Grails Roles init and check at startup

Grails Roles Init

// config
class BootStrap {
    def init = { servletContext ->
        def adminRole  = Role.findByAuthority('ROLE_ADMIN')?:   new Role(authority: 'ROLE_ADMIN').save(failOnError: true)
        def userRole   = Role.findByAuthority('ROLE_USER')?:    new Role(authority: 'ROLE_USER').save(failOnError: true)
        
        // admin user.
        def admin = User.findByUsername('admin@domain.com')?: new User(username: 'admin@domain.com',password: 'password', enabled: true).save(failOnError: true)
        UserRole.create admin, adminRole, true
        UserRole.create admin, userRole, true
        
        // simple user.
        def user = User.findByUsername('user@domain.com')?: new User(username: 'user@domain.com',password: 'password', enabled: true).save(failOnError: true)
        UserRole.create user, userRole, true
    }
    // ....
}