instanceMethods.add(method);
    }

    MutablePropertyDetails property(String propertyName) {
        MutablePropertyDetails property = properties.get(propertyName);
        if (property == null) {
            property = new MutablePropertyDetails(propertyName);
            properties.put(propertyName, property);
        }
        return property;
    }

    public void field(Field field) {

     * Adds an action to be executed when property lists are transformed.
     * @param action the action to add
     */
    public void addAction(Action<? super T> action) {
        actions.add(action);
    }

    /**
     * Transforms a property list object. This will modify the
     * original.
     * @param original the property list to transform
     * @return the transformed property list
     */
    @Override

        'Property'     | 'String'   | ['--myProp=test']                    | 'test'              | 'provided'
        'Property'     | 'String'   | ['--myProp=ab\'c=123:x\\yz45']       | 'ab\'c=123:x\\yz45' | 'provided with special characters'
        'Property'     | 'String'   | []                                   | 'null '             | 'not provided'

        readOnlyBean.someValue.toString() == "<display name> property 'someValue'"
        readOnlyBeanWithMapping.someValue.toString() == "<display name> property 'someValue'"
        finalBeanWithOverloads.getSomeValue().toString() == "<display name> property 'someValue'"
        beanWithOverloads.getSomeValue().toString() == "<display name> property 'someValue'"

    /**
     * Get the value of property as {@link String}.
     * @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?

            <la:form action="/admin/accesstoken/">
                <la:hidden property="crudMode"/>
                <c:if test="${crudMode==2}">
                    <la:hidden property="id"/>
                    <la:hidden property="versionNo"/>
                </c:if>
                <la:hidden property="createdBy"/>
                <la:hidden property="createdTime"/>
                <div class="row">

                throw new IllegalArgumentException("System property [" + GCS_ENDPOINT_PROPERTY + "=" + property + "]  must be a valid URI");
            }
        }
        return uri;
    }

    private static String configureServicePath(String property) {
        if (StringUtils.isNotBlank(property)) {
           return property;
        } else {
            return null;
        }
    }

        outputContains("get failed: Cannot query the value of task ':producer' property 'output' because configuration of root project 'broken' has not completed yet.")
        outputContains("get from task failed: Cannot query the value of task ':producer' property 'output' because task ':producer' has not completed yet.")
        outputContains("set failed: The value for task ':producer' property 'output' is final and cannot be changed any further.")

        assertThat(
            buildAndFail("myTask").error,
            containsString("Cannot get non-null extra property 'foo' as it does not exist")
        )
    }

    @Test
    fun `non-nullable delegated extra property access of existing null extra property throws`() {

        withBuildScript(
            """
            val myTask = task("myTask") {
                val foo: Int? by extra { null }
            }

    /**
     * The URL of this contributor.
     */
    Property<String> getUrl();

    /**
     * The organization name of this contributor.
     */
    Property<String> getOrganization();

    /**
     * The organization's URL of this contributor.
     */
    Property<String> getOrganizationUrl();

    /**
     * The roles of this contributor.
     */
    SetProperty<String> getRoles();