[
{
    "attributeId": 12345,
    "attributeTitle": "Hello World",
    "someNumber": null,
    "totalAmount": 20,
    "emailList": [
        "emp1725@xxmail.com",
        "emp3399@xxmail.com",
        "emp9125@xxmail.com",
        "emp9978@xxmail.com",
    ]
},
{
    "attributeId": 23456,
    "attributeTitle": "Hello America",
    "someNumber": null,
    "totalAmount": 30,
    "emailList": [
        "dmp1725@xxmail.com",
        "dmp3399@xxmail.com",
        "dmp9125@xxmail.com",
        "dmp9978@xxmail.com",
    ]
},
{
    "attributeId": 34567,
    "attributeTitle": "Hello Texas",
    "someNumber": null,
    "totalAmount": 40,
    "emailList": [
        "bng1725@xxmail.com",
        "bng3399@xxmail.com",
        "bng9125@xxmail.com",
        "bng9978@xxmail.com",
    ]
},
{
    "attributeId": 45678,
    "attributeTitle": "Hello California",
    "someNumber": null,
    "totalAmount": 50,
    "emailList": [
        "wtm1725@xxmail.com",
        "wtm3399@xxmail.com",
        "wtm9125@xxmail.com",
        "wtm9978@xxmail.com",
    ]
}

enter code here
import java.util.ArrayList;

public class CmsObject {
    private String attributeId;
    private String attributeTitle;
    private String someNumber;
    private int totalAmount;
    private ArrayList<String> emails = new ArrayList<>();

   //Getters & Settors.... (Used Eclipse to Generate)
}

@Component
public class CmsNotiHandler {
    public void handler() {
        String restURL = System.getenv("nRestUrl");
        RestTemplate restTemplate = new RestTemplate();
        ParameterizedTypeReference<List<CmsObject>> listOffrn = new
        ParameterizedTypeReference<List<CmsObject>>() {
        };

    ResponseEntity<List<CmsObject>> cmsResponse
            = restTemplate.exchange(restURL, HttpMethod.GET, new
    HttpEntity<>(getHeaders()), listOffrn);
    List<CmsObject> cmsList = cmsResponse.getBody();

    for (CmsObject cc : cmsList) {
        System.out.println("Email List Size: " + cc.getEmails().size());
    }
}
private static HttpHeaders getHeaders() {
    String restServiceUsername = System.getenv("username");
    String restServicePassword = System.getenv("password");
    StringBuilder plainCredentials = new StringBuilder();
    plainCredentials.append(restServiceUsername).append(":")
        .append(restServicePassword);
    String base64Credentials = new
    String(Base64Utils.encode(plainCredentials.toString()
        .getBytes(StandardCharsets.UTF_8)));
    HttpHeaders headers = new HttpHeaders();
    headers.add(AUTHORIZATION, "Basic " + base64Credentials);
    headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
    return headers;
}