diff --git a/bin/nova-api b/bin/nova-api
index 893eb201d..1bef778c5 100755
--- a/bin/nova-api
+++ b/bin/nova-api
@@ -43,13 +43,11 @@ FLAGS = flags.FLAGS
 
 
 def main(_argv):
-    user_manager = users.UserManager()
-    host_manager = model.Host
     controllers = {
         'Cloud': cloud.CloudController(),
-        'Admin': admin.AdminController(user_manager, host_manager)
+        'Admin': admin.AdminController()
     }
-    _app = api.APIServerApplication(user_manager, controllers)
+    _app = api.APIServerApplication(controllers)
 
     conn = rpc.Connection.instance()
     consumer = rpc.AdapterConsumer(connection=conn,
diff --git a/nova/endpoint/admin.py b/nova/endpoint/admin.py
index 4471a4ef4..ceab7d1f9 100644
--- a/nova/endpoint/admin.py
+++ b/nova/endpoint/admin.py
@@ -24,6 +24,9 @@ Admin API controller, exposed through http via the api worker.
 
 import base64
 
+from nova.auth import users
+from nova.compute import model
+
 def user_dict(user, base64_file=None):
     """Convert the user object to a result dict"""
     if user:
@@ -62,28 +65,24 @@ class AdminController(object):
     allowing project managers to administer project users.
     """
 
-    def __init__(self, user_manager, host_manager):
-        self.user_manager = user_manager
-        self.host_manager = host_manager
-
     def __str__(self):
         return 'AdminController'
 
     @admin_only
     def describe_user(self, _context, name, **_kwargs):
         """Returns user data, including access and secret keys."""
-        return user_dict(self.user_manager.get_user(name))
+        return user_dict(users.UserManager.instance().get_user(name))
 
     @admin_only
     def describe_users(self, _context, **_kwargs):
         """Returns all users - should be changed to deal with a list."""
         return {'userSet':
-            [user_dict(u) for u in self.user_manager.get_users()] }
+            [user_dict(u) for u in users.UserManager.instance().get_users()] }
 
     @admin_only
     def register_user(self, _context, name, **_kwargs):
         """Creates a new user, and returns generated credentials."""
-        return user_dict(self.user_manager.create_user(name))
+        return user_dict(users.UserManager.instance().create_user(name))
 
     @admin_only
     def deregister_user(self, _context, name, **_kwargs):
@@ -91,7 +90,7 @@ class AdminController(object):
            Should throw an exception if the user has instances,
            volumes, or buckets remaining.
         """
-        self.user_manager.delete_user(name)
+        users.UserManager.instance().delete_user(name)
 
         return True
 
@@ -103,8 +102,8 @@ class AdminController(object):
         """
         if project is None:
             project = name
-        project = self.user_manager.get_project(project)
-        user = self.user_manager.get_user(name)
+        project = users.UserManager.instance().get_project(project)
+        user = users.UserManager.instance().get_user(name)
         return user_dict(user, base64.b64encode(project.get_credentials(user)))
 
     @admin_only
@@ -117,9 +116,9 @@ class AdminController(object):
             * DHCP servers running
             * Iptables / bridges
         """
-        return {'hostSet': [host_dict(h) for h in self.host_manager.all()]}
+        return {'hostSet': [host_dict(h) for h in model.Host.all()]}
 
     @admin_only
     def describe_host(self, _context, name, **_kwargs):
         """Returns status info for single node."""
-        return host_dict(self.host_manager.lookup(name))
+        return host_dict(model.Host.lookup(name))
diff --git a/nova/endpoint/api.py b/nova/endpoint/api.py
index ece487b7b..86a4551ad 100755
--- a/nova/endpoint/api.py
+++ b/nova/endpoint/api.py
@@ -324,7 +324,7 @@ class APIRequestHandler(tornado.web.RequestHandler):
 
 
 class APIServerApplication(tornado.web.Application):
-    def __init__(self, user_manager, controllers):
+    def __init__(self, controllers):
         tornado.web.Application.__init__(self, [
             (r'/', RootRequestHandler),
             (r'/cloudpipe/(.*)', nova.cloudpipe.api.CloudPipeRequestHandler),
@@ -341,5 +341,4 @@ class APIServerApplication(tornado.web.Application):
             (r'/2007-01-19/([-A-Za-z0-9/]*)', MetadataRequestHandler),
             (r'/1.0/([-A-Za-z0-9/]*)', MetadataRequestHandler),
         ], pool=multiprocessing.Pool(4))
-        self.user_manager = user_manager
         self.controllers = controllers
diff --git a/nova/tests/api_unittest.py b/nova/tests/api_unittest.py
index a796ab41e..d82089e6f 100644
--- a/nova/tests/api_unittest.py
+++ b/nova/tests/api_unittest.py
@@ -159,7 +159,7 @@ class ApiEc2TestCase(test.BaseTestCase):
 
         self.host = '127.0.0.1'
 
-        self.app = api.APIServerApplication(self.users, {'Cloud': self.cloud})
+        self.app = api.APIServerApplication({'Cloud': self.cloud})
         self.ec2 = boto.connect_ec2(
                 aws_access_key_id='fake',
                 aws_secret_access_key='fake',
diff --git a/nova/tests/validator_unittest.py b/nova/tests/validator_unittest.py
index 6ebce0994..eea1beccb 100644
--- a/nova/tests/validator_unittest.py
+++ b/nova/tests/validator_unittest.py
@@ -42,5 +42,4 @@ class ValidationTestCase(test.TrialTestCase):
         
 @validate.typetest(instanceid=str, size=int, number_of_instances=int)
 def type_case(instanceid, size, number_of_instances):
-    print ("type_case was successfully executed")
-    return True
\ No newline at end of file
+    return True