Plugin Development - HashMaps and double problems?

Hello, bukkit plugin developers. I've been working on a plugin recently, and while I seem to have conquered one of my old problems, I just ran into two more. They involve HashMaps, and a weird problem I'm getting from a double.


So firstly, the double. I wanted to lower the probability of something happening accordingly to what you're wearing, so to generate this probability multiplier, I created this method:

Code:

public double getHeadShotProb(Player p) {
        int hat = p.getInventory().getHelmet().getTypeId();
        
        switch (hat) {
        case 298: return 1.25;
        case 302: return 1.5;
        case 306: return 1.75;
        case 310: return 2;
        default: return 1;
        }
    }

I've used it in multiple different situations, and even when I just call it up alone, it always gives the same problem- Could not pass event <event>. It was ENTITY_DAMAGE in most cases, but that's irrelevant, it didn't work either way.

So if you know what's wrong here, tell me.




Next is with hashmaps.
I've created a simple hashmap, HashMap<Player, Boolean> isImpaired. No errors came up in eclipse, but then when I tried

Code:

plugin.isImpaired.put(player, true);

it gave me the same error as the other one- Could not pass even <event>.

So, what am I doing wrong? Thanks ahead of time!




~Isaac