code: public InputStream openSerialStream(FieldList record, String strLookupKey)
      {
          try
          {
              String strFilePathName = this.getFilename(strLookupKey, false);
              File file = new File(strFilePathName);
              if (file.exists())
              {
                  return new FileInputStream(strFilePathName);
              }
               
          } catch (Exception ex) {
              ex.printStackTrace();
          }
          return null;
      }
docs: Get the physical table that matches this BaseTable and return an Input
  stream to it if it exists.
  @param table The table to get the serial stream for (named ser/dbname/tablename.ser).
  @return The FileInputStream or null if it doesn't exist.