@schedule annotation produces "Cannot invoke timeout method because method null is not a timeout method" upon second and all consecutive executions

fails

@Singleton
@Startup
public class SettingsManagerImpl implements SettingsManager {
  ...
  @Schedule(hour = "*", minute = "*", second="13")
  public void checkSettingsProviders() {
    ...
  }
  ...
}

works

@Singleton
@Startup
public class SettingsManagerImpl implements SettingsManager {
  ...
  protected Timer timer;
  ...
  public void setup() {
     timer = timerService.createTimer(60*1000, 60*1000, null);
  }
  ...
  @Timeout
  public void checkSettingsProviders() {
    ...
  }
  ...
}