Getting blank response on invoking Rest API thur java code but thur postman working fine

In postman, I am calling a RestAPI. I have selected Basic Auth and passing username and password. It is working. I am getting response. But when I run it thru Java code and do authentication using Base64 encoding, I am getting blank response. Snapshots are attached below:

Calling RestAPI thru Postman

Java code to do the same is below:

public static String doPOSTCall(String postUrl, String authorization, JSONObject jo) throws Exception {
		String output = "";
		CloseableHttpClient httpClientPO = (HttpClients.createDefault());
		HttpPost httpPostPO = new HttpPost(postUrl);

		String auth = "ts_impl" + ":" + "Oracle@123";

		byte[] encodedAuth = Base64.encodeBase64(
				  auth.getBytes(StandardCharsets.ISO_8859_1));
				String authHeader = "Basic " + new String(encodedAuth);
				httpPostPO.setHeader(HttpHeaders.AUTHORIZATION, authHeader);
		
		
		//httpPostPO.setHeader("Authorization", authorization);
		httpPostPO.setHeader("content-type", "application/json");
		StringWriter out = new StringWriter();
		jo.writeJSONString(out);
		String reqJsonString = out.toString();

		System.out.println("json2 is " + reqJsonString);
		StringEntity entityPO = new StringEntity(reqJsonString);

		System.out.println("Request : " + httpPostPO);

		httpPostPO.setEntity(entityPO);

		HttpResponse responsePO = httpClientPO.execute(httpPostPO);
		HttpEntity entityFromResponse = responsePO.getEntity();

		if (entityFromResponse != null) {

			output = EntityUtils.toString(responsePO.getEntity());
			System.out.println(output);
		}

		return output;
	}

You can to create the encoded header like this:

String authHeader = "Basic " + Base64.getEncoder().encodeToString(auth.getBytes());

Use a simple REST Client, You can try the below code :

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.WebResource.Builder;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.api.json.JSONConfiguration; 
public class RestClient {
public static void main(String args[]){
String url = "Give-Your-URL-here";
String name = "username";
String password = "password";
String authorization = name + ":" + password;
JSONObject jo; // Create your Object 
// Do the necessary stuffs with the jo object, feeding data etc.
String response = doPOSTCall(url, String authorization, JSONObject jo);        
System.out.println("response: "+response);
}
public static String doPOSTCall(String postUrl, String authorization, JSONObject jo) throws Exception {
// Authentication Part
String authStringEnc = new BASE64Encoder().encode(authorization.getBytes());
System.out.println("Base64 encoded auth string: " + authStringEnc);
// JSON to String
StringWriter out = new StringWriter();
jo.writeJSONString(out);
String reqJsonString = out.toString();    
System.out.println("json2 is " + reqJsonString);
//REST calling
Client restClient = Client.create();
WebResource webResource = restClient.resource(url);
ClientResponse resp = webResource.accept("application/json")
.header("Authorization", "Basic " + authStringEnc)
.post(ClientResponse.class, reqJsonString);
// Response Verification
if(resp.getStatus() != 200){
System.err.println("Unable to connect to the server");
}
String output = resp.getEntity(String.class);
return output;
}
}

Update :

Maven Dependencies :    
<!-- https://mvnrepository.com/artifact/com.sun.jersey/jersey-client -->
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-client</artifactId>
<version>1.19.4</version>
</dependency>

Started working. The problem was that I was using http link in the code, where as it should have been https.