trying to generate automated login java code - webclient

Question

I have been trying to build a java program to perform automatic login to a web page but i am using the code below
import java.util.*;
import java.net.*;
import java.io.*;
import java.applet.*;
class main {
public static void main(String args[]) throws Exception{
final WebClient webClient = new WebClient();
// Fake page
final HtmlPage page1 = webClient.getPage("https://example/login.php");
// Get the form that we are dealing with and within that form,
// find the submit button and the field that we want to change.
final HtmlForm form = page1.getFormByName("login_form");
final HtmlSubmitInput button = form.getInputByName("Submit");
final HtmlTextInput username = form.getInputByName("username");
final HtmlTextInput psswd = form.getInputByName("password");
// Fake username and password
username.setValueAttribute("username");
psswd.setValueAttribute("password");
// Now submit the form by clicking the button and get back the second page.
final HtmlPage page2 = button.click();
}
}
but i had been getting the error WebClient not found, HTMLUnit not found.
Iam not using eclipse or any other kind similar to it. I am using Sublime text3 for writting the java code. Provide me with the correct import package to remove the errors. I had search the internet for this and had already downloaded HTMLUNIt packages from internet and put them in my enivronment path variable.