On July 27, 2018 1:53:40 AM UTC, Huxing Zhang <hux...@apache.org> wrote:

<snip/>

>What if the listener isn't in control, e.g. the listener class is in a
>3rd party library.
>In some cases, a listener may not allow multiple instances, if the
>second listener start, it will fail.

Raise a bug against the 3rd party library?

>Is it possible to add a new method in ServletContext called
>getListeners(), and let the user to decide whether to add it or not?

Yes, but we can't do that. We can't change the Servlet API. I suggest opening 
an issue against the Servlet API to make a change in the next version.

Mark

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