Correctly set subject of chat rooms

The REST API plugin should not use `MUCRoom.setSubject()` to set the room's subject. Instead, it should use `MUCRoom.changeSubject()`

A related issue has been documented in Openfire's JIRA issue as https://igniterealtime.atlassian.net/browse/OF-3131

fixes #213

Author: guusdk

changelog.html

@@ -44,6 +44,11 @@ <h1>
 REST API Plugin Changelog
 </h1>
 
+<p><b>1.12.1</b> (to be determined)</p>
+<ul>
+    <li>[<a href="https://github.com/igniterealtime/openfire-restAPI-plugin/issues/213">#213</a>] - Improve setting a subject in a chat room</li>
+</ul>
+
 <p><b>1.12.0</b> July 4, 2025</p>
 <ul>
     <li>Now requires Openfire 5.0.0 or later</li>

plugin.xml

@@ -6,7 +6,7 @@
     <description>Allows administration over a RESTful API.</description>
     <author>Roman Soldatow</author>
     <version>${project.version}</version>
-    <date>2025-07-04</date>
+    <date>2025-10-02</date>
     <minServerVersion>5.0.0</minServerVersion>
     <adminconsole>
         <tab id="tab-server">

src/java/org/jivesoftware/openfire/plugin/rest/controller/MUCRoomController.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022-2023 Ignite Realtime Foundation
+ * Copyright (c) 2022-2025 Ignite Realtime Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -438,7 +438,6 @@ private void createRoom(MUCRoomEntity mucRoomEntity, String serviceName, boolean
 
             // Set values
             room.setNaturalLanguageName(mucRoomEntity.getNaturalName());
-            room.setSubject(mucRoomEntity.getSubject());
             room.setDescription(mucRoomEntity.getDescription());
             room.setPassword(mucRoomEntity.getPassword());
             room.setPersistent(mucRoomEntity.isPersistent());
@@ -494,6 +493,15 @@ private void createRoom(MUCRoomEntity mucRoomEntity, String serviceName, boolean
                 room.saveToDB();
             }
 
+            // Set the subject (see issue #213 and OF-3131).
+            final Message message = new Message();
+            message.setType(Message.Type.groupchat);
+            message.setSubject(mucRoomEntity.getSubject());
+            message.setFrom(room.getSelfRepresentation().getOccupantJID());
+            message.setTo(room.getSelfRepresentation().getOccupantJID());
+            log("Setting subject of room that is being created/updated: " + mucRoomEntity.getRoomName());
+            room.changeSubject(message, room.getSelfRepresentation());
+
             log("Syncing room that is being created/updated: " + mucRoomEntity.getRoomName());
             service.syncChatRoom(room);