B4J Question Raspberry and Servo motor

Have you tried to use SoftPwm: http://pi4j.com/apidocs/com/pi4j/wiringpi/SoftPwm.html ?

Here's an example with PWM: http://razzpisampler.oreilly.com/ch05.html

Thank you all, but this code uses a "virtual" pwm that isn't accurate and uses too cpu. I need to control two servo of a webcam so i need a stable solution! I've read that the Raspi has one or more hardware pwm https://www.raspberrypi.org/forums/viewtopic.php?f=91&t=105044. There is a way to use it?

For servo controlling i use always the micro maestro servo controller from Pololu. I use it for camera control too for years without problems (but mid-size video cams no webcams), driving is stable and smooth (winch servos with 10 turns and 10:1 gear ratio).
The benefits:
Controlling is simple with serial interface from Arduino or Pi.
I can use it with PC also without the need of an microcontroller.
The servo controller can use ramping.

for servo control I use a pca9685
it is a i2c controled 12 chanel pwm controler
from adafruit you can buy a servo hat.