On Tue, 3 Mar 2020 22:51:43 GMT, Kevin Rushforth <k...@openjdk.org> wrote:
> While testing JavaFX using gradle 6.3-nightly and JDK 14, I ran into what
> turned out to be a latent test bug in the AppJSCallback* apps that are
> launched by ModuleLauncherTest. The launched apps construct a WebView
> instance, obtain a WebEngine instance from the WebView, add a state listener
> to the WebEngine, load the web content, and then return from the
> Application::start method. The WebView instance is held a local variable, and
> so is subject to garbage collection once it goes out of scope when the start
> method returns.
>
> In addition, the test apps did not check for successful launching of the
> application or successful loading of the web content, which led to the test
> suite hanging (else it would have been a simple test failure).
>
> Note that I don't know (nor care) what changed in JDK 14 to make this more
> likely to occur, but since the test itself is demonstrably wrong, it needs to
> be fixed.
>
> The main part of the fix was to make the WebEngine an instance variable. In
> order to make the test more robust, I also modified it to launch the
> application in another thread, and having the main thread check that the
> application launched successfully and that the web content was loaded
> successfully, after which I did the assertion check for the correct number of
> callbacks.
>
> The 5 different apps only differ from each other in the name of the class,
> the name of the package from which MyCallback is imported, and possibly the
> expected number of callbacks. I diffed AppJSCallbackExported.java against the
> other 4 test files and the diffs are essentially the same as they were before
> this change. Reviewers thus only need to review one of the tests in detail.
>
> For example, here are the diffs between AppJSCallbackExported and
> AppJSCallbackUnexported:
>
> $ diff .../AppJSCallbackExported.java .../AppJSCallbackUnexported.java
>
> 37c37
> < import myapp5.pkg2.MyCallback;
> ---
>> import myapp5.pkg1.MyCallback;
> 45c45
> < public class AppJSCallbackExported extends Application {
> ---
>> public class AppJSCallbackUnexported extends Application {
> 77c77
> < Util.assertEquals(1, callbackCount);
> ---
>> Util.assertEquals(0, callbackCount);
Please ignore this comment, this is for debugging Skara that might have some
mailing list mirroring issues 😄
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PR: https://git.openjdk.java.net/jfx/pull/134
