How does classpath represent the root directory in this way of use in spring - Codes Helper

1. Problem description
the project is built using maven, and the configuration files are placed under src/main/resources.
because there are frequent changes to the web.xml configuration during project development, the project manager uses variables (sso.path) to specify external profiles, each using a local profile.
but the problem is that when I want to switch to the configuration in the src/main/resources directory again, I don"t know what to say (you can comment it all, of course, but there are more changes).
if there is a subdirectory, it"s a good indication, such as classpath:/spring, but my configuration files are all in the root directory. I"ve tried classpath: classpath:/ and classpath://, in a mess, and it doesn"t seem to work.
ask for advice! Thanks!

2. The code is as follows
configuration in web.xml

    <context-param>
        <!--  -->
        <param-name>sso.path</param-name>
        <!-- src/main/resouces -->
        <param-value>file:f:/config</param-value>
    </context-param>
    
    <listener>
        <listener-class>cn.xx.xx.api.sso.listener.ConfigContextListener</listener-class>
    </listener>

ConfigContextListener implementation

public class ConfigContextListener implements ServletContextListener{
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        String path = sce.getServletContext().getInitParameter("sso.path");
        //
        System.setProperty("sso.path", path);    
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        
    }
}

use: for example, in spring-redis.xml (and many configuration files use this variable)

    <context:property-placeholder location="${sso.path}/spring/redis.properties"
        ignore-unresolvable="true" />