Explosion resistance

Hi. I am pretty new to coding plugins to Minecraft. I just want to make Ender Dragon resistant to explosions. I've made something like this, but something doesn't work.

Code:

if(event.getEntityType() == EntityType.ENDER_DRAGON) {
            EnderDragon ed = (EnderDragon) event.getEntity();
         
            EntityDamageEvent e = ed.getLastDamageCause();
         
            if(e == DamageCause.BLOCK_EXPLOSION) {
                e.setDamage(0);
            }
         
            Player player = ed.getKiller();
         
            player.sendMessage("Brawo " + player + ", zabiłeś smoka");
        }

"e == DamageCause.BLOCK_EXPLOSION" is underscored and it doesn't work. How can I fix this?

Nevermind, I just found out how to do this

It went like that:

Code:

if(event.getEntityType() == EntityType.ENDER_DRAGON) {
            EnderDragon ed = (EnderDragon) event.getEntity();
           
            EntityDamageEvent e = ed.getLastDamageCause();
           
            if(e.getCause() == DamageCause.BLOCK_EXPLOSION) {
                e.setDamage(0);
            }
           
            Player player = ed.getKiller();
           
            player.sendMessage("Brawo " + player + ", zabiłeś smoka");
        }

EDIT by Moderator: merged posts, please use the edit button instead of double posting.