public Date getDateupdated() {
return this.dateupdated;
}
public void setDateupdated(Date dateupdated) {
this.dateupdated = dateupdated;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "tblZipcodes")
public Set<TblCustomer> getTblCustomers() {
return this.tblCustomers;
}
public void setTblCustomers(Set<TblCustomer> tblCustomers) {
this.tblCustomers = tblCustomers;
}
@Override
public boolean equals(Object newObject) {
return newObject instanceof TblZipcodes;
}
// This must return the same hashcode for every Foo object with the same key.
public int hashCode() {
return this.getClass().hashCode();
}
}
先感谢您。