Custom error pages not showing up? - html

Question

I have Tomcat installed and whenever the user hits a 404 pages or 500 page it shows the Tomcats error page. But, then I have created a custom 404 and 500 error pages and put it inside my web.xml file. But, I can't see my custom error page displayed. Please check my code and see what is going on. Thank you for the help.
Here is my code:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Production</param-value>
</context-param>
<context-param>
<param-name>report.url</param-name>
<param-value>https://MY_URL_LINK.net/jasperserver-pro/rest_v5/reports/organizations/organization_2</param-value>
</context-param>
<context-param>
<param-name>report.path.mode</param-name>
<param-value>report.path</param-value>
</context-param>
<context-param>
<param-name>report.path.test</param-name>
<param-value>C:\\Program Files\\glassfish-4.1\\glassfish\\domains\\domain1\\applications\\PayApp-5.0-SNAPSHOT\\reports\\</param-value>
</context-param>
<context-param>
<param-name>report.path</param-name>
<param-value>/usr/share/glassfish3/glassfish/domains/domain1/applications/PayApp/reports/</param-value>
</context-param>
<!-- THIS IS MY ERROR PAGES SHOWN BELOW -->
<error-page>
<!-- Missing resource -->
<error-code>404</error-code>
<location>/Error404.xhtml</location>
</error-page>
<error-page>
<!-- Uncaught exception -->
<error-code>500</error-code>
<location>/Error500.xhtml</location>
</error-page>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
25
</session-timeout>
</session-config>
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>org.pay.filters.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>/secure/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.xhtml</welcome-file>
</welcome-file-list>
<resource-ref>
<res-ref-name>/oracleInstance</res-ref-name>
<res-type>javax.sql.ConnectionPoolDataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
<resource-ref>
<res-ref-name>jdbc/w2Instance</res-ref-name>
<res-type>javax.sql.ConnectionPoolDataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
</web-app>