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http://issues.apache.org/bugzilla/show_bug.cgi?id=38986 ------- Additional Comments From [EMAIL PROTECTED] 2006-03-16 16:39 ------- ok last time :-) from the HashMap public Object get(Object key) { Object k = maskNull(key); int hash = hash(k); int i = indexFor(hash, table.length); Entry e = table[i]; while (true) { if (e == null) return e; if (e.hash == hash && eq(k, e.key)) return e.value; e = e.next; } } if the map has been modified during in the read process, it can happen that e.next points to e or something with something.next = e -> infinite loop. Please read the api contract: * <p><b>Note that this implementation is not synchronized.</b> If multiple * threads access this map concurrently, and at least one of the threads * modifies the map structurally, it <i>must</i> be synchronized externally. * (A structural modification is any operation that adds or deletes one or * more mappings; merely changing the value associated with a key that an * instance already contains is not a structural modification.) This is * typically accomplished by synchronizing on some object that naturally * encapsulates the map. If no such object exists, the map should be * "wrapped" using the <tt>Collections.synchronizedMap</tt> method. This is * best done at creation time, to prevent accidental unsynchronized access to * the map: <pre> Map m = Collections.synchronizedMap(new HashMap(...)); Please note that the ConcurrentModificationException is only used in the HashIterator, and even there it doesn't guarantee anything, but provides "best effort" attempt to detect a concurrent modification. -- Configure bugmail: http://issues.apache.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
