error: package javax.servlet does not exist

Question

I was trying to implement a login filter in my web app with jsf 2, following this guide:

https://stackoverflow.com/tags/servlet-filters/info

after I compiled

Answer 1

The answer provided by @Matthias Herlitzius is mostly correct. Just for further clarity.

The servlet-api jar is best left up to the server to manage see here for detail

With that said, the dependency to add may vary according to your server/container. For example in Wildfly the dependency would be

    org.jboss.spec.javax.servlet
    jboss-servlet-api_3.1_spec
    provided

So becareful to check how your container has provided the servlet implementation.