How to vibrate BlackBerry though code?(Java)

Here is what I'm trying to do ..

Whenever event occurs, device should vibrate for couple of seconds.

I tried to use Display.getDisplay(this).vibrate(2000);

It did not vib开发者_如何学JAVArate, while testing on device

Even tried it with device profile was set to Vibrate(Active)

Am I missing something here?

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Use Alert.isVibrateSupported(), Alert.startVibrate(time) and Alert.stopVibrate()