group and channel name can't be null

src/main/java/org/to/telegramfinalproject/Client/ActionHandler.java

@@ -261,8 +261,16 @@ public class ActionHandler {
     public void createGroup() {
         System.out.print("Enter group ID: ");
         String groupId = scanner.nextLine();
-        System.out.print("Enter group name: ");
+        String groupName = null;
-        String groupName = scanner.nextLine();
+        while (groupName == null) {
+            System.out.print("Enter group name: ");
+            String input = scanner.nextLine();
+            if (!input.trim().isEmpty()) {
+                groupName = input;
+            } else {
+                System.out.println("Group name can't be empty.");
+            }
+        }
         System.out.print("Enter image URL (optional): ");
         String imageUrl = scanner.nextLine();
 
@@ -281,8 +289,16 @@ public class ActionHandler {
     public void createChannel() {
         System.out.print("Enter channel ID: ");
         String channelId = scanner.nextLine();
-        System.out.print("Enter channel name: ");
+        String channelName = null;
-        String channelName = scanner.nextLine();
+        while (channelName == null) {
+            System.out.print("Enter channel name: ");
+            String input = scanner.nextLine();
+            if (!input.trim().isEmpty()) {
+                channelName = input;
+            } else {
+                System.out.println("Channel name can't be empty.");
+            }
+        }
         System.out.print("Enter image URL (optional): ");
         String imageUrl = scanner.nextLine();
 

src/main/java/org/to/telegramfinalproject/Database/ChannelDatabase.java

@@ -576,7 +576,7 @@ public class ChannelDatabase {
 
 
     public static boolean transferOwnership(UUID channelId, UUID newOwnerUUID) {
-        String sql = """
+        String updateRoles = """
         UPDATE channel_subscribers
         SET role = CASE
             WHEN user_id = ? THEN 'owner'
@@ -586,21 +586,41 @@ public class ChannelDatabase {
         WHERE channel_id = ?
     """;
 
-        try (Connection conn = ConnectionDb.connect();
+        String clearPermissions = """
-             PreparedStatement stmt = conn.prepareStatement(sql)) {
+        UPDATE channel_subscribers
+        SET permissions = '{}'::jsonb
+        WHERE channel_id = ? AND user_id = ?
+    """;
 
-            stmt.setObject(1, newOwnerUUID);
+        try (Connection conn = ConnectionDb.connect()) {
-            stmt.setObject(2, channelId);
+            conn.setAutoCommit(false);
 
-            stmt.executeUpdate();
+            try (PreparedStatement roleStmt = conn.prepareStatement(updateRoles);
-            return true;
+                 PreparedStatement clearPermsStmt = conn.prepareStatement(clearPermissions)) {
 
+                roleStmt.setObject(1, newOwnerUUID);
+                roleStmt.setObject(2, channelId);
+                roleStmt.executeUpdate();
+
+                clearPermsStmt.setObject(1, channelId);
+                clearPermsStmt.setObject(2, newOwnerUUID);
+                clearPermsStmt.executeUpdate();
+
+                conn.commit();
+                return true;
+
+            } catch (SQLException e) {
+                conn.rollback();
+                e.printStackTrace();
+            }
         } catch (SQLException e) {
             e.printStackTrace();
-            return false;
         }
+
+        return false;
     }
 
+
     public static List<UUID> getChannelSubscriberUUIDs(UUID channelId) {
         List<UUID> subscriberIds = new ArrayList<>();
         try (Connection conn = ConnectionDb.connect();

src/main/java/org/to/telegramfinalproject/Database/ConnectionDb.java

@@ -7,7 +7,7 @@ import java.sql.SQLException;
 public class ConnectionDb {
     private static final String JDBC_URL = "jdbc:postgresql://localhost:5432/Telegram";
     private static final String USERNAME = "postgres";
-    private static final String PASSWORD = "124postpass";
+    private static final String PASSWORD = "Partow@1384";
 
     public ConnectionDb() {
     }

src/main/java/org/to/telegramfinalproject/Database/GroupDatabase.java

@@ -559,7 +559,7 @@ public class GroupDatabase {
 
     public static boolean transferOwnership(UUID groupId, UUID newOwnerId) {
         String demoteOldOwner = "UPDATE group_members SET role = 'admin' WHERE group_id = ? AND role = 'owner'";
-        String promoteNewOwner = "UPDATE group_members SET role = 'owner' WHERE group_id = ? AND user_id = ?";
+        String promoteNewOwner = "UPDATE group_members SET role = 'owner', permissions = '{}'::jsonb WHERE group_id = ? AND user_id = ?";
 
         try (Connection conn = ConnectionDb.connect()) {
             conn.setAutoCommit(false);