Github user mharmer commented on the issue:
https://github.com/apache/ant/pull/81
I have a test case I wrote as well, however I was hesitant on adding it
since it dealt with non-deterministic behavior of trying to reproduce the race
condition. If it's desired I can add it, it's basically this:
```
/**
* This test ensures that when requesting Project.getCopyOfReferences a
* ConcurrentModificationException isn't thrown.
*
* ExecutorService is used so Exceptions are rethrown from their
executors
* and caught by JUnit as an error.
*/
@Test
public void testMultithreadedGetReferences() throws Exception {
final ExecutorService es1 = Executors.newSingleThreadExecutor();
final Future<?> getReferencesThread = es1.submit(() -> {
for (int i = 0; i < 1000; i++) {
p.getCopyOfReferences();
}
});
final ExecutorService es2 = Executors.newSingleThreadExecutor();
final Future<?> addReferencesThread = es2.submit(() -> {
for (int i = 0; i < 1000; i++) {
p.addReference("dummy" + i, "dummyValue");
}
});
getReferencesThread.get();
addReferencesThread.get();
}
```
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