Spring Boot Restful API Generate QR Code as Base64 String

implementation group: 'com.google.zxing', name: 'core', version: '3.4.1'
implementation group: 'com.google.zxing', name: 'javase', version: '3.4.1'

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.4.1</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.4.1</version>
</dependency>

package dev.simplesolution.restqrcodebase64.service;

public interface QRCodeService {
    String generateQRCodeBase64(String qrCodeContent, int width, int height);
}

package dev.simplesolution.restqrcodebase64.service.impl;

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;
import dev.simplesolution.restqrcodebase64.service.QRCodeService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Base64;

@Service
public class QRCodeServiceImpl implements QRCodeService {

    private Logger logger = LoggerFactory.getLogger(QRCodeServiceImpl.class);

    @Override
    public String generateQRCodeBase64(String qrCodeContent, int width, int height) {
        try {
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            BitMatrix bitMatrix = qrCodeWriter.encode(qrCodeContent, BarcodeFormat.QR_CODE, width, height);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            MatrixToImageWriter.writeToStream(bitMatrix, "PNG", byteArrayOutputStream);
            String qrCodeBase64 = Base64.getEncoder().encodeToString(byteArrayOutputStream.toByteArray());
            return qrCodeBase64;
        } catch (WriterException ex) {
            logger.error("Error during generate QR Code", ex);
        } catch (IOException ex) {
            logger.error("Error during generate QR Code", ex);
        }
        return null;
    }
}

package dev.simplesolution.restqrcodebase64.controller;

import dev.simplesolution.restqrcodebase64.service.QRCodeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class QRCodeController {
    private static final int WIDTH = 500;
    private static final int HEIGHT = 500;

    @Autowired
    private QRCodeService qrCodeService;

    @GetMapping("/generate-qr-code-base64")
    public ResponseEntity<String> generateQRCodeBase64() {
        String contentToGenerateQrCode = "Simple Solution";
        String qrCodeBase64 = qrCodeService.generateQRCodeBase64(contentToGenerateQrCode, WIDTH, HEIGHT);
        return ResponseEntity.ok().contentType(MediaType.TEXT_PLAIN).body(qrCodeBase64);
    }
}