code: private void traceReaderInfo( JsonReader reader ) {
          if ( null != reader && getLogger().isLoggable( Level.INFO ) ) {
              getLogger().log( Level.INFO, "Error at line " + reader.getLineNumber() + " and column " + reader
                      .getColumnNumber() + " of input <" + reader.getInput() + ">" );
          }
      }
docs: Trace the current reader state