About Question enthuware.jwpv6.2.582 :

[himaiMinh]

Let me add one more listener:

Any class annotated with WebListener must implement one or more of the ServletContextListener, ServletContextAttributeListener, ServletRequestListener, ServletRequestAttributeListener, HttpSessionListener or HttpSessionAttributeListener interface.

Let me add "as well as AsyncListener."

[admin]

JavaDoc description of this annotation doesn't mention AsyncListener: https://docs.oracle.com/javaee/6/api/ja ... tener.html

[johnlong]

Any class annotated with WebListener must implement one or more of the ServletContextListener, ServletContextAttributeListener, ServletRequestListener, ServletRequestAttributeListener, HttpSessionListener or HttpSessionAttributeListener interface.

Where did you get this requirement? Could you please indicate source?

[admin]

Any class annotated with WebListener must implement one or more of the ServletContextListener, ServletContextAttributeListener, ServletRequestListener, ServletRequestAttributeListener, HttpSessionListener or HttpSessionAttributeListener interface.

Where did you get this requirement? Could you please indicate source?

Section 8.1.4, Servlet 3.0 specification.

HTH
Paul.

[johnlong]

Thanks.

1. I have annotated my class @WebListener and my class implements AsyncListener and works fine.
2. Also I am able to annotate my class @WebListener not implementing any Listener interfaces at all.

[admin]

Some times servlet containers fail to adhere to the specification 100%. The reason could be a mistake or something that only they can tell.

[johnlong]

Ok, but then according to specification we cannot annotate AsyncListener as @WebListener?

[admin]

You can annotate any class with @WebListener if the class implements one of the valid interfaces for being a web listeners i.e. HttpServletListener, ContextListener etc.

[johnlong]

I am very sorry, I did not get your last explanation.