Index: lams_tool_nb/src/java/org/lamsfoundation/lams/tool/noticeboard/NoticeboardSession.java
===================================================================
diff -u -r419dafeead9b321b9de16300ce0bbee97c32a189 -r0539495b645c71f741d28f269584fcfb933cfe0c
--- lams_tool_nb/src/java/org/lamsfoundation/lams/tool/noticeboard/NoticeboardSession.java	(.../NoticeboardSession.java)	(revision 419dafeead9b321b9de16300ce0bbee97c32a189)
+++ lams_tool_nb/src/java/org/lamsfoundation/lams/tool/noticeboard/NoticeboardSession.java	(.../NoticeboardSession.java)	(revision 0539495b645c71f741d28f269584fcfb933cfe0c)
@@ -59,7 +59,7 @@
 	private NoticeboardContent nbContent;
 	
 	/** persistent field */
-	private Set nbUsers;
+	private Set nbUsers = new HashSet();
 	
 	/** default constructor */
 	public NoticeboardSession()
@@ -99,6 +99,22 @@
 	    this.sessionStatus = sessionStatus;
 	}
 	
+	public NoticeboardSession(Long nbSessionId,
+	        					NoticeboardContent nbContent)
+	{
+	    this.nbSessionId = nbSessionId;
+	    this.nbContent = nbContent;
+	    this.sessionStartDate = new Date(System.currentTimeMillis());
+		this.sessionStatus = NoticeboardSession.INCOMPLETE;
+	}
+	
+	public NoticeboardSession(Long nbSessionId)
+	{
+	    this.nbSessionId = nbSessionId;
+	    this.sessionStartDate = new Date(System.currentTimeMillis());
+		this.sessionStatus = NoticeboardSession.INCOMPLETE;
+	}
+	
 	/**
 	 * 		@hibernate.many-to-one
      *      not-null="true"
@@ -205,4 +221,6 @@
     public void setNbUsers(Set nbUsers) {
         this.nbUsers = nbUsers;
     }
+    
+   
 }