This test was trying to add windows to `ArrayList` instance from two different
threads without any synchronization.
So the reported test failure happens when the `WINDOWS` list contains only one
windows instead of expected two.
Another possible failure is:
Exception in thread "AWT-EventQueue-1"
java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 0
at java.base/java.util.ArrayList.add(ArrayList.java:455)
at java.base/java.util.ArrayList.add(ArrayList.java:467)
at
MultipleContextsFunctionalTest$1$1.run(MultipleContextsFunctionalTest.java:107)
at
java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
at
java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
at
java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at
java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
at
java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at
java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at
java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at
java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at
java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at
java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Total [200] - Expected [400]
Test FAILED
The test fails in about 8 out of 100 runs in a cycle for me.
Changing `ArrayList` to `CopyOnWriteArrayList` solves the issue. Didn't fail
once after modification and 300 runs.
-------------
Commit messages:
- initial
Changes: https://git.openjdk.org/jdk/pull/11423/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11423&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8271519
Stats: 5 lines in 1 file changed: 1 ins; 1 del; 3 mod
Patch: https://git.openjdk.org/jdk/pull/11423.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/11423/head:pull/11423
PR: https://git.openjdk.org/jdk/pull/11423
