Looking for logging into the Filter Example site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Filter Example site. After that you can login as usual with your login credentials.
https://stackoverflow.com/questions/13274279/authentication-filter-and-servlet-for-login
https://www.journaldev.com/1933/java-servlet-filter-example-tutorial
https://examples.javacodegeeks.com/enterprise-java/servlet/java-servlet-filter-example/
https://www.ibm.com/support/knowledgecenter/SS7K4U_9.0.0/com.ibm.websphere.zseries.doc/ae/tsec_servlet.html
http://javaonlineguide.net/2014/12/servlet-filters-in-java-with-login-filter-example-how-to-configure-web-xml-for-servlet-filters.html
http://www.itcuties.com/j2ee/jsf-2-login-filter-example/
https://codenotfound.com/jsf-login-servlet-filter-example.html
https://www.javatpoint.com/authentication-filter
https://www.baeldung.com/spring-security-custom-filter
https://www.youtube.com/watch?v=hBvabd47Cc8
https://medium.com/@kasunpdh/session-management-in-java-using-servlet-filters-and-cookies-7c536b40448f
https://github.com/itcuties/JSF2-Login-Filter-Example
https://dzone.com/articles/ee-servlet-3-developing-user