The file "jsf-impl-2.3.17.SP01.jar" contains the JSF taglibs. Eclipse needs them to validate e.g. taglib declarations in JSP files:

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>

Currently, you have to add this dependency to your custom pom.xml by declaring a version that matches the Wildfly bundled file:

          <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-impl</artifactId>
            <version>2.3.17.SP01</version>
            <scope>provided</scope>
        </dependency>

It would be helpful if the "wildfly-jakartaee8" bom already contained this dependency so that you can add it without version declaration.

Do you consider this request reasonable?