diff --git a/scm-core/src/main/java/sonia/scm/HandlerBase.java b/scm-core/src/main/java/sonia/scm/HandlerBase.java
index 0baea8d929..8e6b12ba79 100644
--- a/scm-core/src/main/java/sonia/scm/HandlerBase.java
+++ b/scm-core/src/main/java/sonia/scm/HandlerBase.java
@@ -59,7 +59,7 @@ public interface HandlerBase<T extends TypedObject, E extends Exception>
    * @throws E
    * @throws IOException
    */
-  public void create(T object) throws E, IOException;
+  public void create(T object) throws E;
 
   /**
    * Removes a persistent object.
@@ -70,7 +70,7 @@ public interface HandlerBase<T extends TypedObject, E extends Exception>
    * @throws E
    * @throws IOException
    */
-  public void delete(T object) throws E, IOException;
+  public void delete(T object) throws E;
 
   /**
    * Modifies a persistent object.
@@ -81,5 +81,5 @@ public interface HandlerBase<T extends TypedObject, E extends Exception>
    * @throws E
    * @throws IOException
    */
-  public void modify(T object) throws E, IOException;
+  public void modify(T object) throws E;
 }
diff --git a/scm-core/src/main/java/sonia/scm/Manager.java b/scm-core/src/main/java/sonia/scm/Manager.java
index 79155b56a2..c0d074520a 100644
--- a/scm-core/src/main/java/sonia/scm/Manager.java
+++ b/scm-core/src/main/java/sonia/scm/Manager.java
@@ -33,7 +33,6 @@
 
 package sonia.scm;
 
-import java.io.IOException;
 import java.util.Collection;
 import java.util.Comparator;
 
@@ -56,9 +55,8 @@ public interface Manager<T extends ModelObject, E extends Exception>
    * @param object to refresh
    *
    * @throws E
-   * @throws IOException
    */
-  void refresh(T object) throws E, IOException;
+  void refresh(T object) throws E;
 
   //~--- get methods ----------------------------------------------------------
 
diff --git a/scm-core/src/main/java/sonia/scm/ManagerDecorator.java b/scm-core/src/main/java/sonia/scm/ManagerDecorator.java
index af0215202c..99707c4c4d 100644
--- a/scm-core/src/main/java/sonia/scm/ManagerDecorator.java
+++ b/scm-core/src/main/java/sonia/scm/ManagerDecorator.java
@@ -35,7 +35,6 @@ package sonia.scm;
 //~--- JDK imports ------------------------------------------------------------
 
 import java.io.IOException;
-
 import java.util.Collection;
 import java.util.Comparator;
 
