Добавлен Hybernate и реализован прототип БД

src/main/java/com/rosetta/im/database/HibernateUtil.java

@@ -0,0 +1,33 @@
+package com.rosetta.im.database;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.cfg.Configuration;
+
+public class HibernateUtil {
+    private static final SessionFactory sessionFactory;
+
+    static {
+        try {
+            sessionFactory = new Configuration().configure().buildSessionFactory();
+        } catch (Exception e) {
+            throw new ExceptionInInitializerError("Error initializing Hibernate: " + e.getMessage());
+        }
+    }
+
+    public static SessionFactory getSessionFactory() {
+        return sessionFactory;
+    }
+
+    public static Session getCurrentSession() {
+        return sessionFactory.getCurrentSession();
+    }
+
+    public static Session openSession() {
+        return sessionFactory.openSession();
+    }
+
+    public static void shutdown() {
+        sessionFactory.close();
+    }
+}