--- a/gnv/src/main/java/de/intevation/gnv/action/sessionmodel/SessionModelFactory.java	Tue May 18 07:32:45 2010 +0000
+++ b/gnv/src/main/java/de/intevation/gnv/action/sessionmodel/SessionModelFactory.java	Tue May 18 09:11:31 2010 +0000
@@ -12,7 +12,13 @@
  */
 public class SessionModelFactory {
 
-    public final static String SESSION_MODEL_ID = "de.intevation.gnv.action.sessionmodel.SessionModel.ID";
+    /**
+     * The id of the <code>SessionModel</code> that must be used to lookup the 
+     * model from the given <code>HttpSession<Code> of the request.
+     */
+    public final static String SESSION_MODEL_ID = "de.intevation.gnv.action." +
+                                                 "sessionmodel.SessionModel.ID";
+
     /**
      * the logger, used to log exceptions and additonaly information
      */
@@ -32,10 +38,10 @@
 
     /**
      * This Method provides an singleton Instance of this Class.
-     *
      * @return an singleton Instance of this Class
      */
     public synchronized static SessionModelFactory getInstance() {
+        log.debug("SessionModelFactory.getInstance");
         if (instance == null) {
             instance = new SessionModelFactory();
         }
@@ -44,10 +50,11 @@
 
     /**
      * Getting the ArtifactDatabaseClient
-     *
+     * @param request the tequest from which the SessionModel should be read.
      * @return the ArtifactDatabaseClient
      */
     public SessionModel getSessionModel(HttpServletRequest request) {
+        log.debug("SessionModelFactory.getSessionModel");
         synchronized (request) {
             SessionModel sm = null;
             Object obj = request.getSession().getAttribute(SESSION_MODEL_ID);