/**
     * Returns a map of user-defined properties for the Maven execution.
     * These properties can be set using the -D command-line option.
     *
     * @return an unmodifiable map of user properties
     */
    @Nonnull
    Map<String, String> userProperties();

    /**
     * Returns a map of system properties for the Maven execution.

    }

    public ProjectBuilderConfiguration setUserProperties(Properties userProperties) {
        this.userProperties = userProperties;
        return this;
    }

    public Properties getUserProperties() {
        if (userProperties == null) {
            userProperties = new Properties();
        }

        return userProperties;
    }

    public Properties getExecutionProperties() {
        return executionProperties;

                      description: Traffic policies that apply to this subset.
                      properties:
                        connectionPool:
                          properties:
                            http:
                              description: HTTP connection pool settings.
                              properties:
                                h2UpgradePolicy:
                                  description: |-

        Properties props = new Properties();
        props.putAll(this.properties);
        return new BaseContext(new PropertyConfiguration(props));
    }


    protected Map<String, String> getProperties () {
        return this.properties;
    }


    protected String getRequiredProperty ( String prop ) {
        String val = this.properties.get(prop);

            "overrides": [
               {
                  "matcher": {
                     "id": "byName",
                     "options": "Value #requests"
                  },
                  "properties": [
                     {
                        "id": "displayName",
                        "value": "Requests"
                     },
                     {
                        "id": "decimals",

    /**
     * <p>The implementation supports indexed, nested and mapped properties.</p>
     * <ul>
     * <li>nested properties should be defined by a dot, i.e. "user.address.street"</li>
     * <li>indexed properties (java.util.List or array instance) should be contains <code>(\\w+)\\[(\\d+)\\]</code>
     * pattern, i.e. "user.addresses[1].street"</li>
     * <li>mapped properties should be contains <code>(\\w+)\\((.+)\\)</code> pattern,

            "schemas": {
                "Item": {
                    "title": "Item",
                    "required": ["name", "price"],
                    "type": "object",
                    "properties": {
                        "name": {"title": "Name", "type": "string"},
                        "description": {
                            "title": "Description",

    }

    private
    fun createProperties() = Properties().also { properties ->
        properties["runtime"] = runtime.get().joinToString(",")
        properties["projects"] = projects.get().joinToString(",")
        optionalProjects.get().takeIf { it.isNotEmpty() }?.let { optional ->
            properties["optional"] = optional.joinForProperties()
        }
    }

    private

            }
        },
        "components": {
            "schemas": {
                "Item": {
                    "type": "object",
                    "title": "Item",
                    "properties": {
                        "name": {
                            "anyOf": [{"type": "string"}, {"type": "null"}],
                            "title": "Name",
                        },

                  "properties": [
                     {
                        "id": "displayName",
                        "value": "Listeners"
                     }
                  ]
               },
               {
                  "matcher": {
                     "id": "byName",
                     "options": "rds"
                  },
                  "properties": [
                     {