On Thu, 16 Apr 2026 15:20:35 GMT, Lukasz Kostyra <[email protected]> wrote:
> `RenderLock1Test`'s instability comes from Windows focus stealing mechanism > getting in the way. > > The test displays an alert and relies on whether the alert's Button receives > focus while other window is rendering in the background. To successfully > receive focus on the test Button the application itself must be granted focus > first, which [in some cases can be rejected by the > OS](https://bugs.openjdk.org/browse/JDK-8351357). > > On macOS I noticed no issues - the test ran 100 times in a loop and succeeded > every time, no matter if Gradle ran with or without daemon. Similarly I ran > the test on our CI systems on repeat 100 times and it also succeeded there. > > On Linux the test does not work because when the alert-displaying Stage is > closed the "lost focus" event does not fire. This is a Linux specific issue > and it [already is documented in-code with an > assumption](https://github.com/openjdk/jfx/blob/master/tests/system/src/test/java/test/renderlock/RenderLockCommon.java#L111). > > On Windows the focus problems come from aforementioned focus stealing > prevention. The solution to this is similar to other tests that showed this > problem, which is to run tests using `--no-daemon` flag in Gradle. I > similarily tested this by running the test using `--no-daemon` flag on repeat > 100 times and the test always passed. > > I think we can mark this test as stable and include it into the testing pool. > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai). LGTM I ran the test 100 times in a loop and it passed every time. Since this is a simple test fix to enable a test, a single reviewer is sufficient. ------------- Marked as reviewed by kcr (Lead). PR Review: https://git.openjdk.org/jfx/pull/2151#pullrequestreview-4129451163