@@ -78,7 +77,7 @@ public class ManagerDecorator<T extends ModelObject, E extends Exception>
    * {@inheritDoc}
    */
   @Override
-  public void create(T object) throws E, IOException
+  public void create(T object) throws E
   {
     decorated.create(object);
   }
@@ -87,7 +86,7 @@ public class ManagerDecorator<T extends ModelObject, E extends Exception>
    * {@inheritDoc}
    */
   @Override
-  public void delete(T object) throws E, IOException
+  public void delete(T object) throws E
   {
     decorated.delete(object);
   }
@@ -105,7 +104,7 @@ public class ManagerDecorator<T extends ModelObject, E extends Exception>
    * {@inheritDoc}
    */
   @Override
-  public void modify(T object) throws E, IOException
+  public void modify(T object) throws E
   {
     decorated.modify(object);
   }
@@ -114,7 +113,7 @@ public class ManagerDecorator<T extends ModelObject, E extends Exception>
    * {@inheritDoc}
    */
   @Override
-  public void refresh(T object) throws E, IOException
+  public void refresh(T object) throws E
   {
     decorated.refresh(object);
   }
diff --git a/scm-core/src/main/java/sonia/scm/group/GroupAlreadyExistsException.java b/scm-core/src/main/java/sonia/scm/group/GroupAlreadyExistsException.java
index 8389900098..e63ee1d78b 100644
--- a/scm-core/src/main/java/sonia/scm/group/GroupAlreadyExistsException.java
+++ b/scm-core/src/main/java/sonia/scm/group/GroupAlreadyExistsException.java
@@ -48,9 +48,9 @@ public class GroupAlreadyExistsException extends GroupException
   /**
    * Constructs a new instance.
    * 
-   * @param message exception message
+   * @param name The name (aka id) of the group
    */
-  public GroupAlreadyExistsException(String message) {
-    super(message);
+  public GroupAlreadyExistsException(String name) {
+    super(name + " group already exists");
   }
 }
diff --git a/scm-core/src/main/java/sonia/scm/group/GroupNotFoundException.java b/scm-core/src/main/java/sonia/scm/group/GroupNotFoundException.java
index f4b9934128..d4c06a1559 100644
--- a/scm-core/src/main/java/sonia/scm/group/GroupNotFoundException.java
+++ b/scm-core/src/main/java/sonia/scm/group/GroupNotFoundException.java
@@ -52,39 +52,7 @@ public class GroupNotFoundException extends GroupException
    * Constructs a new GroupNotFoundException.
    *
    */
-  public GroupNotFoundException() {}
-
-  /**
-   * Constructs a new GroupNotFoundException.
-   *
-   *
-   * @param message message for the exception
-   */
-  public GroupNotFoundException(String message)
-  {
-    super(message);
-  }
-
-  /**
-   * Constructs a new GroupNotFoundException.
-   *
-   *
-   * @param throwable root cause
-   */
-  public GroupNotFoundException(Throwable throwable)
-  {
-    super(throwable);
-  }
-
-  /**
-   * Constructs a new GroupNotFoundException.
-   *
-   *
-   * @param message message for the exception
-   * @param throwable root cause
-   */
-  public GroupNotFoundException(String message, Throwable throwable)
-  {
-    super(message, throwable);
+  public GroupNotFoundException() {
+    super("group does not exists");
   }
 }
diff --git a/scm-core/src/main/java/sonia/scm/repository/AbstractSimpleRepositoryHandler.java b/scm-core/src/main/java/sonia/scm/repository/AbstractSimpleRepositoryHandler.java
index 670cab93e1..957142bae5 100644
--- a/scm-core/src/main/java/sonia/scm/repository/AbstractSimpleRepositoryHandler.java
+++ b/scm-core/src/main/java/sonia/scm/repository/AbstractSimpleRepositoryHandler.java
@@ -38,23 +38,20 @@ package sonia.scm.repository;
 import com.google.common.base.Charsets;
 import com.google.common.base.Throwables;
 import com.google.common.io.Resources;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
 import sonia.scm.ConfigurationException;
 import sonia.scm.io.CommandResult;
 import sonia.scm.io.ExtendedCommand;
 import sonia.scm.io.FileSystem;
+import sonia.scm.store.ConfigurationStoreFactory;
 import sonia.scm.util.IOUtil;
 
-//~--- JDK imports ------------------------------------------------------------
-
 import java.io.File;
 import java.io.IOException;
-
 import java.net.URL;
-import sonia.scm.store.ConfigurationStoreFactory;
+
+//~--- JDK imports ------------------------------------------------------------
 
 /**
  *
@@ -109,7 +106,7 @@ public abstract class AbstractSimpleRepositoryHandler<C extends SimpleRepository
    */
   @Override
   public void create(Repository repository)
-          throws RepositoryException, IOException
+          throws RepositoryException
   {
     File directory = getDirectory(repository);
 
@@ -137,11 +134,14 @@ public abstract class AbstractSimpleRepositoryHandler<C extends SimpleRepository
               directory);
         }
 
-        fileSystem.destroy(directory);
+        try {
+          fileSystem.destroy(directory);
+        } catch (IOException e) {
+          logger.error("could not delete directory after failed repository creation: {}", directory, e);
+        }
       }
 
-      Throwables.propagateIfPossible(ex, RepositoryException.class,
-                                     IOException.class);
+      Throwables.propagateIfPossible(ex, RepositoryException.class);
     }
   }
 
