* @param propertyKey The key of the property. (NotNull)
     * @return The value of found property. (NotNull: if not found, exception)
     * @throws ConfigPropertyNotFoundException When the property is not found.
     */
    String get(String propertyKey);

    /**
     * Is the property true?
     * @param propertyKey The key of the property which is boolean type. (NotNull)

    /**
     * Set the value of hostname, used in parameter comment. <br>
     * Even if empty string, treated as empty plainly. So "IF pmb != null" is false if empty.
     * @param hostname The parameter value of hostname. (NotNull)
     */
    public void setHostname(String hostname) {
        registerVariable("hostname", hostname);
    }

    /**
     * Set the value of clustername, used in parameter comment. <br>

  }

  public void testNotNull_apply() {
    Predicate<@Nullable Integer> notNull = Predicates.notNull();
    assertFalse(notNull.apply(null));
    assertTrue(notNull.apply(1));
  }

  public void testNotNull_equality() {
    new EqualsTester()
        .addEqualityGroup(Predicates.notNull(), Predicates.notNull())
        .addEqualityGroup(Predicates.isNull())
        .testEquals();
  }

  }

  @Override
  public T or(Supplier<? extends T> supplier) {
    return checkNotNull(
        supplier.get(), "use Optional.orNull() instead of a Supplier that returns null");
  }

  @Override
  @CheckForNull
  public T orNull() {
    return null;
  }

  @Override
  public Set<T> asSet() {
    return Collections.emptySet();
  }

  @Override

val signArtifacts: Boolean = !pgpSigningKey.orNull.isNullOrEmpty()

tasks.withType<Sign>().configureEach { isEnabled = signArtifacts }

signing {
    useInMemoryPgpKeys(pgpSigningKey.orNull, pgpSigningPassPhrase.orNull)
    publishing.publications.configureEach {
        if (signArtifacts) {
            signing.sign(this)
        }
    }

val Project.maxTestDistributionRemoteExecutors: Int?
    get() = gradleProperty(MAX_TEST_DISTRIBUTION_REMOTE_EXECUTORS).orNull?.toInt()

val Project.maxTestDistributionLocalExecutors: Int?
    get() = gradleProperty(MAX_TEST_DISTRIBUTION_LOCAL_EXECUTORS).orNull?.toInt()

val Project.toolchainInstallationPaths: Provider<String>
    get() = gradleProperty(JAVA_INSTALLATIONS_PATHS_PROPERTY)

        return this;
    }

    @Override
    public List<String> getModelIds() {
        return modelIds;
    }

    public DefaultModelBuildingResult addModelId(String modelId) {
        // Intentionally notNull because Super POM may not contain a modelId
        Objects.requireNonNull(modelId, "modelId cannot null");

        modelIds.add(modelId);

        return this;
    }

    @Override

  public boolean isPresent() {
    return true;
  }

  @Override
  public T get() {
    return reference;
  }

  @Override
  public T or(T defaultValue) {
    checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)");
    return reference;
  }

  @Override
  public Optional<T> or(Optional<? extends T> secondChoice) {
    checkNotNull(secondChoice);
    return this;
  }

  @Override

        val runningDocsTestTask: Property<Boolean>
    }

    override fun obtain(): String? = parameters.run {

        val buildTimestampFromReceipt = buildTimestampFromBuildReceipt.orNull
        if (buildTimestampFromReceipt != null) {
            println("Using timestamp from incoming build receipt: $buildTimestampFromReceipt")
            return buildTimestampFromReceipt
        }

val artifactoryUrl
    get() = System.getenv("GRADLE_INTERNAL_REPO_URL") ?: ""

val artifactoryUserName
    get() = project.providers.gradleProperty("artifactoryUserName").orNull

val artifactoryUserPassword
    get() = project.providers.gradleProperty("artifactoryUserPassword").orNull

tasks.withType<AbstractPublishToMaven>().configureEach {
    val noUpload = project.gradleProperty("noUpload")