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JSF @ ListenerFor / @ ListenersFor annotation does not work

JSF @ListenerFor annotations do not work with GlassFish or Tomcat. No errors or warnings. It just does not call the processEvent () method.

@ListenersFor({@ListenerFor(systemEventClass=PostConstructApplicationEvent.class), 
public class MySystemEventListener implements SystemEventListener {

   @Override
   public void processEvent(SystemEvent event) throws AbortProcessingException {
      if(event instanceof PostConstructApplicationEvent){
         System.out.println("*********************************************");
         System.out.println("processEvent Method is Called: PostConstructApplicationEvent");
         System.out.println("*********************************************");
      }

      if(event instanceof PreDestroyApplicationEvent){
         System.out.println("*********************************************");
         System.out.println("processEvent Method is Called: PreDestroyApplicationEvent");
         System.out.println("*********************************************");
      }
}

   @Override
   public boolean isListenerForSource(Object o) {
      return (o instanceof Application);
   }

}

With an idea?

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1 answer

According to javadoc , it @ListenerForintends to be included in the implementation UIComponentor Renderer, rather than in a standalone implementation SystemEventListener. For the latter you need to register it as <system-event-listener>in faces-config.xml.

eg.

<application>
    <system-event-listener>
        <system-event-listener-class>com.example.MySystemEventListener</system-event-listener-class>
        <system-event-class>javax.faces.event.PostConstructApplicationEvent</system-event-class>
        <system-event-class>javax.faces.event.PreDestroyApplicationEvent</system-event-class>
    <system-event-listener>
</application>

For a specific functional requirement, you might want to use the expected initialized bean application instead. This is somewhat simpler and does not require some verbose XML:

@ManagedBean(eager=true)
@ApplicationScoped
public void App {

    @PostConstruct
    public void init() {
        // ...
    }

    @PreDestroy
    public void destroy() {
        // ...
    }

}
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