Following this tutorial to use Opencv Face Detection. At 4:00 he wrote on terminal: C:UserscvlabDesktopMyApplicationappsrcmain>javah -d jni -classpath ../../build/intermediate/classes/debug com.example.cvlab.myapplication.OpencvClass I’m trying to wrote the same path on my code but I’m running into this error: ‘javah’ is not recognized as an internal or external command Some of questions which the same already in stackoverflow , but it will not