import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

public class QRCodeGenerator {
    //public static final String QR_CODE_IMAGE_PATH = "./MyQRCode.png";

    public static void generateQRCodeImage(String text, int width, int height, String filePath)
            throws WriterException, IOException {
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);

        Path path = FileSystems.getDefault().getPath(filePath);
        MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);
    }

}

public PetController{
    public void createQRFromPet(String name, String value) throws URISyntaxException {
        final String QR_CODE_IMAGE_PATH = "C:\Users\user\Documents\workspace-sts-3.9.0.RELEASE\TrackPetService\WebContent\QRcodes\MyQRCode"+value+".png";
        try {
            QRCodeGenerator.generateQRCodeImage(getPet(name, value).toString(), 350, 350, QR_CODE_IMAGE_PATH);
        } catch (WriterException e) {
            System.out.println("Could not generate QR Code, WriterException :: " + e.getMessage());
        } catch (IOException e) {
            System.out.println("Could not generate QR Code, IOException :: " + e.getMessage());
        }
    }
}

import java.net.URISyntaxException;
import com.mongodb.DBObject;
import com.service.controllers.PetController;

    public class Main {


        public static void main(String[] args) throws URISyntaxException {

            PetController pc = new PetController();
            pc.createQRFromPet("name","Peppon");
            }
    }

<dependencies>
      <!-- https://mvnrepository.com/artifact/com.sun.jersey/jersey-bundle -->
    <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-bundle</artifactId>
        <version>1.19</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.ws.rs/jsr311-api -->
    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>jsr311-api</artifactId>
        <version>1.1.1</version>
    </dependency>

    <!-- Official Mongo Driver -->
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongodb-driver</artifactId>
        <version>3.0.4</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mongodb/bson -->
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>bson</artifactId>
        <version>3.0.4</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mongodb/mongodb-driver-core -->
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongodb-driver-core</artifactId>
        <version>3.0.4</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.2</version>
    </dependency>

    <!-- Zxing library start -->
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.0</version>
    </dependency>

    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.3.0</version>
    </dependency>
    <!-- Zxing library end -->

  </dependencies>