private static PrettyPrinter buildDefaultPrettyPrinter() {
  DefaultPrettyPrinter pp =
      new DefaultPrettyPrinter("") {
        @Override
        public DefaultPrettyPrinter withSeparators(Separators separators) {
          this._separators = separators;
          this._objectFieldValueSeparatorWithSpaces =
              separators.getObjectFieldValueSeparator() + " ";
          return this;
        }
      };
  Indenter lfOnlyIndenter = new DefaultIndenter("  ", "\n");
  pp.indentArraysWith(lfOnlyIndenter);
  pp.indentObjectsWith(lfOnlyIndenter);
  return pp;
}
 

@Override
public void init(Map<String, String> options, ConfigurationSource cfg) {
    super.initCfg(cfg);

    int indent = Integer.parseInt(options.getOrDefault("indent", "4"));
    String lineEnding = options.getOrDefault("lineending", System.lineSeparator());
    boolean spaceBeforeSeparator = Boolean.parseBoolean(options.getOrDefault("spaceBeforeSeparator", "true"));

    formatter = new ObjectMapper();

    // Setup a pretty printer with an indenter (indenter has 4 spaces in this case)
    DefaultPrettyPrinter.Indenter indenter = new DefaultIndenter(Strings.repeat(" ", indent), lineEnding);
    DefaultPrettyPrinter printer = new DefaultPrettyPrinter() {
        private static final long serialVersionUID = 1L;

        @Override
        public DefaultPrettyPrinter createInstance() {
            return new DefaultPrettyPrinter(this);
        }

        @Override
        public DefaultPrettyPrinter withSeparators(Separators separators) {
            this._separators = separators;
            this._objectFieldValueSeparatorWithSpaces = (spaceBeforeSeparator ? " " : "")
                    + separators.getObjectFieldValueSeparator() + " ";
            return this;
        }
    };

    printer.indentObjectsWith(indenter);
    printer.indentArraysWith(indenter);
    formatter.setDefaultPrettyPrinter(printer);
    formatter.enable(SerializationFeature.INDENT_OUTPUT);
}