Phone

[Shubzzz]

Samsung J8 

My front camera isn't open

Whenever I tried to open for front camera option it closes camera application.

[JishnudeepRoy]

Force Stop the Camera App from the Apps option of Settings and clear the cache. If the problem still continues backup your data and reset your device.

[babi07]

do it sir

[Klaus]

clear all the cache or force stop.. if its not working again visit nearby service center

[HBK515]

clear camera and gallery cache too

[SweenWolf]

Sometimes its just app, in that case, Clear cache and data of camera and gallery app, if that doesn't work try factory resetting it.

Or, you might have dropped your phone or any liquid damaged your camera (highly unlikely to happen but happened to me) and he sensors won't work, in that case go to Samsung Care Center and replace the Camera Sensors.

[AbhishekPuri]

You restart your phone after that you enjoy with your front camera