Thanks for your answer but it didn't help.

Still can't inject scheduler ejb.

2014-03-13 21:19:36,096 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-7) MSC000001: Failed to start service jboss.quickstart.ha.singleton.default.service: org.jboss.msc.service.StartException in service jboss.quickstart.ha.singleton.default.service: Could not initialize timer
  at org.jboss.as.quickstarts.cluster.hasingleton.service.ejb.HATimerService.start(HATimerService.java:67)
  at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948) [jboss-msc-1.2.0.Final.jar:1.2.0.Final]
  at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881) [jboss-msc-1.2.0.Final.jar:1.2.0.Final]
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_45]
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_45]
  at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_45]
Caused by: java.lang.NullPointerException
  at org.jboss.as.quickstarts.cluster.hasingleton.service.ejb.HATimerService.start(HATimerService.java:65)
  ... 5 more


2014-03-13 21:19:36,097 ERROR [org.wildfly.clustering.server.singleton] (ServerService Thread Pool -- 81) JBAS010344: Failed to start jboss.quickstart.ha.singleton.default.service service: org.jboss.msc.service.StartException in service jboss.quickstart.ha.singleton.default.service: Could not initialize timer
  at org.jboss.as.quickstarts.cluster.hasingleton.service.ejb.HATimerService.start(HATimerService.java:67)
  at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948) [jboss-msc-1.2.0.Final.jar:1.2.0.Final]
  at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881) [jboss-msc-1.2.0.Final.jar:1.2.0.Final]
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_45]
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_45]
  at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_45]
Caused by: java.lang.NullPointerException
  at org.jboss.as.quickstarts.cluster.hasingleton.service.ejb.HATimerService.start(HATimerService.java:65)
  ... 5 more

And my code:

public class HATimerService implements Service<Environment> {
    public static final ServiceName DEFAULT_SERVICE_NAME = ServiceName.JBOSS.append("kndzr", "ha", "singleton", "default");
    public static final ServiceName QUORUM_SERVICE_NAME = ServiceName.JBOSS.append("kndzr", "ha", "singleton", "quorum");
    public static final String NODE_1 = "server-one";
    public static final String NODE_2 = "server-two";


    private static final Logger LOGGER = Logger.getLogger(HATimerService.class);   
    private final Value<ServerEnvironment> env;
    private final AtomicBoolean started = new AtomicBoolean(false);


    @EJB
    private SchedulerBean scheduler;


    public HATimerService(Value<ServerEnvironment> env) {
        this.env = env;
    }


    @Override
    public Environment getValue() {
        if (!this.started.get()) {
            throw new IllegalStateException();
        }
        return new Environment(this.env.getValue().getNodeName());
    }


    @Override
    public void start(StartContext context) throws StartException {
        if (!started.compareAndSet(false, true)) {
            throw new StartException("The service is still started!");
        }
        LOGGER.info("Start HASingleton timer service '" + this.getClass().getName() + "'");
       
        try {
            scheduler.initialize("HASingleton timer @" + this.env.getValue().getNodeName() + " " + new Date());
        } catch (Exception e) {
            throw new StartException("Could not initialize timer", e);
        }
    }


    @Override
    public void stop(StopContext context) {
        if (!started.compareAndSet(true, false)) {
            LOGGER.warn("The service '" + this.getClass().getName() + "' is not active!");
        } else {
            LOGGER.info("Stop HASingleton timer service '" + this.getClass().getName() + "'");
            try {
                scheduler.stop();
            } catch (Exception e) {
                LOGGER.error("Could not stop timer", e);
            }
        }
    }
}

@Singleton
@Local(Scheduler.class)
public class SchedulerBean implements Scheduler {
    private static Logger LOGGER = Logger.getLogger(SchedulerBean.class);
    @Resource
    private TimerService timerService;


    @Timeout
    public void scheduler(Timer timer) {
        LOGGER.info("HASingletonTimer: Info=" + timer.getInfo());
    }


    @Override
    public void initialize(String info) {
        ScheduleExpression sexpr = new ScheduleExpression();
        // set schedule to every 10 seconds for demonstration
        sexpr.hour("*").minute("*").second("0/10");
        // persistent must be false because the timer is started by the HASingleton service
        timerService.createCalendarTimer(sexpr, new TimerConfig(info, false));
    }


    @Override
    public void stop() {
        LOGGER.info("Stop all existing HASingleton timers");
        for (Timer timer : timerService.getTimers()) {
            LOGGER.trace("Stop HASingleton timer: " + timer.getInfo());
            timer.cancel();
        }
    }
}

So the only possibility to get bean in MSC service is to use InitialContext?

Ok, thanks for your help