Problem/Bug Fireworks no works in my plugin

This is my code , i have more features and that works fine but the firework no,which is the problem?
Sorry for my english not is my native language
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Code:

                      }
                      if (e.getPlayer().hasPermission("mdJoinfirework.true")) {
                          for (Player p : Bukkit.getOnlinePlayers()) {
                              Firework fw = (Firework) p.getWorld().spawnEntity(p.getLocation(), EntityType.FIREWORK);
                              FireworkMeta fwm = fw.getFireworkMeta();
                              Random r = new Random(); 
                              int rt = r.nextInt(4) + 1;
                              Type type = Type.BALL_LARGE;     
                              if (rt == 1) type = Type.BALL;
                              if (rt == 2) type = Type.BALL_LARGE;
                              if (rt == 3) type = Type.BURST;
                              if (rt == 4) type = Type.CREEPER;
                              if (rt == 5) type = Type.STAR;
                              int r1i = r.nextInt(17) + 1;
                              int r2i = r.nextInt(17) + 1;
                              Color c1 = getColor(r1i);
                              Color c7 = getColor(r2i);
                            
                              FireworkEffect effect = FireworkEffect.builder().flicker(r.nextBoolean()).withColor(c1).withFade(c7).with(type).trail(r.nextBoolean()).build();
                            
                              fwm.addEffect(effect);
                            
                              int rp = r.nextInt(2) + 1;
                              fwm.setPower(rp);
                            
                              fw.setFireworkMeta(fwm);
                              }
                          }
                      }
              }
          }
          }
        }
                          }
                          private Color getColor(int i) {
                              Color c = null;
                              if(i==1){
                              c=Color.AQUA;
                              }
                              if(i==2){
                              c=Color.BLACK;
                              }
                              if(i==3){
                              c=Color.BLUE;
                              }
                              if(i==4){
                              c=Color.FUCHSIA;
                              }
                              if(i==5){
                              c=Color.GRAY;
                              }
                              if(i==6){
                              c=Color.GREEN;
                              }
                              if(i==7){
                              c=Color.LIME;
                              }
                              if(i==8){
                              c=Color.MAROON;
                              }
                              if(i==9){
                              c=Color.NAVY;
                              }
                              if(i==10){
                              c=Color.OLIVE;
                              }
                              if(i==11){
                              c=Color.ORANGE;
                              }
                              if(i==12){
                              c=Color.PURPLE;
                              }
                              if(i==13){
                              c=Color.RED;
                              }
                              if(i==14){
                              c=Color.SILVER;
                              }
                              if(i==15){
                              c=Color.TEAL;
                              }
                              if(i==16){
                              c=Color.WHITE;
                              }
                              if(i==17){
                              c=Color.YELLOW;
                              }
                              
                              return c;
                              }