* of the command. Don't call this method twice on an instance.
*
* @return a collection of references in the remote repository
+ * @throws GitAPIException
+ * or subclass thereof when an error occurs
* @throws InvalidRemoteException
* when called with an invalid remote uri
* @throws org.eclipse.jgit.api.errors.TransportException
* Same as {@link #call()}, but return Map instead of Collection.
*
* @return a map from names to references in the remote repository
+ * @throws GitAPIException
+ * or subclass thereof when an error occurs
* @throws InvalidRemoteException
* when called with an invalid remote uri
* @throws org.eclipse.jgit.api.errors.TransportException