我遇到问题需要一段代码才能正常运行。我不完全确定这段代码是干什么的(我试图得到一个已经过时的插件,可以正常使用我们的服务器),我只知道它每运行20分钟就会抛出一个错误。这里有一个代码,其中的问题是发生的部分:}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());
}
误差从线42发生的,这就是:
itemStockMap.get(item.getInfo()).add(item.getStock());
它输出的错误,每20分钟发生两次2秒之间。
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)
在此先感谢您的帮助。
您是否重写了ItemInfo对象上的equals和hashcode,因为您正在对hashmap执行containsKey调用。 (itemStockMap.containsKey(item.getInfo())) – 2012-02-16 23:07:16