将CDI注入FacesConverter [英] CDI Injection into a FacesConverter

问题描述

通过几次搜索，这似乎已经存在了一段时间.我写了一个FacesConverter，看起来像下面的样子.对象 Category 是一个JPA实体，而 CategoryControl 是获取它的DAO.

From just a few searches, this seems like a problem that has been around for a while. I have written a FacesConverter that looks like the following. The object Category is a JPA entity and CategoryControl is the DAO that fetches it.

@FacesConverter(value = "categoryConverter")
public class CategoryConverter implements Converter {

@Inject private CategoryControl cc;

public CategoryConverter() { }

@Override
public Object getAsObject(FacesContext context, UIComponent component, String value) {
    if (cc != null) return cc.getByName(value);
    System.out.println("CategoryConverter().getAsObject(): no injection!");
    return null;
}

@Override
public String getAsString(FacesContext context, UIComponent component, Object value) {
    if (!(value instanceof Category)) return null;
    return ((Category) value).getName();
}

}

您现在可能已经猜到了，我从来没有得到过注射.我从此页面(如下所示)中获得了解决方法:

As you probably guessed by now, I never get the injection. I got this workaround from this page, which looks like this.:

Workaround for this problem: create this method in your localeController: 

public Converter getConverter() 
{ 
    return   FacesContext.getCurrentInstance().getApplication().createConverter("localeConverter"); 
} 

and use converter="#{localeController.converter}" in your h:selectOneMenu.

但是我也无法完成这项工作.我的后备bean可以创建并返回一个转换器，但是它没有将对象注入其中.

However I can't make this work either. My backing bean creates and returns a converter all right, but it doesn't get the object injected into it.

我正在使用MyFaces CODI 1.0.1.使用当前的GlassFish/Weld容器.在我重新编码为不使用Converter之前，有人可以提出解决方案吗?

I am using MyFaces CODI 1.0.1. With the current GlassFish/Weld container. Can anyone suggest a solution before I re-code to not use a Converter?

推荐答案

替换

@FacesConverter(value = "categoryConverter")

作者

@Named

并使用

<h:inputSomething converter="#{categoryConverter}" />

或

<f:converter binding="#{categoryConverter}" />

代替

<h:inputSomething converter="categoryConverter" />

或

<f:converter converterId="categoryConverter" />

顺便说一句，@FacesConverter中的@EJB存在类似的问题.但是，它提供了JNDI手动抓取的方法.另请参见 JSF 2.0中的通信-在@FacesConverter中获取EJB和@FacesValidator .这样，您可以使用@FacesConverter(forClass=Category.class)，而无需每次都手动定义它.不幸的是，我无法从头顶上知道如何实现CDI bean.

By the way, similar problem exist for @EJB inside a @FacesConverter. It however offers a way to be grabbed by JNDI manually. See also Communication in JSF 2.0 - Getting an EJB in @FacesConverter and @FacesValidator. This way you can use a @FacesConverter(forClass=Category.class) without manually defining it everytime. Unfortunately I can't tell from top of head how to realize that for CDI beans.

更新:如果您恰巧使用JSF实用程序库 OmniFaces ，因为添加了1.6版透明支持在@FacesConverter类中使用@Inject和@EJB，而无需任何其他配置或注释.另请参见 CDI @FacesConverter展示示例.

Update: if you happen to use JSF utility library OmniFaces, since version 1.6 is adds transparent support for using @Inject and @EJB in a @FacesConverter class without any additional configuration or annotations. See also the CDI @FacesConverter showcase example.

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