diff --git a/scm-test/src/main/java/sonia/scm/ManagerTestBase.java b/scm-test/src/main/java/sonia/scm/ManagerTestBase.java
index 5499bc4526..ccf34a0629 100644
--- a/scm-test/src/main/java/sonia/scm/ManagerTestBase.java
+++ b/scm-test/src/main/java/sonia/scm/ManagerTestBase.java
@@ -40,7 +40,7 @@ package sonia.scm;
  * @param <T>
  * @param <E>
  */
-public abstract class ManagerTestBase<T extends TypedObject,
+public abstract class ManagerTestBase<T extends ModelObject,
         E extends Exception> extends AbstractTestBase
 {
 
diff --git a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/AbstractResource.java b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/AbstractManagerResource.java
similarity index 69%
rename from scm-webapp/src/main/java/sonia/scm/api/rest/resources/AbstractResource.java
rename to scm-webapp/src/main/java/sonia/scm/api/rest/resources/AbstractManagerResource.java
index 4375198c30..3fc9e82a04 100644
--- a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/AbstractResource.java
+++ b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/AbstractManagerResource.java
@@ -33,9 +33,18 @@
 
 package sonia.scm.api.rest.resources;
 
+//~--- non-JDK imports --------------------------------------------------------
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import sonia.scm.Manager;
+import sonia.scm.ModelObject;
+
 //~--- JDK imports ------------------------------------------------------------
 
 import java.util.Collection;
+
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
@@ -55,51 +64,31 @@ import javax.ws.rs.core.UriInfo;
  * @author Sebastian Sdorra
  *
  * @param <T>
+ * @param <E>
  */
-public abstract class AbstractResource<T>
+public abstract class AbstractManagerResource<T extends ModelObject,
+        E extends Exception>
 {
 
-  /**
-   * Method description
-   *
-   *
-   * @param item
-   *
-   * @throws Exception
-   */
-  protected abstract void addItem(T item) throws Exception;
+  /** the logger for AbstractManagerResource */
+  private static final Logger logger =
+    LoggerFactory.getLogger(AbstractManagerResource.class);
+
+  //~--- constructors ---------------------------------------------------------
 
   /**
-   * Method description
+   * Constructs ...
    *
    *
-   * @param item
-   *
-   * @throws Exception
+   * @param manager
    */
-  protected abstract void removeItem(T item) throws Exception;
-
-  /**
-   * Method description
-   *
-   *
-   * @param name
-   * @param item
-   *
-   * @throws Exception
-   */
-  protected abstract void updateItem(String name, T item) throws Exception;
+  public AbstractManagerResource(Manager<T, E> manager)
+  {
+    this.manager = manager;
+  }
 
   //~--- get methods ----------------------------------------------------------
 
-  /**
-   * Method description
-   *
-   *
-   * @return
-   */
-  protected abstract Collection<T> getAllItems();
-
   /**
    * Method description
    *
@@ -110,16 +99,6 @@ public abstract class AbstractResource<T>
    */
   protected abstract String getId(T item);
 
-  /**
-   * Method description
-   *
-   *
-   * @param name
-   *
-   * @return
-   */
-  protected abstract T getItem(String name);
-
   /**
    * Method description
    *
@@ -142,14 +121,18 @@ public abstract class AbstractResource<T>
    */
   @POST
   @Consumes({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
-  public Response add(@Context UriInfo uriInfo, T item)
+  public Response create(@Context UriInfo uriInfo, T item)
   {
+    preCreate(item);
+
     try
     {
-      addItem(item);
+      manager.create(item);
     }
     catch (Exception ex)
     {
+      logger.error("error during create", ex);
+
       throw new WebApplicationException(ex);
     }
 
@@ -167,22 +150,26 @@ public abstract class AbstractResource<T>
    *   @return
    */
   @DELETE
-  @Path("{name}")
-  public Response delete(@PathParam("name") String name)
+  @Path("{id}")
+  public Response delete(@PathParam("id") String name)
   {
-    T item = getItem(name);
+    T item = manager.get(name);
 
     if (item == null)
     {
       throw new WebApplicationException(Response.Status.NOT_FOUND);
     }
 
+    preDelete(item);
+
     try
     {
-      removeItem(item);
+      manager.delete(item);
     }
     catch (Exception ex)
     {
+      logger.error("error during create", ex);
+
       throw new WebApplicationException(ex);
     }
 
