How to configure the log4j output file path in web.xml and log4j.properties?

I have developed a web application where i can register a employee.

My web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

  <display-name>Employee Registration</display-name>

  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

  <servlet>
  <servlet-name>sapient</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
  <servlet-name>sapient</servlet-name>
  <url-pattern>*.htm</url-pattern>
  </servlet-mapping>

</web-app>

Now when I click on a Register Button in my html page. It goes to a controller class where I have wrote a code for logging,

@org.springframework.stereotype.Controller
public class RegController  {
    private static final Logger LOGGER = Logger
            .getLogger(RegController.class.getName());


@RequestMapping(value = "/register.htm", method = RequestMethod.GET)
public ModelAndView handleRequest(HttpServletRequest request,
        HttpServletResponse response) throws Exception {
    LOGGER.debug("ENTERING the contoller class");
    ModelAndView mav = new ModelAndView("register");
    LOGGER.debug("exiting the contoller class");
    return mav;

}

}

I have created a package called resource and have created a log4j.properties file in

# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAp