相关疑难解决方法(0)

我有一个ap:selectOneMenu的问题,无论我做什么我都无法让JSF调用JPA实体上的setter.JSF验证失败,显示以下消息:

form:location:验证错误:值无效

我有这个工作在几个相同类型的其他类(即,连接表类),但不能为我的生活让这一个工作.

如果有人可以针对此类问题提出一些故障排除/调试技巧,我们将不胜感激.

使用日志语句我已经验证了以下内容:

1. 在Conveter将返回正确的,非null数值.
2. 我的JPA实体中没有Bean验证.
3. setLocation(Location location)永远不会调用setter .

这是我能做的最简单的例子,它根本不起作用:

<h:body>
    <h:form id="form">
        <p:messages id="messages" autoUpdate="true" />
        <p:selectOneMenu id="location" value="#{locationStockList.selected.location}" converter="locationConverter">
            <p:ajax event="change" update=":form:lblLocation"/>
            <f:selectItems value="#{locationStockList.locationSelection}"/>
        </p:selectOneMenu>
    </h:form>
</h:body>

转换器:

@FacesConverter(forClass=Location.class, value="locationConverter")
public class LocationConverter implements Converter, Serializable {
    private static final Logger logger = Logger.getLogger(LocationConverter.class.getName());

    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        if (value.isEmpty())
            return null;
        try {
            Long id = Long.parseLong(value);
            Location location = ((LocationManagedBean) context.getApplication().getELResolver().getValue(context.getELContext(), null, "location")).find(id);
            logger.log(Level.SEVERE, …

大家现在我正在使用JSF 2.0和EJB3,我使用Primefaces显示错误消息或成功消息,我有两个问题是当我把Button sumit(JSF命令按钮)下一页错误显示

/register.xhtml @ 26,172 value ="#{userController.user.username}":目标无法访问,'null'返回null

我的代码是

用户实体

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.demoejb.entity;

import java.io.Serializable;
import java.util.Date;
import java.util.List;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

/**
 *
 * @author KencyWindy
 */
@Entity
@Table(name = "iuser")
@NamedQueries({
    @NamedQuery(name = …