Javaweb gerando QR code

Olá amigos java, estou começando no fantástico mundo dos códigos e estou criando uma aplicação web que gera QRCode porém estava acompanhando um tutorial https://www.youtube.com/watch?v=TV4RcnBY_SU e fiz tudo igual ao professor e não deu certo, não sei lidar com erros java ainda mas alguém pode me dar uma força nesse erro em específico? att
package com.myapp.struts;

import java.io.ByteArrayOutputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.swing.JOptionPane;

import net.glxn.qrgen.QRCode;

import net.glxn.qrgen.image.ImageType;

/**
*

• @author Ana
  */
  public class QRCodeSwing extends javax.swing.JFrame {

  /**

  • Creates new form QRCode
    */
    public QRCodeSwing() {
    initComponents();
    }

  /**

  • This method is called from within the constructor to initialize the form.

  • WARNING: Do NOT modify this code. The content of this method is always

  • regenerated by the Form Editor.
    
    */
    
    @SuppressWarnings(“unchecked”)
    
    // 
    
    private void initComponents() {
    

    jPanel1 = new javax.swing.JPanel();
    
    jScrollPane1 = new javax.swing.JScrollPane();
    
    textoParaQRCode = new javax.swing.JTextArea();
    
    btnGerar = new javax.swing.JButton();
    
    btnLimpar = new javax.swing.JButton();
    
    jLabel1 = new javax.swing.JLabel();
    

    setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
    getContentPane().setLayout(null);

    jPanel1.setBackground(new java.awt.Color(255, 255, 255));
    jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());

    textoParaQRCode.setColumns(20);
    
    textoParaQRCode.setRows(5);
    
    jScrollPane1.setViewportView(textoParaQRCode);
    

    btnGerar.setText(“Gerar QR Code”);
    
    btnGerar.addActionListener(new java.awt.event.ActionListener() {
    
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    
    btnGerarActionPerformed(evt);
    
    }
    
    });
    

    btnLimpar.setText(“Limpar Texto”);
    
    btnLimpar.addActionListener(new java.awt.event.ActionListener() {
    
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    
    btnLimparActionPerformed(evt);
    
    }
    
    });
    

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    
    jPanel1.setLayout(jPanel1Layout);
    
    jPanel1Layout.setHorizontalGroup(
    
    jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addGap(179, 179, 179)
    
    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 386, javax.swing.GroupLayout.PREFERRED_SIZE))
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addGap(244, 244, 244)
    
    .addComponent(btnGerar)
    
    .addGap(85, 85, 85)
    
    .addComponent(btnLimpar)))
    
    .addContainerGap(271, Short.MAX_VALUE))
    
    );
    
    jPanel1Layout.setVerticalGroup(
    
    jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addGap(39, 39, 39)
    
    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
    
    .addGap(41, 41, 41)
    
    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
    
    .addComponent(btnGerar)
    
    .addComponent(btnLimpar))
    
    .addContainerGap(167, Short.MAX_VALUE))
    
    );
    

    getContentPane().add(jPanel1);
    jPanel1.setBounds(120, 40, 840, 370);

    jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/imagem/azul abstrato.jpg"))); // NOI18N
    
    getContentPane().add(jLabel1);
    
    jLabel1.setBounds(0, 0, 1920, 1357);
    

    setSize(new java.awt.Dimension(1100, 572));
    
    setLocationRelativeTo(null);
    
    }//
    

  private void btnLimparActionPerformed(java.awt.event.ActionEvent evt) {
  
  textoParaQRCode.setText(null);
  
  }
  

  private void btnGerarActionPerformed(java.awt.event.ActionEvent evt) {
  
  //geraçao do QRCode
  
  int size = 125; //tamanho
  
  String nomeArquivo = “Mattheus.png”;//nome do arquivo de saida
  
  try (
  
  FileOutputStream f = new FileOutputStream(nomeArquivo);//fileout arquivo de saida
  
  ByteArrayOutputStream out = QRCode.from(textoParaQRCode.getText())
  
  .to(ImageType.PNG)
  
  .withSize(size,size)
  
  .stream();
  

  ){  
       f.write(out.toByteArray());//gravando o arquivo
          f.close();
          JOptionPane.showMessageDialog(rootPane, "ok", "Arquivo ",+nomeArquivo+" gerado com sucesso!",JOptionPane.INFORMATION_MESSAGE);
          
   } catch (IOException ex) {
       Logger.getLogger(QRCode.class.getName()).log(Level.SEVERE, null, ex);
   }
  

  }

  /**

  • @param args the command line arguments
    /
    public static void main(String args[]) {
    / Set the Nimbus look and feel /
    //
    / If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.

    • For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
      */
      try {
      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
      if (“Nimbus”.equals(info.getName())) {
      javax.swing.UIManager.setLookAndFeel(info.getClassName());
      break;
      }
      }
      } catch (ClassNotFoundException ex) {
      java.util.logging.Logger.getLogger(QRCode.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
      } catch (InstantiationException ex) {
      java.util.logging.Logger.getLogger(QRCode.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
      } catch (IllegalAccessException ex) {
      java.util.logging.Logger.getLogger(QRCode.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
      } catch (javax.swing.UnsupportedLookAndFeelException ex) {
      java.util.logging.Logger.getLogger(QRCode.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
      }
      //

    /* Create and display the form */
    
    java.awt.EventQueue.invokeLater(new Runnable() {
    
    public void run() {
    
    new QRCode().setVisible(true);
    

    }
    

    });
    }

  // Variables declaration - do not modify
  
  private javax.swing.JButton btnGerar;
  
  private javax.swing.JButton btnLimpar;
  
  private javax.swing.JLabel jLabel1;
  
  private javax.swing.JPanel jPanel1;
  
  private javax.swing.JScrollPane jScrollPane1;
  
  private javax.swing.JTextArea textoParaQRCode;
  
  // End of variables declaration
  
  }