The code snippet uses the following maven dependencies:

  <dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>httpclient</artifactId>
   <version>4.5.7</version>
  </dependency>

  <dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>httpcore</artifactId>
   <version>4.4.11</version>
  </dependency>

  <dependency>
   <groupId>commons-logging</groupId>
   <artifactId>commons-logging</artifactId>
   <version>1.2</version>
  </dependency>

//Code snippet to consume Product Code builder API using Java

//load required libraries
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.util.Date;

public class PcbRestClient {
	/*************************************************************************************************************************
    //This is example of a complete Java class that uses Apache HttpClient to make a POST request to a REST API
    *************************************************************************************************************************/
    public static void main(String[] args) throws IOException {
          
        CloseableHttpClient httpClient = HttpClients.createDefault();
        
        //create a signature and append it to the URL to avoid cached responses from server.
        Long signature = generateSignature();
        
        //set the URI
        HttpPost httpPost = new HttpPost("https://www.accessdata.fda.gov/rest/pcbapi/v1/product/name/?signature="+signature);
        System.out.println(httpPost.getURI());
        
        //add the headers
        httpPost.addHeader("Authorization-User", "Insert your Authorization-User here");
        httpPost.addHeader("Authorization-Key", "Insert your Authorization-Key here");
        httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded");
        
        //build the payload
        httpPost.setEntity(new StringEntity("payload=blood/plasma"));
        
        //execute the post request
        HttpResponse httpResponse = httpClient.execute(httpPost);
        
        //process the response received
        String responseBody = EntityUtils.toString(httpResponse.getEntity());
        System.out.println(responseBody);

        httpClient.close();
    }
   
    private static long generateSignature() {
    	Date date = new Date();
    	long signature = date.getTime();
    	return signature;
    }
}