Custom Nifi Controller properties do not appear

[#1]

Hello friends,

I wrote a custom processor and now wanted to add a custom controller. The problem is, that the properties I wrote for the controller do not appear when I create the service. I followed the structure of this controller: https://github.com/Automna/NiFi/blob/master/nifi-rel-nifi-1.1.2/nifi-nar-bundles/nifi-standard-servi...

Here is what I did so far:

public class MyNewControllerService extends AbstractControllerService implements MyControllerService {

    public static final PropertyDescriptor USERNAME = new PropertyDescriptor.Builder()
            .name("Username")
            .expressionLanguageSupported(ExpressionLanguageScope.NONE)
            .displayName("Set username")
            .required(true)
            .defaultValue("User")
            .description("Username to login to graph service")
            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
            .build();

    public static final PropertyDescriptor PASSWORD = new PropertyDescriptor.Builder().
            name("Password")
            .expressionLanguageSupported(ExpressionLanguageScope.NONE)
            .displayName("Set password")
            .required(true)
            .defaultValue("password")
            .description("Password to login to graph service")
            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
            .build();

    public static final PropertyDescriptor URL = new PropertyDescriptor.Builder().
            name("ApiUrl")
            .expressionLanguageSupported(ExpressionLanguageScope.NONE)
            .displayName("Set url")
            .required(true)
            .defaultValue("url")
            .description("Full url to api")
            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
            .build();

    private static final List<PropertyDescriptor> properties;
    static {
        final List<PropertyDescriptor> props = new ArrayList<>();
        props.add(USERNAME);
        props.add(PASSWORD);
        props.add(URL);

        properties = Collections.unmodifiableList(props);
    }

    OkHttpClient client = new OkHttpClient();
    private static ObjectMapper mapper = new ObjectMapper();

    @Override
    protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
        return properties;
    }

    @OnEnabled
    public void onConfigured(final ConfigurationContext context) throws InitializationException {
        final String user = context.getProperty(USERNAME).getValue();
        final String password = context.getProperty(PASSWORD).getValue();
        final String url = context.getProperty(URL).getValue();

What is missing that I only get a blank properties page?

[#2 · Accepted solution]

Just for everyones information; There was nothing wrong with the code. It was simply that the docker image I used to run Nifi did not build properly and therefore my modifications weren't taken into account.