m_Log.logMessage(ex.getMessage());
m_Log.statusMessage("Problem reading " + u); JOptionPane.showMessageDialog(this, "Couldn't read from URL:\n" + u, "Load Instances", JOptionPane.ERROR_MESSAGE);
  protected void setBaseInstancesFromURL(URL u) {    try {      m_Log.statusMessage("Reading from URL...");      Reader r = new BufferedReader(new InputStreamReader(u.openStream()));      setBaseInstances(new Instances(r));      r.close();    } catch (Exception ex) {      m_Log.logMessage(ex.getMessage());    }  }