@Override
  public LogData parse(String line, ParsingContext parsingContext) {

    final StringBuilder unmatchedLog = parsingContext.getUnmatchedLog();
    if (unmatchedLog.length() == 0 && !line.startsWith("{")) {
      return null;
    }

    unmatchedLog.append(line).append("\n");
    final Optional<LogData> logData = jsonExtractor.parseJsonLog(unmatchedLog.toString(), parsingContext.getDateFormat());
    if (logData.isPresent()) {
      unmatchedLog.setLength(0);
      return logData.get();
    }
    return null;
  }
Parser of log in json format. It can skip if between json object are some junk (from standard output). From properties
are taken mappings from Json ~xpath to LogData fields. For example if Json field logMessage contains information about
message, it should be written as message=logMessage
olv-core/src/main/java/pl/otros/logview/parser/json/JsonLogParser.java