@@ -190,25 +177,27 @@ public abstract class AbstractResource<T>
   }
 
   /**
-   * Method description
+   *  Method description
    *
    *
    *
    *
-   * @param uriInfo
-   * @param name
-   * @param item
+   *  @param uriInfo
+   *  @param name
+   *  @param item
    *
    */
   @PUT
-  @Path("{name}")
+  @Path("{id}")
   @Consumes({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
-  public void update(@Context UriInfo uriInfo, @PathParam("name") String name,
+  public void update(@Context UriInfo uriInfo, @PathParam("id") String name,
                      T item)
   {
+    preUpate(item);
+
     try
     {
-      updateItem(name, item);
+      manager.modify(item);
     }
     catch (Exception ex)
     {
@@ -219,26 +208,26 @@ public abstract class AbstractResource<T>
   //~--- get methods ----------------------------------------------------------
 
   /**
-   * Method description
+   *  Method description
    *
    *
-   * @param name
+   *  @param id
    *
-   * @return
+   *  @return
    */
   @GET
-  @Path("{name}")
+  @Path("{id}")
   @Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
-  public T get(@PathParam("name") String name)
+  public T get(@PathParam("id") String id)
   {
-    T item = getItem(name);
+    T item = manager.get(id);
 
     if (item == null)
     {
       throw new WebApplicationException(Response.Status.NOT_FOUND);
     }
 
-    return item;
+    return prepareForReturn(item);
   }
 
   /**
@@ -251,6 +240,63 @@ public abstract class AbstractResource<T>
   @Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
   public Collection<T> getAll()
   {
-    return getAllItems();
+    return prepareForReturn(manager.getAll());
   }
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param item
+   */
+  protected void preCreate(T item) {}
+
+  /**
+   * Method description
+   *
+   *
+   * @param item
+   */
+  protected void preDelete(T item) {}
+
+  /**
+   * Method description
+   *
+   *
+   * @param item
+   */
+  protected void preUpate(T item) {}
+
+  /**
+   * Method description
+   *
+   *
+   * @param item
+   *
+   * @return
+   */
+  protected T prepareForReturn(T item)
+  {
+    return item;
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param items
+   *
+   * @return
+   */
+  protected Collection<T> prepareForReturn(Collection<T> items)
+  {
+    return items;
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  protected Manager<T, E> manager;
 }
diff --git a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/GroupResource.java b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/GroupResource.java
index 38c21a4ca6..558d456bc3 100644
--- a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/GroupResource.java
+++ b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/GroupResource.java
@@ -39,12 +39,11 @@ import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
 import sonia.scm.group.Group;
+import sonia.scm.group.GroupException;
 import sonia.scm.group.GroupManager;
 
 //~--- JDK imports ------------------------------------------------------------
 
-import java.util.Collection;
-
 import javax.ws.rs.Path;
 
 /**
@@ -53,7 +52,8 @@ import javax.ws.rs.Path;
  */
 @Path("groups")
 @Singleton
-public class GroupResource extends AbstractResource<Group>
+public class GroupResource
+        extends AbstractManagerResource<Group, GroupException>
 {
 
   /** Field description */
@@ -70,68 +70,11 @@ public class GroupResource extends AbstractResource<Group>
   @Inject
   public GroupResource(GroupManager groupManager)
   {
-    this.groupManager = groupManager;
-  }
-
-  //~--- methods --------------------------------------------------------------
-
-  /**
-   * Method description
-   *
-   *
-   * @param group
-   *
-   * @throws Exception
-   */
-  @Override
-  protected void addItem(Group group) throws Exception
-  {
-    groupManager.create(group);
-  }
-
-  /**
-   * Method description
-   *
-   *
-   * @param group
-   *
-   * @throws Exception
-   */
-  @Override
-  protected void removeItem(Group group) throws Exception
-  {
-    groupManager.delete(group);
-  }
-
-  /**
-   * Method description
-   *
-   *
-   * @param name
-   * @param group
-   *
-   * @throws Exception
-   */
-  @Override
-  protected void updateItem(String name, Group group) throws Exception
-  {
-    groupManager.modify(group);
+    super(groupManager);
   }
 
