saving file using hibernate

package com.boraji.tutorial.hibernate;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.engine.jdbc.BlobProxy;

import com.boraji.tutorial.hibernate.entity.Product;

/**
 * @author imssbora
 */
public class ImageSaveExample {
   public static void main(String[] args) {
      Session session = null;
      Transaction transaction = null;
      try {
         session = HibernateUtil.getSessionFactory().openSession();
         transaction = session.beginTransaction();
         transaction.begin();
         
         Product product=new Product();
         product.setName("Java - The Complete Reference");
         session.doWork(conn->{
            product.setImage(BlobProxy.generateProxy(getImage()));
         });
         session.save(product);
         transaction.commit();
         
         System.out.println("Product is saved successfully.");
         
      } catch (Exception e) {
         if (transaction != null) {
            System.out.println("Transaction is being rolled back.");
            transaction.rollback();
         }
         e.printStackTrace();
      } finally {
         if (session != null) {
            session.close();
         }
      }

      HibernateUtil.shutdown();
   }

   public static byte[] getImage() {
      File file =new File("Java.png");
      if(file.exists()){
         try {
            BufferedImage bufferedImage=ImageIO.read(file);
            ByteArrayOutputStream byteOutStream=new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, "png", byteOutStream);
            return byteOutStream.toByteArray();
         } catch (IOException e) {
            e.printStackTrace();
         }
      }
      return null;
   }
}

package com.boraji.tutorial.hibernate;

import java.util.HashMap;
import java.util.Map;

import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import com.boraji.tutorial.hibernate.entity.Product;

/**
 * @author imssbora
 */
public class HibernateUtil {
  private static StandardServiceRegistry registry;
  private static SessionFactory sessionFactory;

  public static SessionFactory getSessionFactory() {
    if (sessionFactory == null) {
      try {
        StandardServiceRegistryBuilder registryBuilder = 
            new StandardServiceRegistryBuilder();

        Map<String, String> settings = new HashMap<>();
        settings.put("hibernate.connection.driver_class", "com.mysql.cj.jdbc.Driver");
        settings.put("hibernate.connection.url", "jdbc:mysql://localhost:3306/BORAJI");
        settings.put("hibernate.connection.username", "root");
        settings.put("hibernate.connection.password", "admin");
        settings.put("hibernate.show_sql", "true");
        settings.put("hibernate.hbm2ddl.auto", "update");

        registryBuilder.applySettings(settings);

        registry = registryBuilder.build();

        MetadataSources sources = new MetadataSources(registry)
            .addAnnotatedClass(Product.class);

        Metadata metadata = sources.getMetadataBuilder().build();

        sessionFactory = metadata.getSessionFactoryBuilder().build();
      } catch (Exception e) {
        System.out.println("SessionFactory creation failed");
        if (registry != null) {
          StandardServiceRegistryBuilder.destroy(registry);
        }
      }
    }
    return sessionFactory;
  }

  public static void shutdown() {
    if (registry != null) {
      StandardServiceRegistryBuilder.destroy(registry);
    }
  }
}

package com.boraji.tutorial.hibernate;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.boraji.tutorial.hibernate.entity.Product;

/**
 * @author imssbora
 */
public class ImageLoadExample {
   public static void main(String[] args) {
      Session session = null;
      Transaction transaction = null;
      try {
         session = HibernateUtil.getSessionFactory().openSession();
         transaction = session.getTransaction();
         transaction.begin();

         Product product = session.get(Product.class, 4L);
         System.out.println("Product Name: "+product.getName());
         
         InputStream imgStream = product.getImage().getBinaryStream();
         saveImage(imgStream);

         transaction.commit();
      } catch (Exception e) {
         if (transaction != null) {
            transaction.rollback();
         }
         e.printStackTrace();
      } finally {
         if (session != null) {
            session.close();
         }
      }

      HibernateUtil.shutdown();
   }

   public static void saveImage(InputStream stream) {
      File file = new File("output.png");
      try(FileOutputStream outputStream = new FileOutputStream(file)) {
         BufferedImage bufferedImage = ImageIO.read(stream);
         ImageIO.write(bufferedImage, "png", outputStream);
         System.out.println("Image file location: "+file.getCanonicalPath());
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}