我遇到問題需要一段代碼才能正常運行。我不完全確定這段代碼是幹什麼的(我試圖得到一個已經過時的插件,可以正常使用我們的服務器),我只知道它每運行20分鐘就會拋出一個錯誤。這裏有一個代碼,其中的問題是發生的部分:}UnsupportedOperationException java.util.AbstractList.add
public class DynamicThread extends Thread {
private LocalShops plugin = null;
public DynamicThread(ThreadGroup tgroup, String tname, LocalShops plugin) {
super(tgroup, tname);
this.plugin = plugin;
}
public void run() {
Map<ItemInfo, List<Integer>> itemStockMap = Collections.synchronizedMap(new HashMap<ItemInfo, List<Integer>>());
//Dump all the shop stock data into the map.
for (Shop shop : plugin.getShopManager().getAllShops()) {
for (InventoryItem item : shop.getItems()) {
if (itemStockMap.containsKey(item.getInfo()))
itemStockMap.get(item.getInfo()).add(item.getStock()); //Where error happens
else
itemStockMap.put(item.getInfo(), Arrays.asList(item.getStock()));
}
}
for(ItemInfo item : itemStockMap.keySet()) {
List<Integer> stockList = GenericFunctions.limitOutliers(itemStockMap.get(item));
//remove the map before re-adding it
if (DynamicManager.getPriceAdjMap().containsKey(item))
DynamicManager.getPriceAdjMap().remove(item);
//Get the overall stock change for a given item and then calculate the adjustment given the volatility
int deltaStock = GenericFunctions.getSum(stockList) - Config.getGlobalBaseStock();
DynamicManager.getPriceAdjMap().put(item, GenericFunctions.getAdjustment(Config.getGlobalVolatility(), deltaStock));
}
Bukkit.getServer().getScheduler().callSyncMethod(plugin, plugin.getShopManager().updateSigns());
}
誤差從線42發生的,這就是:
itemStockMap.get(item.getInfo()).add(item.getStock());
它輸出的錯誤,每20分鐘發生兩次2秒之間。
2012-02-16 16:53:25 [INFO] Launch Dynamic Thread
2012-02-16 16:53:25 [SEVERE] Exception in thread "dynamic"
2012-02-16 16:53:25 [SEVERE] java.lang.UnsupportedOperationException
2012-02-16 16:53:25 [SEVERE] at java.util.AbstractList.add(AbstractList.java:131)
2012-02-16 16:53:25 [SEVERE] at java.util.AbstractList.add(AbstractList.java:91)
2012-02-16 16:53:25 [SEVERE] at com.milkbukkit.localshops.threads.DynamicThread.run(DynamicThread.java:42)
2012-02-16 16:53:27 [INFO] Launch Dynamic Thread
2012-02-16 16:53:27 [SEVERE] Exception in thread "dynamic"
2012-02-16 16:53:27 [SEVERE] java.lang.UnsupportedOperationException
2012-02-16 16:53:27 [SEVERE] at java.util.AbstractList.add(AbstractList.java:131)
2012-02-16 16:53:27 [SEVERE] at java.util.AbstractList.add(AbstractList.java:91)
2012-02-16 16:53:27 [SEVERE] at com.milkbukkit.localshops.threads.DynamicThread.run(DynamicThread.java:42)
在此先感謝您的幫助。
您是否重寫了ItemInfo對象上的equals和hashcode,因爲您正在對hashmap執行containsKey調用。 (itemStockMap.containsKey(item.getInfo())) – 2012-02-16 23:07:16