import java.net.URL;
import java.net.URLConnection;
import javax.xml.bind.DatatypeConverter;
import java.io.IOException;
import java.net.MalformedURLException;

public class Temp{

    public static void main(String[] args){

        URL url = null;
        try {
                  url = new URL("http://localhost:15672/api/traces/%2f/my-trace");
        } catch (MalformedURLException e) {
                 System.out.println("MalformedUrlException: " + e.getMessage());
                 e.printStackTrace();
        }

    URLConnection uc = null;
    try {
        uc = url.openConnection();
    uc.setRequestProperty("Content-Type", "application/json");
    uc.setRequestProperty("format","json");
    uc.setRequestProperty("pattern","#");
    } catch (IOException e) {
        System.out.println("IOException: " + e.getMessage());
        e.printStackTrace();
    }

    String userpass = "guest" + ":" + "guest";
    String basicAuth = "Basic " + javax.xml.bind.DatatypeConverter.printBase64Binary(userpass.getBytes());

    uc.setRequestProperty ("Authorization", basicAuth);
    }
}