   //~--- get methods ----------------------------------------------------------
 
-  /**
-   * Method description
-   *
-   *
-   * @return
-   */
-  @Override
-  protected Collection<Group> getAllItems()
-  {
-    return groupManager.getAll();
-  }
-
   /**
    * Method description
    *
@@ -146,20 +89,6 @@ public class GroupResource extends AbstractResource<Group>
     return group.getName();
   }
 
-  /**
-   * Method description
-   *
-   *
-   * @param name
-   *
-   * @return
-   */
-  @Override
-  protected Group getItem(String name)
-  {
-    return groupManager.get(name);
-  }
-
   /**
    * Method description
    *
@@ -171,9 +100,4 @@ public class GroupResource extends AbstractResource<Group>
   {
     return PATH_PART;
   }
-
-  //~--- fields ---------------------------------------------------------------
-
-  /** Field description */
-  private GroupManager groupManager;
 }
diff --git a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/RepositoryResource.java b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/RepositoryResource.java
index 644c6d27c8..f1203490d4 100644
--- a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/RepositoryResource.java
+++ b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/RepositoryResource.java
@@ -47,27 +47,26 @@ import sonia.scm.repository.Repository;
 import sonia.scm.repository.RepositoryException;
 import sonia.scm.repository.RepositoryHandler;
 import sonia.scm.repository.RepositoryManager;
+import sonia.scm.util.HttpUtil;
 import sonia.scm.web.security.WebSecurityContext;
 
 //~--- JDK imports ------------------------------------------------------------
 
-import java.io.IOException;
-
 import java.util.ArrayList;
 import java.util.Collection;
 
 import javax.servlet.http.HttpServletRequest;
 
 import javax.ws.rs.Path;
-import sonia.scm.util.HttpUtil;
 
 /**
  *
  * @author Sebastian Sdorra
  */
-@Path("repositories")
 @Singleton
-public class RepositoryResource extends AbstractResource<Repository>
+@Path("repositories")
+public class RepositoryResource
+        extends AbstractManagerResource<Repository, RepositoryException>
 {
 
   /** Field description */
@@ -90,6 +89,7 @@ public class RepositoryResource extends AbstractResource<Repository>
           Provider<WebSecurityContext> securityContextProvider,
           Provider<HttpServletRequest> requestProvider)
   {
+    super(repositoryManager);
     this.configuration = configuration;
     this.repositoryManager = repositoryManager;
     this.securityContextProvider = securityContextProvider;
@@ -102,64 +102,14 @@ public class RepositoryResource extends AbstractResource<Repository>
    * Method description
    *
    *
-   * @param item
-   *
-   * @throws IOException
-   * @throws RepositoryException
-   */
-  @Override
-  protected void addItem(Repository item)
-          throws RepositoryException, IOException
-  {
-    repositoryManager.create(item);
-  }
-
-  /**
-   * Method description
-   *
-   *
-   * @param item
-   *
-   * @throws IOException
-   * @throws RepositoryException
-   */
-  @Override
-  protected void removeItem(Repository item)
-          throws RepositoryException, IOException
-  {
-    repositoryManager.delete(item);
-  }
-
-  /**
-   * Method description
-   *
-   *
-   * @param name
-   * @param item
-   *
-   * @throws IOException
-   * @throws RepositoryException
-   */
-  @Override
-  protected void updateItem(String name, Repository item)
-          throws RepositoryException, IOException
-  {
-    repositoryManager.modify(item);
-  }
-
-  //~--- get methods ----------------------------------------------------------
-
-  /**
-   * Method description
-   *
    *
+   * @param repositories
    * @return
    */
   @Override
-  protected Collection<Repository> getAllItems()
+  protected Collection<Repository> prepareForReturn(
+          Collection<Repository> repositories)
   {
-    Collection<Repository> repositories = repositoryManager.getAll();
-
     for (Repository repository : repositories)
     {
       appendUrl(repository);
@@ -169,6 +119,25 @@ public class RepositoryResource extends AbstractResource<Repository>
     return repositories;
   }
 
+  /**
+   * Method description
+   *
+   *
+   * @param repository
+   *
+   * @return
+   */
+  @Override
+  protected Repository prepareForReturn(Repository repository)
+  {
+    appendUrl(repository);
+    prepareRepository(repository);
+
+    return repository;
+  }
+
+  //~--- get methods ----------------------------------------------------------
+
   /**
    * Method description
    *
@@ -183,26 +152,6 @@ public class RepositoryResource extends AbstractResource<Repository>
     return item.getId();
   }
 
