public class StandardSystemPropertyTest extends TestCase {

  public void testGetKeyMatchesString() {
    for (StandardSystemProperty property : StandardSystemProperty.values()) {
      String fieldName = property.name();
      String expected = Ascii.toLowerCase(fieldName).replaceAll("_", ".");
      assertThat(property.key()).isEqualTo(expected);
    }
  }

  public void testGetValue() {

     *
     * @param fieldName the name of the field to get configuration for
     * @return an OptionalThing containing the Config if the field exists and has a non-blank value,
     *         otherwise an empty OptionalThing
     */
    public OptionalThing<Config> getConfig(final String fieldName) {
        final String value = params.get(fieldName);
        if (StringUtil.isNotBlank(value)) {

         *
         * @param source    the source value
         * @param fieldName a description of the field being interpolated. The implementation may use this to
         *                  log stuff
         * @return the interpolated value
         */
        String transform(String source, String fieldName);
    }

        }

        public String fromPropertyNameToFieldName(String propertyName) {
            return propertyName;
        }

        public String fromFieldNameToPropertyName(String fieldName) {
            return fieldName;
        }

        public String fromPropertyNameToGetterName(String propertyName) {
            return "get" + capitalizeName(propertyName);
        }

public class StandardSystemPropertyTest extends TestCase {

  public void testGetKeyMatchesString() {
    for (StandardSystemProperty property : StandardSystemProperty.values()) {
      String fieldName = property.name();
      String expected = Ascii.toLowerCase(fieldName).replaceAll("_", ".");
      assertThat(property.key()).isEqualTo(expected);
    }
  }

  public void testGetValue() {

     * Returns whether the {@link FieldDesc} exists.
     *
     * @param fieldName
     *            The field name. Must not be {@literal null} or empty string
     * @return Whether the {@link FieldDesc} exists
     */
    boolean hasFieldDesc(String fieldName);

    /**
     * Returns the {@link FieldDesc}.
     *
     * @param fieldName
     *            The field name. Must not be {@literal null} or empty string

        Field field = findField(target.getClass(), fieldName);
        field.setAccessible(true);
        field.set(target, value);
    }

    private Field findField(Class<?> clazz, String fieldName) {
        while (clazz != null) {
            try {
                return clazz.getDeclaredField(fieldName);

internal fun <T> readFieldOrNull(
  instance: Any,
  fieldType: Class<T>,
  fieldName: String,
): T? {
  var c: Class<*> = instance.javaClass
  while (c != Any::class.java) {
    try {
      val field = c.getDeclaredField(fieldName)
      field.isAccessible = true
      val value = field.get(instance)

         *
         * @param source    The source value
         * @param fieldName A description of the field being interpolated. The implementation may use this to
         *                  log stuff.
         * @return The interpolated value.
         */
        String transform(String source, String fieldName);
    }

        while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
            final String fieldName = jsonParser.getCurrentName();
            if (fieldName != null) {
                jsonParser.nextToken(); // Move to the value of the current field

                if (jsonParser.getCurrentToken() == JsonToken.START_ARRAY) {
                    nestedMap.put(fieldName, parseArray(jsonParser));