如何注入@FacesConverter？ [英] How can I inject in @FacesConverter?

问题描述

我写了一个转换器。我正在使用CDI和注入并行。在这种情况下，类不会被注入。如何使注射成为可能？

  @FacesConverter（forClass = MyClass.class）
 
 public MyConverter类实现转换器{
 
 @EJB 
 private ClassForEJB classForEJB; 
 
 @Inject 
 private ClassForInject classForInject; 
 
 //转换方法
} 
  

解决方案

@FacesConverter 不是符合条件的注射目标。将其替换为 @ManagedBean 或 @Named 。如果您想使用CDI，请使用 @Named 。

  @Named 
 @ApplicationScoped //我假设你的转换器没有任何状态。 
 public class MyConverter实现转换器{
 // ... 
} 
  

您只需更改视图中引用的方式即可。你不能依赖 forClass 。您需要明确指定为＃{myConverter} 。

 < h：inputSomething ... converter =＃{myConverter}/> 
  

或

 < h：inputSomething ...> 
< f：转换器绑定=＃{myConverter}/> 
< / h：inputSomething> 
  

如果您真的需要保留 @FacesConverter 赞成 forClass ，那么你需要手动抓取EJB的JNDI。 此博客文章中显示了一个具体示例。然而，我可以告诉CDI bean。

JSF的人已经确认了这个令人尴尬的监督，他们将使 @FacesConverter 即将到来的 JSF 2.2中的合格注入目标，另见 JSF规格问题763 JSF 2.3。

另请参见：

• 如何注入@EJB，@PersistenceContext，@Inject，@Autowired等在@ FacesConverter？

---

更新恰好使用JSF实用程序库 OmniFaces ，或者开放使用它，因为它的版本1.6，当在中有OmniFaces JAR时， / WEB-INF / lib ，全部 @FacesConverter s（和 @FacesValidator s）在你的webapp 自动无需任何额外的努力即可获得CDI和EJB注入资格。

I wrote a converter. I am using CDI and injection parallel. In that case the classes are not injected. How can I make the injection possible?

@FacesConverter(forClass = MyClass.class)

public class MyConverter implements Converter{

    @EJB
    private ClassForEJB classForEJB;

    @Inject
    private ClassForInject classForInject;

// Converter Methods
}

解决方案

The @FacesConverter isn't an eligible injection target. Replace it by @ManagedBean or @Named. As you'd like to use CDI as as well, use @Named.

@Named
@ApplicationScoped // I assume that your converter doesn't have any state.
public class MyConverter implements Converter {
    // ...
}

You only need to change the way it's been referenced in the views. You cannot rely on forClass anymore. You'd need to explicitly specify it as #{myConverter}.

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

or

<h:inputSomething ...>
    <f:converter binding="#{myConverter}" />
</h:inputSomething>

If you really need to keep the @FacesConverter in favor of forClass, then you'd need to grab the EJB manually by JNDI. A concrete example is shown in this blog article. I can however not tell that for CDI beans.

The JSF guys have confirmed this embarrassing oversight and they will make the @FacesConverter an eligible injection target in upcoming JSF 2.2, see also JSF spec issue 763 JSF 2.3.

See also:

• How to inject @EJB, @PersistenceContext, @Inject, @Autowired, etc in @FacesConverter?

---

Update if you happen to use JSF utility library OmniFaces, or are open to using it, since its version 1.6, when just having OmniFaces JAR in /WEB-INF/lib, all @FacesConverters (and @FacesValidators) in your webapp automatically become eligible for CDI and EJB injection without any extra effort.

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