@ManagedProperty with request parameter not set in a @Named bean

Question

I\'ve a CDI managed bean wherein I\'d like to set request parameters as managed properties:

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


        

Answer 1

The JSF-specific @ManagedProperty annotation works only in JSF managed beans, not in CDI managed beans. In other words, it works only in classes annotated with JSF-specific @ManagedBean annotation, not in classes annotated with CDI-specific @Named annotation.

CDI does not offer an annotation out the box to inject specifically a HTTP request parameter. JSF utility library OmniFaces offers a @Param annotation for the very purpose of injecting a HTTP request parameter in a CDI managed bean.

@Inject @Param
private String key;

@Inject @Param
private Long id;

Alternatively, use the <f:viewParam> tag in the view.

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

See also

• ViewParam vs @ManagedProperty(value = "#{param.id}")
• How do I process GET query string URL parameters in backing bean on page load?