@@ -173,14 +173,17 @@ public abstract class AbstractSimpleRepositoryHandler<C extends SimpleRepository
    * @throws RepositoryException
    */
   @Override
-  public void delete(Repository repository)
-          throws RepositoryException, IOException
+  public void delete(Repository repository) throws RepositoryException
   {
     File directory = getDirectory(repository);
 
     if (directory.exists())
     {
-      fileSystem.destroy(directory);
+      try {
+        fileSystem.destroy(directory);
+      } catch (IOException e) {
+        throw new RepositoryException("could not delete repository", e);
+      }
       cleanupEmptyDirectories(config.getRepositoryDirectory(),
                               directory.getParentFile());
     }
@@ -232,8 +235,7 @@ public abstract class AbstractSimpleRepositoryHandler<C extends SimpleRepository
    * @throws RepositoryException
    */
   @Override
-  public void modify(Repository repository)
-          throws RepositoryException, IOException
+  public void modify(Repository repository) throws RepositoryException
   {
 
     // nothing todo
diff --git a/scm-core/src/main/java/sonia/scm/security/SyncingRealmHelper.java b/scm-core/src/main/java/sonia/scm/security/SyncingRealmHelper.java
index 4c5b5c4e53..9e0c97f234 100644
--- a/scm-core/src/main/java/sonia/scm/security/SyncingRealmHelper.java
+++ b/scm-core/src/main/java/sonia/scm/security/SyncingRealmHelper.java
@@ -30,12 +30,10 @@ package sonia.scm.security;
 
 import com.google.common.collect.ImmutableList;
 import com.google.inject.Inject;
-
 import org.apache.shiro.authc.AuthenticationException;
 import org.apache.shiro.authc.AuthenticationInfo;
 import org.apache.shiro.authc.SimpleAuthenticationInfo;
 import org.apache.shiro.subject.SimplePrincipalCollection;
-
 import sonia.scm.group.Group;
 import sonia.scm.group.GroupException;
 import sonia.scm.group.GroupManager;
@@ -46,9 +44,6 @@ import sonia.scm.user.UserException;
 import sonia.scm.user.UserManager;
 import sonia.scm.web.security.AdministrationContext;
 
-
-import java.io.IOException;
-
 import java.util.Collection;
 
 /**
@@ -134,7 +129,7 @@ public final class SyncingRealmHelper {
           groupManager.create(group);
         }
       }
-      catch (GroupException | IOException ex) {
+      catch (GroupException ex) {
         throw new AuthenticationException("could not store group", ex);
       }
     });
@@ -155,7 +150,7 @@ public final class SyncingRealmHelper {
           userManager.create(user);
         }
       }
-      catch (UserException | IOException ex) {
+      catch (UserException ex) {
         throw new AuthenticationException("could not store user", ex);
       }
     });
diff --git a/scm-core/src/main/java/sonia/scm/user/UserAlreadyExistsException.java b/scm-core/src/main/java/sonia/scm/user/UserAlreadyExistsException.java
index 8c8f2542f0..52b91fa229 100644
--- a/scm-core/src/main/java/sonia/scm/user/UserAlreadyExistsException.java
+++ b/scm-core/src/main/java/sonia/scm/user/UserAlreadyExistsException.java
@@ -49,11 +49,11 @@ public class UserAlreadyExistsException extends UserException
   /**
    * Constructs a new instance.
    *
-   * @param message message of exception
+   * @param name The name (aka id) of the user
    * @since 1.5
    */
-  public UserAlreadyExistsException(String message)
+  public UserAlreadyExistsException(String name)
   {
-    super(message);
+    super(name + " user already exists");
   }
 }
diff --git a/scm-core/src/main/java/sonia/scm/user/UserNotFoundException.java b/scm-core/src/main/java/sonia/scm/user/UserNotFoundException.java
index 16ee045a75..e5755c2546 100644
--- a/scm-core/src/main/java/sonia/scm/user/UserNotFoundException.java
+++ b/scm-core/src/main/java/sonia/scm/user/UserNotFoundException.java
@@ -51,39 +51,7 @@ public class UserNotFoundException extends UserException
    * Constructs a new UserNotFoundException.
    *
    */
-  public UserNotFoundException() {}
-
-  /**
-   * Constructs a new UserNotFoundException.
-   *
-   *
-   * @param message message for the exception
-   */
-  public UserNotFoundException(String message)
-  {
-    super(message);
-  }
-
-  /**
-   * Constructs a new UserNotFoundException.
-   *
-   *
-   * @param throwable root cause
-   */
-  public UserNotFoundException(Throwable throwable)
-  {
-    super(throwable);
-  }
-
-  /**
-   * Constructs a new UserNotFoundException.
-   *
-   *
-   * @param message message for the exception
-   * @param throwable root cause
-   */
-  public UserNotFoundException(String message, Throwable throwable)
-  {
-    super(message, throwable);
+  public UserNotFoundException() {
+    super("user does not exists");
   }
 }
diff --git a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/RepositoryImportResource.java b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/RepositoryImportResource.java
index 0fe6f8df1d..f336bbb6e7 100644
--- a/scm-webapp/src/main/java/sonia/scm/api/rest/resources/RepositoryImportResource.java
+++ b/scm-webapp/src/main/java/sonia/scm/api/rest/resources/RepositoryImportResource.java
@@ -40,12 +40,13 @@ import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.io.Files;
 import com.google.inject.Inject;
-
+import com.webcohesion.enunciate.metadata.rs.ResponseCode;
+import com.webcohesion.enunciate.metadata.rs.ResponseHeader;
+import com.webcohesion.enunciate.metadata.rs.StatusCodes;
+import com.webcohesion.enunciate.metadata.rs.TypeHint;
 import org.apache.shiro.SecurityUtils;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
 import sonia.scm.NotSupportedFeatuerException;
 import sonia.scm.Type;
 import sonia.scm.api.rest.RestActionUploadResult;
@@ -65,26 +66,6 @@ import sonia.scm.repository.api.UnbundleCommandBuilder;
 import sonia.scm.security.Role;
 import sonia.scm.util.IOUtil;
 
