--- a/web/_exceptions.py	Fri Apr 23 14:55:10 2010 +0200
+++ b/web/_exceptions.py	Fri Apr 23 12:19:54 2010 +0200
@@ -57,8 +57,5 @@
         self.reason = reason
 
     def dumps(self):
-        try:
-            from json import dumps
-        except ImportError:
-            from simplejson import dumps
-        return dumps({'reason': self.reason})
+        from cubicweb.web import json
+        return json.dumps({'reason': self.reason})