-  /**
-   * Method description
-   *
-   *
-   *
-   * @param id
-   *
-   * @return
-   */
-  @Override
-  protected Repository getItem(String id)
-  {
-    Repository repository = repositoryManager.get(id);
-
-    appendUrl(repository);
-    prepareRepository(repository);
-
-    return repository;
-  }
-
   /**
    * Method description
    *
@@ -272,8 +221,6 @@ public class RepositoryResource extends AbstractResource<Repository>
 
   //~--- get methods ----------------------------------------------------------
 
-  
-
   /**
    * Method description
    *
diff --git a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/UserResource.java b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/UserResource.java
index dd7dfb575d..893687b209 100644
--- a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/UserResource.java
+++ b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/UserResource.java
@@ -40,6 +40,7 @@ import com.google.inject.Singleton;
 
 import sonia.scm.security.EncryptionHandler;
 import sonia.scm.user.User;
+import sonia.scm.user.UserException;
 import sonia.scm.user.UserManager;
 import sonia.scm.util.AssertUtil;
 import sonia.scm.util.Util;
@@ -56,7 +57,7 @@ import javax.ws.rs.Path;
  */
 @Path("users")
 @Singleton
-public class UserResource extends AbstractResource<User>
+public class UserResource extends AbstractManagerResource<User, UserException>
 {
 
   /** Field description */
@@ -78,7 +79,7 @@ public class UserResource extends AbstractResource<User>
   public UserResource(UserManager userManager,
                       EncryptionHandler encryptionHandler)
   {
-    this.userManager = userManager;
+    super(userManager);
     this.encryptionHandler = encryptionHandler;
   }
 
@@ -89,14 +90,11 @@ public class UserResource extends AbstractResource<User>
    *
    *
    * @param user
-   *
-   * @throws Exception
    */
   @Override
-  protected void addItem(User user) throws Exception
+  protected void preCreate(User user)
   {
     encryptPassword(user);
-    userManager.create(user);
   }
 
   /**
@@ -104,30 +102,13 @@ public class UserResource extends AbstractResource<User>
    *
    *
    * @param user
-   *
-   * @throws Exception
    */
   @Override
-  protected void removeItem(User user) throws Exception
-  {
-    userManager.delete(user);
-  }
-
-  /**
-   * Method description
-   *
-   *
-   * @param name
-   * @param user
-   *
-   * @throws Exception
-   */
-  @Override
-  protected void updateItem(String name, User user) throws Exception
+  protected void preUpate(User user)
   {
     if (DUMMY_PASSWORT.equals(user.getPassword()))
     {
-      User o = userManager.get(name);
+      User o = manager.get(user.getName());
 
       AssertUtil.assertIsNotNull(o);
       user.setPassword(o.getPassword());
@@ -136,23 +117,19 @@ public class UserResource extends AbstractResource<User>
     {
       encryptPassword(user);
     }
-
-    userManager.modify(user);
   }
 
-  //~--- get methods ----------------------------------------------------------
-
   /**
    * Method description
    *
    *
+   * @param users
+   *
    * @return
    */
   @Override
-  protected Collection<User> getAllItems()
+  protected Collection<User> prepareForReturn(Collection<User> users)
   {
-    Collection<User> users = userManager.getAll();
-
     if (Util.isNotEmpty(users))
     {
       for (User u : users)
@@ -173,30 +150,27 @@ public class UserResource extends AbstractResource<User>
    * @return
    */
   @Override
-  protected String getId(User user)
+  protected User prepareForReturn(User user)
   {
-    return user.getName();
+    user.setPassword(DUMMY_PASSWORT);
+
+    return user;
   }
 
+  //~--- get methods ----------------------------------------------------------
+
   /**
    * Method description
    *
    *
-   * @param name
+   * @param user
    *
    * @return
    */
   @Override
-  protected User getItem(String name)
+  protected String getId(User user)
   {
-    User user = userManager.get(name);
-
-    if (user != null)
-    {
-      user.setPassword(DUMMY_PASSWORT);
-    }
-
-    return user;
+    return user.getName();
   }
 
   /**
@@ -233,7 +207,4 @@ public class UserResource extends AbstractResource<User>
 
   /** Field description */
   private EncryptionHandler encryptionHandler;
-
-  /** Field description */
-  private UserManager userManager;
 }