-import static com.google.common.base.Preconditions.*;
-
-//~--- JDK imports ------------------------------------------------------------
-
-import com.webcohesion.enunciate.metadata.rs.ResponseCode;
-import com.webcohesion.enunciate.metadata.rs.ResponseHeader;
-import com.webcohesion.enunciate.metadata.rs.StatusCodes;
-import com.webcohesion.enunciate.metadata.rs.TypeHint;
-
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
-
-import java.net.URI;
-
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
-import java.util.Set;
-
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DefaultValue;
 import javax.ws.rs.FormParam;
@@ -100,10 +81,22 @@ import javax.ws.rs.core.GenericEntity;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.UriInfo;
-
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlRootElement;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+//~--- JDK imports ------------------------------------------------------------
 
 /**
  * Rest resource for importing repositories.
@@ -564,10 +557,6 @@ public class RepositoryImportResource
     {
       handleGenericCreationFailure(ex, type, name);
     }
-    catch (IOException ex)
-    {
-      handleGenericCreationFailure(ex, type, name);
-    }
 
     return repository;
   }
@@ -716,10 +705,6 @@ public class RepositoryImportResource
     {
       manager.delete(repository);
     }
-    catch (IOException e)
-    {
-      logger.error("can not delete repository", e);
-    }
     catch (RepositoryException e)
     {
       logger.error("can not delete repository", e);
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 1b48f66503..bf974b2fa4 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
@@ -210,9 +210,9 @@ public class RepositoryResource extends AbstractManagerResource<Repository, Repo
         logger.warn("delete not allowed", ex);
         response = Response.status(Response.Status.FORBIDDEN).build();
       }
-      catch (RepositoryException | IOException ex)
+      catch (RepositoryException ex)
       {
-        logger.error("error during create", ex);
+        logger.error("error during delete", ex);
         response = createErrorResponse(ex);
       }
     }
diff --git a/scm-webapp/src/main/java/sonia/scm/group/DefaultGroupManager.java b/scm-webapp/src/main/java/sonia/scm/group/DefaultGroupManager.java
index b4e9df2430..0646b109d8 100644
--- a/scm-webapp/src/main/java/sonia/scm/group/DefaultGroupManager.java
+++ b/scm-webapp/src/main/java/sonia/scm/group/DefaultGroupManager.java
@@ -51,7 +51,12 @@ import sonia.scm.util.CollectionAppender;
 import sonia.scm.util.Util;
 
 import java.io.IOException;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.LinkedList;
+import java.util.List;
 
