public boolean exists(final String followerId,final String followingId) throws RepositoryException {
  return null != getByFollowerIdAndFollowingId(followerId,followingId);
}

public boolean exists ( final String followerId , final String followingId ) throws RepositoryException { return null != getByFollowerIdAndFollowingId ( followerId , followingId ) ; }
determines whether exists a follow relationship for the specified follower and the specified following entity .
