Hi,
While running in hosted mode with GWT 1.6.4 I receive the following
error :
[ERROR] Uncaught exception escaped
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
at java.util.HashMap$ValueIterator.next(HashMap.java:822)
.......
I tracked down the "offending block" :
---- BEGIN CODE ----
Iterator<WidgetTask> taskIterator =
widgetTaskSet
.getAllTasks().iterator();
// Execute Each Task
while (taskIterator.hasNext()) {
WidgetTask dwt = taskIterator.next();
// Delete the task
widgetTaskSet.deleteTask(dwt);
// Execute the task goes here
}
---- END CODE ----
It seems that this block of code is executed somehow "in paralel" in
hosted mode so that while some "thread" iterates over the structure,
another one adds or deletes things from it. This behaviour is somewhat
natural in any event driven app (including my own).
I know that browsers are not multi-threaded, but the above scenario is
also possible in a browser because my application does asyncronuous
requests to the server.
Is there any way to syncronise the block/data structure so that this
doesn't happen anymore?
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