View difference between Paste ID: gErZhfrr and tMUE43Kh

 import org.bukkit.configuration.serialization.ConfigurationSerialization;
 @SuppressWarnings("unchecked")
 	@Override
 	public void onEnable(){
 
 		File f = new File(this.getDataFolder() + "/database/" + "data.hashmap");
 		map = HashBiMap.create();
 		if(!f.exists()){
 			System.out.println("Hashmap not found, creating a new one");
 			map = HashBiMap.create();
 		}else{
 			try{
 				System.out.println("Hashmap found, loading...");
 				FileInputStream fileIn = new FileInputStream(this.getDataFolder() + "/database/" + "data.hashmap");
-				map = (HashBiMap<String, BlockVector>) in.readObject();
+
 
                 		Map<String, Object> inMap = in.readObject();
 				for (Map.Entry<String, Object> entry : inMap.entrySet()) {
 					BlockVector bvec = (BlockVector) ConfigurationSerialization.deserializeObject(entry.getValue());
 					map.put(entry.getKey(), bvec);
 				}
 				in.close();
 				fileIn.close();
 			}catch (Exception e){
 				e.printStackTrace();
 			}
 		}
 
 		getServer().getPluginManager().registerEvents(this, this);
 	}
 
 	@Override
 	public void onDisable(){
-			 out.writeObject(map);
+                Map<String, Object> outMap = new HashMap<String, Object>();
                 for (Map.Entry<String, BlockVector> entry : map.entrySet()) {
                         Map<String, Object> ser = entry.getValue().serialize();
                         ser.put(ConfigurationSerialization.SERIALIZED_TYPE_KEY, "BlockVector");
                         outMap.put(entry.getKey(), ser);
                 }
 		try{
 			 System.out.println("Saving hashmap...");
 			 FileOutputStream fileOut = new
 			 FileOutputStream(this.getDataFolder() + "/database/" +
 			 "data.hashmap");
 			 ObjectOutputStream out = new ObjectOutputStream(fileOut);
 			 out.writeObject(outMap);
 			 out.flush();
 			 out.close();
 			 fileOut.flush();
 			 fileOut.close();
 		}catch (Exception e){
 			e.printStackTrace();
 		}
 	}