How do I make the bootstrap dropdown menu work? I like to install in a bootstrap subtheme dropdown menu. But it does not work in my subtheme. Using the bootstrap theme it works.

my jolly.info.yml looks like this
    core: 8.x
    type: theme
    base theme: bootstrap

name: 'Jolly'
description: 'Theme for ...'
package: 'Bootstrap'

regions:
  navigation_collapsible: 'Navigation (Collapsible)'
  header: 'Top Bar'
  highlighted: 'Highlighted'
  search: 'Suchleiste'
  help: 'Help'
  content: 'Content'
  sidebar_first: 'Primary'

libraries:
  - 'jolly/global-styling'
  - 'jolly/bootstrap-scripts'


my jolly.libraries.yml looks like this

global-styling:
  css:
   theme:
     css/style.css: {}

bootstrap-scripts:
  js:
    bootstrap/js/affix.js: {}
    bootstrap/js/alert.js: {}
    bootstrap/js/button.js: {}
    bootstrap/js/carousel.js: {}
    bootstrap/js/collapse.js: {}
    bootstrap/js/dropdown.js: {}
    bootstrap/js/modal.js: {}
    bootstrap/js/tooltip.js: {}
    bootstrap/js/popover.js: {}
    bootstrap/js/scrollspy.js: {}
    bootstrap/js/tab.js: {}
    bootstrap/js/transition.js: {}

   dropdown:
    css:
      css/styles.css: {}
    js:
      js/dropdown.js: {}


and I use the same 


  menu--main.html.twig


like the bootstrap theme.

I try so many things but do not find what's wrong or what kind of dependency is necessary.

Can anybody help?
Add dependency in libraries.yml file just below the bootstrap js file:

dependencies:
    - core/jquery
    - core/drupal.ajax
    - core/drupal
    - core/drupalSettings
    - core/jquery.once