<artifactId>wildfly-clustering-singleton-api</artifactId>

It worked for me.

Thanks.

I am using the below code.

public static final ServiceName SINGLETON_SERVICE_NAME =   ServiceName.JBOSS.append("ha", "singleton");

    private static final String CONTAINER_NAME = "server";

    private static final String CACHE_NAME = "default";

    @Override

    public void activate(ServiceActivatorContext context) throws ServiceRegistryException {

        int quorum = 1;

        InjectedValue<ServerEnvironment> env = new InjectedValue<>();

        SingletonServiceClient srv = new SingletonServiceClient(env);

        ServiceController<?> factoryService = context.getServiceRegistry().getRequiredService(SingletonServiceName.BUILDER.getServiceName(CONTAINER_NAME, CACHE_NAME));

        SingletonServiceBuilderFactory factory = (SingletonServiceBuilderFactory) factoryService.getValue();

        SingletonElectionPolicy policy = new SimpleSingletonElectionPolicy(0);

        factory.createSingletonServiceBuilder(SINGLETON_SERVICE_NAME, srv)

        .requireQuorum(quorum)

        .electionPolicy(policy)

        .build(new DelegatingServiceContainer(context.getServiceTarget(), context.getServiceRegistry()))

        .addDependency(ServerEnvironmentService.SERVICE_NAME, ServerEnvironment.class, env)

        .setInitialMode(ServiceController.Mode.ACTIVE)

        .install();

    }