 //~--- JDK imports ------------------------------------------------------------
 
@@ -106,7 +111,7 @@ public class DefaultGroupManager extends AbstractGroupManager
    * @throws IOException
    */
   @Override
-  public void create(Group group) throws GroupException, IOException
+  public void create(Group group) throws GroupException
   {
     String type = group.getType();
 
@@ -127,7 +132,7 @@ public class DefaultGroupManager extends AbstractGroupManager
     
     if (groupDAO.contains(name))
     {
-      throw new GroupAlreadyExistsException(name.concat(" group already exists"));
+      throw new GroupAlreadyExistsException(name);
     }
 
     removeDuplicateMembers(group);
@@ -147,7 +152,7 @@ public class DefaultGroupManager extends AbstractGroupManager
    * @throws IOException
    */
   @Override
-  public void delete(Group group) throws GroupException, IOException
+  public void delete(Group group) throws GroupException
   {
     if (logger.isInfoEnabled())
     {
@@ -166,7 +171,7 @@ public class DefaultGroupManager extends AbstractGroupManager
     }
     else
     {
-      throw new GroupNotFoundException("user does not exists");
+      throw new GroupNotFoundException();
     }
   }
 
@@ -189,7 +194,7 @@ public class DefaultGroupManager extends AbstractGroupManager
    * @throws IOException
    */
   @Override
-  public void modify(Group group) throws GroupException, IOException
+  public void modify(Group group) throws GroupException
   {
     if (logger.isInfoEnabled())
     {
@@ -212,7 +217,7 @@ public class DefaultGroupManager extends AbstractGroupManager
     }
     else
     {
-      throw new GroupNotFoundException("group does not exists");
+      throw new GroupNotFoundException();
     }
   }
 
@@ -226,7 +231,7 @@ public class DefaultGroupManager extends AbstractGroupManager
    * @throws IOException
    */
   @Override
-  public void refresh(Group group) throws GroupException, IOException
+  public void refresh(Group group) throws GroupException
   {
     String name = group.getName();
     if (logger.isInfoEnabled())
@@ -239,7 +244,7 @@ public class DefaultGroupManager extends AbstractGroupManager
 
     if (fresh == null)
     {
-      throw new GroupNotFoundException("group does not exists");
+      throw new GroupNotFoundException();
     }
 
     fresh.copyProperties(group);
diff --git a/scm-webapp/src/main/java/sonia/scm/repository/DefaultRepositoryManager.java b/scm-webapp/src/main/java/sonia/scm/repository/DefaultRepositoryManager.java
index 00271a75cb..33b6486cbc 100644
--- a/scm-webapp/src/main/java/sonia/scm/repository/DefaultRepositoryManager.java
+++ b/scm-webapp/src/main/java/sonia/scm/repository/DefaultRepositoryManager.java
@@ -139,7 +139,7 @@ public class DefaultRepositoryManager extends AbstractRepositoryManager {
    * @throws RepositoryException
    */
   public void create(Repository repository, boolean initRepository)
-    throws RepositoryException, IOException {
+    throws RepositoryException {
     logger.info("create repository {} of type {}", repository.getName(),
       repository.getType());
 
@@ -174,7 +174,7 @@ public class DefaultRepositoryManager extends AbstractRepositoryManager {
    */
   @Override
   public void create(Repository repository)
-    throws RepositoryException, IOException {
+    throws RepositoryException {
     create(repository, true);
   }
 
@@ -189,7 +189,7 @@ public class DefaultRepositoryManager extends AbstractRepositoryManager {
    */
   @Override
   public void delete(Repository repository)
-    throws RepositoryException, IOException {
+    throws RepositoryException {
     if (logger.isInfoEnabled()) {
       logger.info("delete repository {} of type {}", repository.getName(),
         repository.getType());
@@ -249,7 +249,7 @@ public class DefaultRepositoryManager extends AbstractRepositoryManager {
    */
   @Override
   public void modify(Repository repository)
-    throws RepositoryException, IOException {
+    throws RepositoryException {
     if (logger.isInfoEnabled()) {
       logger.info("modify repository {} of type {}", repository.getName(),
         repository.getType());
@@ -284,7 +284,7 @@ public class DefaultRepositoryManager extends AbstractRepositoryManager {
    */
   @Override
   public void refresh(Repository repository)
-    throws RepositoryException, IOException {
+    throws RepositoryException {
     AssertUtil.assertIsNotNull(repository);
     RepositoryPermissions.read(repository).check();
 
