Add code for article "Mapping LOB Data in Hibernate" (#3778)

* Add lob example

* Migrate the XML Based Configuration to Java Based Configuration

hibernate5/src/main/java/com/baeldung/hibernate/lob/HibernateSessionUtil.java

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+package com.baeldung.hibernate.lob;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Properties;
+
+import org.apache.commons.lang3.StringUtils;
+import org.hibernate.SessionFactory;
+import org.hibernate.boot.Metadata;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.service.ServiceRegistry;
+
+import com.baeldung.hibernate.lob.model.User;
+
+public class HibernateSessionUtil {
+
+	private static SessionFactory sessionFactory;
+    private static String PROPERTY_FILE_NAME;
+
+    public static SessionFactory getSessionFactory() throws IOException {
+        return getSessionFactory(null);
+    }
+
+    public static SessionFactory getSessionFactory(String propertyFileName) throws IOException {
+        PROPERTY_FILE_NAME = propertyFileName;
+        if (sessionFactory == null) {
+            ServiceRegistry serviceRegistry = configureServiceRegistry();
+            sessionFactory = makeSessionFactory(serviceRegistry);
+        }
+        return sessionFactory;
+    }
+
+    private static SessionFactory makeSessionFactory(ServiceRegistry serviceRegistry) {
+        MetadataSources metadataSources = new MetadataSources(serviceRegistry);
+        metadataSources.addAnnotatedClass(User.class);
+
+        Metadata metadata = metadataSources.buildMetadata();
+        return metadata.getSessionFactoryBuilder()
+                .build();
+
+    }
+
+    private static ServiceRegistry configureServiceRegistry() throws IOException {
+        Properties properties = getProperties();
+        return new StandardServiceRegistryBuilder().applySettings(properties)
+                .build();
+    }
+
+    private static Properties getProperties() throws IOException {
+        Properties properties = new Properties();
+        URL propertiesURL = Thread.currentThread()
+          .getContextClassLoader()
+          .getResource(StringUtils.defaultString(PROPERTY_FILE_NAME, "hibernate.properties"));
+        try (FileInputStream inputStream = new FileInputStream(propertiesURL.getFile())) {
+            properties.load(inputStream);
+        }
+        return properties;
+    }
+}

hibernate5/src/main/java/com/baeldung/hibernate/lob/model/User.java

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+package com.baeldung.hibernate.lob.model;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Lob;
+import javax.persistence.Table;
+
+@Entity 
+@Table(name="user")
+public class User {
+
+    @Id
+	private String id; 
+	 
+	@Column(name = "name", columnDefinition="VARCHAR(128)") 
+	private String name; 
+	 
+	@Lob 
+	@Column(name = "photo", columnDefinition="BLOB") 
+	private byte[] photo;
+	 
+	public String getId() {
+		return id;
+	}
+	 
+	public void setId(String id) {
+		this.id = id;
+	}
+	
+	public String getName() {
+		return name;
+	}
+	
+	public void setName(String name) {
+		this.name = name;
+	}
+	
+	public byte[] getPhoto() {
+		return photo;
+	}
+	
+	public void setPhoto(byte[] photo) {
+		this.photo = photo;
+	}
+}

hibernate5/src/test/java/com/baeldung/hibernate/lob/LobTest.java

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+package com.baeldung.hibernate.lob;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+
+import org.apache.commons.io.IOUtils;
+import org.hibernate.HibernateException;
+import org.hibernate.Session;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.baeldung.hibernate.lob.model.User;
+
+public class LobTest {
+
+	private Session session;
+	
+	@Before
+	public void init(){
+		try {
+			session = HibernateSessionUtil.getSessionFactory("hibernate.properties")
+			          .openSession();
+		} catch (HibernateException | IOException e) {
+			fail("Failed to initiate Hibernate Session [Exception:" + e.toString() + "]");
+		}
+	}
+	
+	@After
+	public void close(){
+        if(session != null) session.close();
+	}
+	
+	@Test
+	public void givenValidInsertLobObject_whenQueried_returnSameDataAsInserted(){
+		User user = new User(); 
+		try(InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("profile.png");) { 
+			// Get Image file from the resource 
+			if(inputStream == null) fail("Unable to get resources"); 
+			user.setId("1"); 
+			user.setName("User"); 
+			user.setPhoto(IOUtils.toByteArray(inputStream)); 
+			
+			session.persist(user);
+		} catch (IOException e) { 
+			fail("Unable to read input stream"); 
+		}
+		
+		User result = session.find(User.class, "1");
+		
+		assertNotNull("Query result is null", result); 
+		assertEquals("User's name is invalid", user.getName(), result.getName() ); 
+		assertTrue("User's photo is corrupted", Arrays.equals(user.getPhoto(), result.getPhoto()) );
+	}
+}