}

    def "can define task with abstract MapProperty<#keyType, #valueType> getter"() {
        given:
        buildFile << """
            class Param<T> {
                T display
                String toString() { display.toString() }
            }

            abstract class MyTask extends DefaultTask {
                @Input
                abstract MapProperty<$keyType, $valueType> getProp()

        return propertyFactory.setProperty(elementType);
    }

    @Override
    public <K, V> MapProperty<K, V> mapProperty(Class<K> keyType, Class<V> valueType) {
        if (keyType.isPrimitive()) {
            // Kotlin passes these types for its own basic types
            return Cast.uncheckedNonnullCast(mapProperty(JavaReflectionUtil.getWrapperTypeForPrimitiveType(keyType), valueType));
        }

        "MapProperty<String, String>" | "objects.mapProperty(String, String)" | "[:]"                | [:]
        "MapProperty<String, String>" | "objects.mapProperty(String, String)" | "['abc': 'def']"     | ['abc': 'def']
        "MapProperty<String, String>" | "objects.mapProperty(String, String)" | "(Map) null"         | "null"

        "Map<K, V> = Map<K, V>"                  | "="       | "MapProperty<String, MyObject>" | '["a": new MyObject("b")]'                               | '[a:b]'
        "Map<K, V> = Provider<Map<K, V>>"        | "="       | "MapProperty<String, MyObject>" | 'provider { ["a": new MyObject("b")] }'                  | '[a:b]'

    }

    @Override
    public MapProperty<K, V> value(@Nullable Map<? extends K, ? extends V> entries) {
        set(entries);
        return this;
    }

    @Override
    public MapProperty<K, V> value(Provider<? extends Map<? extends K, ? extends V>> provider) {
        set(provider);
        return this;
    }

    interface Params : BuildServiceParameters {
        val projectStates: MapProperty<String, TestFilesCleanupProjectState>
        val rootBuildDir: DirectoryProperty

        /**
         * Key is the path of a task, value is the possible report dirs it generates.
         */
        val taskPathToReports: MapProperty<String, List<File>>

        /**

        "MapProperty<String, String>" | "objects.mapProperty(String, String)" | "[:]"                | [:]
        "MapProperty<String, String>" | "objects.mapProperty(String, String)" | "['abc': 'def']"     | ['abc': 'def']
        "MapProperty<String, String>" | "objects.mapProperty(String, String)" | "null"               | "null"

You can create a `MapProperty` instance using link:{javadocPath}/org/gradle/api/model/ObjectFactory.html#mapProperty-java.lang.Class-java.lang.Class-[ObjectFactory.mapProperty(Class, Class)].

     * @param valueType the type of value.
     * @param <K> the type of key.
     * @param <V> the type of value.
     * @return the property. Never returns null.
     * @since 5.1
     */
    <K, V> MapProperty<K, V> mapProperty(Class<K> keyType, Class<V> valueType);

    /**
     * Creates a new {@link DirectoryProperty} that uses the project directory to resolve relative paths, if required. The property has no initial value.
     *

            Property<Object> asProperty = Cast.uncheckedNonnullCast(target);
            asProperty.convention(new DefaultProvider<>(() -> mapping.getValue(_convention, _source)));
        } else if (target instanceof MapProperty) {
            MapProperty<Object, Object> asMapProperty = Cast.uncheckedNonnullCast(target);