diff --git a/scm-webapp/src/main/java/sonia/scm/repository/LastModifiedUpdateListener.java b/scm-webapp/src/main/java/sonia/scm/repository/LastModifiedUpdateListener.java
index f8afe61200..bf868b2027 100644
--- a/scm-webapp/src/main/java/sonia/scm/repository/LastModifiedUpdateListener.java
+++ b/scm-webapp/src/main/java/sonia/scm/repository/LastModifiedUpdateListener.java
@@ -35,10 +35,8 @@ package sonia.scm.repository;
 
 import com.google.common.eventbus.Subscribe;
 import com.google.inject.Inject;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
 import sonia.scm.EagerSingleton;
 import sonia.scm.plugin.Extension;
 import sonia.scm.web.security.AdministrationContext;
@@ -46,8 +44,6 @@ import sonia.scm.web.security.PrivilegedAction;
 
 //~--- JDK imports ------------------------------------------------------------
 
-import java.io.IOException;
-
 /**
  *
  * @author Sebastian Sdorra
@@ -154,7 +150,7 @@ public final class LastModifiedUpdateListener
         {
           repositoryManager.modify(dbr);
         }
-        catch (RepositoryException | IOException ex)
+        catch (RepositoryException ex)
         {
           logger.error("could not modify repository", ex);
         }
diff --git a/scm-webapp/src/main/java/sonia/scm/user/DefaultUserManager.java b/scm-webapp/src/main/java/sonia/scm/user/DefaultUserManager.java
index 72ead40c58..7d6a45b790 100644
--- a/scm-webapp/src/main/java/sonia/scm/user/DefaultUserManager.java
+++ b/scm-webapp/src/main/java/sonia/scm/user/DefaultUserManager.java
@@ -137,7 +137,7 @@ public class DefaultUserManager extends AbstractUserManager
    * @throws UserException
    */
   @Override
-  public void create(User user) throws UserException, IOException
+  public void create(User user) throws UserException
   {
     String type = user.getType();
 
@@ -155,7 +155,7 @@ public class DefaultUserManager extends AbstractUserManager
 
     if (userDAO.contains(user.getName()))
     {
-      throw new UserAlreadyExistsException(user.getName().concat(" user already exists"));
+      throw new UserAlreadyExistsException(user.getName());
     }
 
     AssertUtil.assertIsValid(user);
@@ -175,7 +175,7 @@ public class DefaultUserManager extends AbstractUserManager
    * @throws UserException
    */
   @Override
-  public void delete(User user) throws UserException, IOException
+  public void delete(User user) throws UserException
   {
     if (logger.isInfoEnabled())
     {
@@ -193,7 +193,7 @@ public class DefaultUserManager extends AbstractUserManager
     }
     else
     {
-      throw new UserNotFoundException("user does not exists");
+      throw new UserNotFoundException();
     }
   }
 
@@ -224,7 +224,7 @@ public class DefaultUserManager extends AbstractUserManager
    * @throws UserException
    */
   @Override
-  public void modify(User user) throws UserException, IOException
+  public void modify(User user) throws UserException
   {
     String name = user.getName();
     if (logger.isInfoEnabled())
@@ -245,7 +245,7 @@ public class DefaultUserManager extends AbstractUserManager
     }
     else
     {
-      throw new UserNotFoundException("user does not exists");
+      throw new UserNotFoundException();
     }
   }
 
@@ -259,7 +259,7 @@ public class DefaultUserManager extends AbstractUserManager
    * @throws UserException
    */
   @Override
-  public void refresh(User user) throws UserException, IOException
+  public void refresh(User user) throws UserException
   {
     if (logger.isInfoEnabled())
     {
@@ -271,7 +271,7 @@ public class DefaultUserManager extends AbstractUserManager
 
     if (fresh == null)
     {
-      throw new UserNotFoundException("user does not exists");
+      throw new UserNotFoundException();
     }
 
     fresh.copyProperties(user);