--- a/dwtx/jface/text/DocumentRewriteSessionEvent.d	Wed Aug 27 14:49:30 2008 +0200
+++ b/dwtx/jface/text/DocumentRewriteSessionEvent.d	Mon Sep 08 00:51:37 2008 +0200
@@ -61,7 +61,6 @@
 import dwtx.jface.text.IDocumentExtension4; // packageimport
 import dwtx.jface.text.IDocumentExtension2; // packageimport
 import dwtx.jface.text.IDocumentPartitionerExtension2; // packageimport
-import dwtx.jface.text.Assert; // packageimport
 import dwtx.jface.text.DefaultInformationControl; // packageimport
 import dwtx.jface.text.IWidgetTokenOwnerExtension; // packageimport
 import dwtx.jface.text.DocumentClone; // packageimport
@@ -169,8 +168,28 @@
  */
 public class DocumentRewriteSessionEvent {
 
-    public const static Object SESSION_START= new Object();
-    public const static Object SESSION_STOP= new Object();
+    private static Object SESSION_START_;
+    public static Object SESSION_START(){
+        if( SESSION_START_ is null ){
+            synchronized(DocumentRewriteSessionEvent.classinfo){
+                if( SESSION_START_ is null ){
+                    SESSION_START_ = new Object();
+                }
+            }
+        }
+        return SESSION_START_;
+    }
+    private static Object SESSION_STOP_;
+    public static Object SESSION_STOP(){
+        if( SESSION_STOP_ is null ){
+            synchronized(DocumentRewriteSessionEvent.classinfo){
+                if( SESSION_STOP_ is null ){
+                    SESSION_STOP_ = new Object();
+                }
+            }
+        }
+        return SESSION_STOP_;
+    }
 
     /** The changed document */
     public IDocument fDocument;
@@ -189,7 +208,7 @@
      *            {@link DocumentRewriteSessionEvent#SESSION_STOP}.
      */
     public this(IDocument doc, DocumentRewriteSession session, Object changeType) {
-        Assert.isNotNull(doc);
+        Assert.isNotNull(cast(Object)doc);
         Assert.isNotNull(session);
 
         fDocument= doc;