Stop IronDoors from exploding

You forgot to replace the door in your loop.

 

Code (Text):

if (b.getType() == Material.IRON_DOOR) {
     if(blo.getType() == Material.OBSIDIAN) {

   it.remove();
    }

 

There is no code placing an iron door after it is destoryed. Remember editing the list won't do anything. You must place a new iron door at the location it exploded at.

 

You do not need to replace the door. Let me tell you a simple way to perform what you are doing.
Loop through all the destroyed blocks. Check if it contains a 1 block part of a iron door, if yes, check if there is a obsidian below it. If yes, remove the iron door from both y levels since a iron door has 2 parts from the blocklist not the iterator.

 

As i said, iron doors are in 2 parts. Try after removing the top portion, remove block below the block b from the list too.