Why does congif.getinitparameter("driver") returns null?

See more:

J2EE

JSP

config

ConfigObject.jsp

<% out.print("Driver : "+config.getInitParameter("driver")); %>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" 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">
    
    <servlet>
        <servlet-name>config</servlet-name>
        <jsp-file>/ConfigObject.jsp</jsp-file>
        <init-param>
            <param-name>driver</param-name>
            <param-value>com.mysql.cj.jdbc.Driver</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>config</servlet-name>
        <url-pattern>/config</url-pattern>
    </servlet-mapping>
</web-app>

Output
Driver : null

What I have tried:

I tried to get the servlet name using config.getServletName() , it worked fine.
But I couldn't figure out why config.getInitParameter("driver") returns null. Suggestions are welcome and thanks in advance:)