How to use OWASP ZAP API's to run spider in java and display results?

how do we use OWASP ZAP API to run spider scan in java using Intelli J IDE? I went through OWASP ZAP documentation and couldn't figure it out

I tried the code on documentation, but i am not able to get scan report

package com.example.zaptry.ZapTry;
import org.zaproxy.clientapi.core.ApiResponse; 
import org.zaproxy.clientapi.core.ApiResponseElement;
import org.zaproxy.clientapi.core.ApiResponseList;
import org.zaproxy.clientapi.core.ClientApi;

import java.util.List;

public class first {

    private static final String ZAP_ADDRESS = "localhost";
    private static final int ZAP_PORT = 8080;
    // Change to match the API key set in ZAP, or use NULL if the API key is disabled
    private static final String ZAP_API_KEY = "r18e0j9pib9nqnke6l9hto2873";
    // The URL of the application to be tested
    private static final String TARGET = "https://public-firing-range.appspot.com";

    public static void main(String[] args) {
        ClientApi api = new ClientApi(ZAP_ADDRESS, ZAP_PORT, ZAP_API_KEY);

        try {
            // Start spidering the target
            System.out.println("Spidering target : " + TARGET);
            ApiResponse resp = api.spider.scan(TARGET, null, null, null, null);
            String scanID;
            int progress;

            // The scan returns a scan id to support concurrent scanning
            scanID = ((ApiResponseElement) resp).getValue();
            // Poll the status until it completes
            while (true) {
                Thread.sleep(1000);
                progress = Integer.parseInt(((ApiResponseElement) api.spider.status(scanID)).getValue());
                System.out.println("Spider progress : " + progress + "%");
                if (progress >= 100) {
                    break;
                }
            }
            System.out.println("Spider completed");
            // If required post process the spider results

            

            List<ApiResponse> spiderResults = ((ApiResponseList) api.spider.results(scanID)).getItems();


        } catch (Exception e) {
            System.out.println("Exception : " + e.getMessage());
            e.printStackTrace();
        }
    }
 }

the class name is first