NOTE: This a custom enchant module requires the latest 
TokenEnchantThis plugin contains a custom enchantment effect to neglects all TNT damage and knockback effects when being hit with TNT or exploded near you.
Installation:
Just install TE-FlakJacketEnchant.jar in TokenEnchant/enchants folder. Then you can either "restart the server" or "reload the plugin (not /te reload)". FlakJacketEnchantment will automatically be loaded into TokenEnchant framework.
Configuration:
Once you restart the server, FlakJacket_config.yml will be auto-generated in your enchants folder.  You can customize this file to suit your server's needs.  
FlakJacket:
  description: "Neglects all tnt damage and knockback effects when hit with tnt or exploded near you."
  event_map:
    EntityDamageEvent: "HIGHEST"
  price: 10
  max : 1
  occurrence: always