java.util.Hashset 中的 java.lang.ArrayStoreException
这是堆栈跟踪：
java.lang.ArrayStoreException
at java.util.HashMap.transfer(Unknown Source)
at java.util.HashMap.resize(Unknown Source)
at java.util.HashMap.addEntry(Unknown Source)
at java.util.HashMap.put(Unknown Source)
at java.util.HashSet.add(Unknown Source)
一些观察结果：
- 它是一个间歇性问题
- JDK 1.6
- CentOS 5.3
据我了解，此错误是间歇性的，我怀疑每当 HashSet（因此底层 HashMap）需要调整自身大小时就会发生它。但不确定为什么会出现此ArrayStoreException。现在我想知道的是
- 在什么情况下会发生此错误？
Here is the stack trace :
java.lang.ArrayStoreException
at java.util.HashMap.transfer(Unknown Source)
at java.util.HashMap.resize(Unknown Source)
at java.util.HashMap.addEntry(Unknown Source)
at java.util.HashMap.put(Unknown Source)
at java.util.HashSet.add(Unknown Source)
Some observations :
- Its an intermittent issue
- JDK 1.6
- CentOS 5.3
As I understand this error is intermittent I suspect it occurs whenever the HashSet (hence underlying HashMap) needs to resize itself. But not sure why this ArrayStoreException. Now what I want to know is
-What are the scenarios wherein this error can occur ?
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我的猜测是您正在尝试同时从多个线程更新该集合。
HashSet和HashMap并非设计为线程安全的 - 如果您要从多个线程访问您的集合，则应使用同步来防止并发访问。当然，这只是一个猜测 - 如果没有看到您的代码，我无法判断您是否正在使用多个线程。不过，它会伴随着事物间歇性的一面......
My guess is that you're trying to update the set from multiple threads concurrently.
HashSetandHashMaparen't designed to be thread-safe - if you're going to access your set from multiple threads, you should use synchronization to prevent concurrent access.That's just a guess, of course - without seeing your code I can't tell whether you are using multiple threads. It would go along with the intermittent side of things though...