diff --git a/src/main/java/com/example/cosmos_serversb/models/Groups.java b/src/main/java/com/example/cosmos_serversb/models/Groups.java
index 7be0ecd..924caed 100644
--- a/src/main/java/com/example/cosmos_serversb/models/Groups.java
+++ b/src/main/java/com/example/cosmos_serversb/models/Groups.java
@@ -19,33 +19,8 @@
     private static String baseURI = "http://nitta-lab-www.is.konan-u.ac.jp/";
     private static String AppName = "cosmos";
 
-    public static void setUp() {
-        // A SessionFactory is set up once for an application!
-        final StandardServiceRegistry registry = new StandardServiceRegistryBuilder()
-                .configure() // configures settings from hibernate.cfg.xml
-                .build();
-        try {
-            sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory();
-        }
-        catch (Exception e) {
-            // The registry would be destroyed by the SessionFactory, but we had trouble building the SessionFactory
-            // so destroy it manually.
-            StandardServiceRegistryBuilder.destroy( registry );
-        }
-    }
-
-    public static void tearDown() {
-        try {
-            if ( sessionFactory != null ) {
-                sessionFactory.close();
-            }
-        } catch (Exception e) {
-            System.out.println("Exception!");
-        }
-    }
-
     private Groups(){
-        setUp();
+        sessionFactory = SessionFactoryManager.getInstance().getSessionFactory();
     }
 
     public static Groups getInstance(){