BAEL-1280: Mapping Dynamic Values (@Formula, @Filter, @Any, @Where)

hibernate5/src/main/java/com/baeldung/hibernate/HibernateUtil.java

@@ -1,24 +1,58 @@
 package com.baeldung.hibernate;
 
+import com.baeldung.hibernate.pojo.Employee;
+import com.baeldung.hibernate.pojo.EntityDescription;
+import com.baeldung.hibernate.pojo.Phone;
 import org.hibernate.SessionFactory;
-import org.hibernate.cfg.Configuration;
+import org.hibernate.boot.Metadata;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.service.ServiceRegistry;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Properties;
 
 public class HibernateUtil {
+    private static SessionFactory sessionFactory;
 
-    private static final SessionFactory sessionFactory;
-
-    static {
-        try {
-            Configuration configuration = new Configuration().configure();
-            sessionFactory = configuration.buildSessionFactory();
-
-        } catch (Throwable ex) {
-            System.err.println("Initial SessionFactory creation failed." + ex);
-            throw new ExceptionInInitializerError(ex);
+    public static SessionFactory getSessionFactory() throws IOException {
+        if (sessionFactory == null) {
+            ServiceRegistry serviceRegistry = configureServiceRegistry();
+            sessionFactory = makeSessionFactory(serviceRegistry);
         }
-    }
-
-    public static SessionFactory getSessionFactory() {
         return sessionFactory;
     }
+
+    private static SessionFactory makeSessionFactory(ServiceRegistry serviceRegistry) {
+        MetadataSources metadataSources = new MetadataSources(serviceRegistry);
+        metadataSources.addPackage("com.baeldung.hibernate.pojo");
+        metadataSources.addAnnotatedClass(Employee.class);
+        metadataSources.addAnnotatedClass(Phone.class);
+        metadataSources.addAnnotatedClass(EntityDescription.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("hibernate.properties");
+        try (FileInputStream inputStream = new FileInputStream(propertiesURL.getFile())) {
+            properties.load(inputStream);
+        }
+        return properties;
+    }
+
 }