ManagedProperty未注入@FacesConverter [英] ManagedProperty not injected in @FacesConverter

问题描述

  @ManagedBean 
 @RequestScoped 
我试图在我的Faces中注入ManagedBean 
 @FacesConverter（forClass = Group.class）
 public class GroupConverter implements Converter {
 
 @ManagedProperty（＃{groupService}）
 private GroupService groupService; 
 
 @Override 
 public Group getAsObject（FacesContext context，UIComponent arg1，
 String groupName）{
 return groupService.findGroupByName（groupName）; 
} 
 
 @Override 
 public String getAsString（FacesContext arg0，UIComponent arg1，Object group）{
 return（（Group）group）.getName（）; 
} 
 
 public GroupService getGroupService（）{
 return groupService; 
} 
 
 public void setGroupService（GroupService groupService）{
 this.groupService = groupService; 
} 
 
} 
  

问题是groupService isn'我被注入，我得到一个NullPointerEx。不应该自动连线，因为它也是一个ManagedBean？当我将getAsObject更改为返回新的Group（）;

任何想法？

解决方案

很可能你没有解决托管bean名称。

  @ManagedBean（name =myConverter）
 @RequestScoped 
 @FacesConverter（value =myConverter ）
 public class MyConverter实现转换器{
  

例如，考虑这两个组件： / p>

 < h：inputText converter =myConvertervalue =＃{foo.prop}/> 
< h：inputText converter =＃{myConverter}value =＃{bar.prop}/> 
  

当转换器设置在第一个组件上时，它将由 Application.createConverter 。 转换器不是托管bean 。如果您匹配按类型转换。

在第二个组件中，值表达式用于返回实现Converter 。这使用通常的托管bean机制。在这种情况下， @FacesConverter 注释是无关紧要的。

I'm trying to inject a ManagedBean in my FacesConverted the following way:

@ManagedBean
@RequestScoped
@FacesConverter(forClass = Group.class)
public class GroupConverter implements Converter {

@ManagedProperty("#{groupService}")
private GroupService groupService;

@Override
public Group getAsObject(FacesContext context, UIComponent arg1,
        String groupName) {
    return groupService.findGroupByName(groupName);
}

@Override
public String getAsString(FacesContext arg0, UIComponent arg1, Object group) {
    return ((Group) group).getName();
}

public GroupService getGroupService() {
    return groupService;
}

public void setGroupService(GroupService groupService) {
    this.groupService = groupService;
}

}

The problem is that groupService isn't being injected and I get a NullPointerEx. Shouldn't it be autowired automatically since it's also a ManagedBean? It all works when I change "getAsObject" to "return new Group();" obviously.

Any ideas?

解决方案

It is likely that you are not resolving the managed bean name.

@ManagedBean(name = "myConverter")
@RequestScoped
@FacesConverter(value = "myConverter")
public class MyConverter implements Converter {

For example, consider these two components:

        <h:inputText converter="myConverter" value="#{foo.prop}" />
        <h:inputText converter="#{myConverter}" value="#{bar.prop}" />

When the converter is set on the first component, it will be created by Application.createConverter. A converter is not a managed bean. The same rules apply if you match a converter by type.

In the second component, a value expression is used to return a class that implements Converter. This uses the usual managed bean mechanisms. In this case, the @FacesConverter annotation is irrelevant.

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