import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.GetGroupsForUserRequestProto; //导入依赖的package包/类
@Override
public GetGroupsForUserResponseProto getGroupsForUser(
    RpcController controller, GetGroupsForUserRequestProto request)
    throws ServiceException {
  String user = request.getUser();
  try {
    String[] groups = real.getGroupsForUser(user);
    GetGroupsForUserResponseProto.Builder responseBuilder =
        GetGroupsForUserResponseProto.newBuilder();
    for (String group : groups) {
      responseBuilder.addGroups(group);
    }
    return responseBuilder.build();
  } catch (IOException e) {
    throw new ServiceException(e);
  }
}
 

import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.GetGroupsForUserRequestProto; //导入依赖的package包/类
@Override
public String[] getGroupsForUser(String user) throws IOException {
  GetGroupsForUserRequestProto requestProto = 
      GetGroupsForUserRequestProto.newBuilder().setUser(user).build();
  try {
    GetGroupsForUserResponseProto responseProto =
        proxy.getGroupsForUser(null, requestProto);
    return (String[]) responseProto.getGroupsList().toArray(
        new String[responseProto.getGroupsCount()]);
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }
}