Map<String, String> result = Maps.fromProperties(testProp);
    assertTrue(result.isEmpty());
    testProp.setProperty("first", "true");

    result = Maps.fromProperties(testProp);
    assertEquals("true", result.get("first"));
    assertEquals(1, result.size());
    testProp.setProperty("second", "null");

    result = Maps.fromProperties(testProp);
    assertEquals("true", result.get("first"));

    Map<String, String> result = Maps.fromProperties(testProp);
    assertTrue(result.isEmpty());
    testProp.setProperty("first", "true");

    result = Maps.fromProperties(testProp);
    assertEquals("true", result.get("first"));
    assertEquals(1, result.size());
    testProp.setProperty("second", "null");

    result = Maps.fromProperties(testProp);
    assertEquals("true", result.get("first"));

        }

        ProjectBuildingRequest config = new DefaultProjectBuildingRequest();

        String localRepoUrl =
                System.getProperty("maven.repo.local", System.getProperty("user.home") + "/.m2/repository");
        localRepoUrl = "file://" + localRepoUrl;
        config.setLocalRepository(repositorySystem.createArtifactRepository(

                break;
            }
        }
        client = createHttpClient(fessConfig, httpAddress);

        if (StringUtil.isNotBlank(httpAddress)) {
            System.setProperty(Constants.FESS_SEARCH_ENGINE_HTTP_ADDRESS, httpAddress);
        }

        waitForYellowStatus(fessConfig);

        indexConfigList.forEach(configName -> {

    default String getSystemProperty(final String key) {
        return ComponentUtil.getSystemProperties().getProperty(key, System.getProperty(Constants.SYSTEM_PROP_PREFIX + key));
    }

    default String getSystemProperty(final String key, final String defaultValue) {
        return ComponentUtil.getSystemProperties().getProperty(key, System.getProperty(Constants.SYSTEM_PROP_PREFIX + key, defaultValue));
    }

            int parallelism = DEFAULT_BUILDER_PARALLELISM;
            try {
                String str = request.getUserProperties().getProperty(BUILDER_PARALLELISM);
                if (str == null) {
                    str = request.getSystemProperties().getProperty(BUILDER_PARALLELISM);
                }
                if (str != null) {
                    parallelism = Integer.parseInt(str);
                }

  static final boolean GENERATE_CANCELLATION_CAUSES;

  static {
    // System.getProperty may throw if the security policy does not permit access.
    boolean generateCancellationCauses;
    try {
      generateCancellationCauses =
          Boolean.parseBoolean(
              System.getProperty("guava.concurrent.generate_cancellation_cause", "false"));
    } catch (SecurityException e) {

                Supplier<? extends Activation.Builder> creator, Activation.Builder builder, Activation target) {
            stk.push(nextFrame("property", Activation::getProperty));
            try {
                return super.transformActivation_Property(creator, builder, target);
            } finally {
                stk.pop();
            }
        }

        @Override