java kenrnel reflecting for only admin not reflecting to students

[Rohithb8]

I have created a jupyterhub for students and install IJava kernel in shared directory. I can see the java kernel in my lab as an admin but users that is students cannot see java kernel when they logged in to their jupyterlab.
i have also modified config file:
c.Spawner.args = ['--NotebookApp.kernel_spec_manager_class=nb_conda_kernels.CondaKernelSpecManager']
#this will allow jupyter to use different kernels
c.Spawner.env_keep.append('/home/tele/.local/share/jupyter/kernels/java') # Add any required environment variables
c.KernelSpecManager.ensure_native_kernel = False
c.KernelSpecManager.kernel_cmd = ['/home/tele/.local/share/jupyter/kernels/java']

Path to IJava kernel

c.KernelSpecManager.whitelist = {'java','python'}
c.KernelSpecManager.kernel_dirs = ['/shared_kernel']
c.Authenticator.admin_users = {'tele'} # Specify admin users
c.Authenticator.whitelist = {'kumar_ex', 'user2'} # Add specific users
c.Authenticator.add_user_cmd = [
'adduser', '--force-badname', '-q', '--gecos', '', '--disabled-password'
]
c.Authenticator.check_password = lambda username, password: passwd('your_password') == 'aaf1577c327d4ff7edbee4b7e24762d523d6a1ef'