Index: lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java
===================================================================
RCS file: /usr/local/cvsroot/lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java,v
diff -u -r1.99.4.3.2.1 -r1.99.4.3.2.2
--- lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java	25 May 2009 18:16:30 -0000	1.99.4.3.2.1
+++ lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java	10 Jun 2009 05:28:30 -0000	1.99.4.3.2.2
@@ -305,7 +305,8 @@
 	forumDao.deleteCondition(condition);
     }
 
-    public Message replyTopic(Long parentId, Long sessionId, Message replyMessage) throws PersistenceException {
+    public synchronized Message replyTopic(Long parentId, Long sessionId, Message replyMessage)
+	    throws PersistenceException {
 	// set parent
 	Message parent = this.getMessage(parentId);
 	replyMessage.setParent(parent);
Index: lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/web/actions/LearningAction.java
===================================================================
RCS file: /usr/local/cvsroot/lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/web/actions/LearningAction.java,v
diff -u -r1.65.6.1 -r1.65.6.2
--- lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/web/actions/LearningAction.java	25 May 2009 18:16:29 -0000	1.65.6.1
+++ lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/web/actions/LearningAction.java	10 Jun 2009 05:28:30 -0000	1.65.6.2
@@ -663,10 +663,7 @@
 	// save message into database
 	forumService = getForumManager();
 
-	// synchronized because of deadlock exceptions
-	synchronized (parentId) {
-	    forumService.replyTopic(parentId, sessionId, message);
-	}
+	forumService.replyTopic(parentId, sessionId, message);
 
 	// echo back this topic thread into page
 	Long rootTopicId = forumService.getRootTopicId(parentId);