improve logging and small fixes for active directory authentication, see #28

scm-core/src/main/java/sonia/scm/user/UserAllreadyExistException.java

@@ -33,6 +33,10 @@
 
 package sonia.scm.user;
 
+//~--- non-JDK imports --------------------------------------------------------
+
+import sonia.scm.util.Util;
+
 /**
  *
  * @author Sebastian Sdorra
@@ -42,4 +46,25 @@ public class UserAllreadyExistException extends UserException
 
   /** Field description */
   private static final long serialVersionUID = 9182294539718090814L;
+
+  //~--- constructors ---------------------------------------------------------
+
+  /**
+   * Constructs ...
+   *
+   */
+  public UserAllreadyExistException() {}
+
+  /**
+   * Constructs ...
+   *
+   *
+   * @param username
+   * @since 1.5
+   */
+  public UserAllreadyExistException(String username)
+  {
+    super("user \"".concat(Util.nonNull(username)).concat(
+      "\" allready exists"));
+  }
 }