web.xml

<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    
    <servlet>
        <display-name>index</display-name>
        <servlet-name>index</servlet-name>
        <jsp-file>/index.jsp</jsp-file>
    </servlet>
    
    <security-constraint>
        <web-resource-collection>
            <web-resource-name>SecurityConstraint</web-resource-name>
            <url-pattern>*.jsp</url-pattern>
        </web-resource-collection>
        <auth-constraint>
            <role-name>g1</role-name>
        </auth-constraint>
        <user-data-constraint>
            <transport-guarantee>NONE</transport-guarantee>
        </user-data-constraint>
    </security-constraint>
    
    <login-config>
        <auth-method>FORM</auth-method>
        <realm-name>file</realm-name>
        <form-login-config>
            <form-login-page>/loginform.jsp</form-login-page>
            <form-error-page>/loginerror.jsp</form-error-page>
        </form-login-config>
    </login-config>
    
    <security-role>
        <role-name>g1</role-name>
    </security-role>
</web-app>