How to have multiple parameters using Spring MVC RequestMapping?

I am using Spring MVC RequestMapping here for GET parameters. Below is my code -

@RequestMapping(value = "index", method = RequestMethod.GET)
public HashMap<String, String> handleRequest(@RequestParam("dc1Servers") String dc1Servers) {
    HashMap<String, String> model = new HashMap<String, String>();
    String helloWorld = "Hello World!";
    model.put("greeting", helloWorld);

    System.out.println(dc1Servers);

    return model;
}

I am hitting this URL - http://127.0.0.1:8080/dataweb/index?dc1Servers=7 then it goes into the above code and prints out 7 on the console and works fine.

Now I would like to have these two below parameters as well -

dc2Servers=7
dc3Servers=7

So I made a method like this which can take three input parameters -

@RequestMapping(value = "index", method = RequestMethod.GET)
public HashMap<String, String> handleRequest(@RequestParam("dc1Servers") String dc1Servers, @RequestParam("dc2Servers") String dc2Servers, @RequestParam("dc3Servers") String dc3Servers) {
    HashMap<String, String> model = new HashMap<String, String>();
    String helloWorld = "Hello World!";
    model.put("greeting", helloWorld);

    System.out.println(dc1Servers);
    System.out.println(dc2Servers);
    System.out.println(dc3Servers);

    return model;
}

Now if I hit the url like this then it doesn't works -

http://127.0.0.1:8080/dataweb/index?dc1Servers=7?dc2Servers=7?dc3Servers=7

And it gives me some error.. Any idea what wrong I am doing here?