相关疑难解决方法(0)

定义View Params之间有什么区别:

<f:metadata>
  <f:viewParam name="id" value="#{someBean.id}"/>
</f:metadata>

并在ManagedBean中定义属性,如下所示:

@ManagedProperty(value = "#{param.id}")
private Integer id;

我有一个CDI托管bean,我想将请求参数设置为托管属性:

import javax.inject.Named;
import javax.enterprise.context.RequestScoped;

@Named
@RequestScoped
public class ActivationBean implements Serializable {

    @ManagedProperty(value="#{param.key}")
    private String key;

    @ManagedProperty(value="#{param.id}")
    private Long id;

    // Getters+setters

domain/activate.jsf?key=98664defdb2a4f46a527043c451c3fcd&id=5但是,URL是永远不会设置和保留的属性null.

这是怎么造成的,我该如何解决？

我知道我可以从ExternalContext下面手动抓取它们:

Long id = Long.parseLong(FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("id"), 10);
String key = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("key");

但是,我宁愿使用注射剂.

玻璃鱼错误

INFO: Initializing Mojarra 2.1.6 (SNAPSHOT 20111206) for context '/NNTPjsf'
INFO: WEB0671: Loading application [NNTPjsf] at [/NNTPjsf]
SEVERE: Exception while loading the app
INFO: only once...
INFO: NNTP.loadMessages...
SEVERE: Exception while loading the app : WELD-001408 Unsatisfied dependencies for type [FacesContext] with qualifiers [@Default] at injection point [[field] @Inject net.bounceme.dur.nntp.HttpParamProducer.facesContext]
org.jboss.weld.exceptions.DeploymentException: WELD-001408 Unsatisfied dependencies for type [FacesContext] with qualifiers [@Default] at injection point [[field] @Inject net.bounceme.dur.nntp.HttpParamProducer.facesContext]
    at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:274)
    at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:243)
    at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:106)
    at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:126)
    at org.jboss.weld.bootstrap.Validator.validateBeans(Validator.java:345)
    at org.jboss.weld.bootstrap.Validator.validateDeployment(Validator.java:330)
    at org.jboss.weld.bootstrap.WeldBootstrap.validateBeans(WeldBootstrap.java:366) …

我对于同一主题提出了另一个问题仍犹豫不决,但至少现在我正在阅读正确的文档.

所以,这堂课:

class FacesContextProducer {
   @Produces @RequestScoped FacesContext getFacesContext() {
      return FacesContext.getCurrentInstance();
   }
}

事实上,从焊接文档中,此方法适用于Glassfish: GlassFish使用WELD作为JSR-299的参考实现:Java上下文的Java上下文和依赖注入(CDI).

对于上面的课程,它会在哪里使用？为什么你需要一个单独的类@Produces一个FacesContext？