After composer update, the artisan has not been worked.
the composer.json is:
{ "require": { "tymon/jwt-auth": "0.5.*" } }
just happend fatal error exception:

PHP Fatal error: Uncaught exception 'ReflectionException' with message 'Class App\Console\Kernel does not exist' in /var/www/xxx.com/vendor/laravel/framework/src/Illuminate/Container/Container.php:737
Stack trace:

0 /var/www/xxx.com/vendor/laravel/framework/src/Illuminate/Container/Container.php(737): ReflectionClass->__construct('App\Console\Ker...')

1 /var/www/xxx.com/vendor/laravel/framework/src/Illuminate/Container/Container.php(627): Illuminate\Container\Container->build('App\Console\Ker...', Array)

2 /var/www/xxx.com/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(674): Illuminate\Container\Container->make('App\Console\Ker...', Array)

3 /var/www/xxx.com/vendor/laravel/framework/src/Illuminate/Container/Container.php(216): Illuminate\Foundation\Application->make('App\Console\Ker...', Array)

4 /var/www/xxx.com/vendor/laravel/framework/src/Illuminate/Container/Container.php(734): Illuminate\Container\Container->Illuminate\Container{closure}(Object(Illuminate\Foundation\Appli in /var/www/xxx.com/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 737

And the bootstrap/autoload.php is OK.
I want kown what happend here, and I what I should do to refresh artisan cmd.