Finalizer exception when using NetworkImage.

[apwilson]

Test app:

void main() {
  runApp(new Row(children:[new NetworkImage(src:'https://i.ytimg.com/vi/tntOCGkgt98/maxresdefault.jpg')]));
}

Exception:

03-28 10:26:27.462 E/System  (17062): Uncaught exception thrown by finalizer
03-28 10:26:27.463 E/System  (17062): java.lang.IllegalStateException: Warning: Router objects should be explicitly closed when no longer required otherwise you may leak handles.
03-28 10:26:27.463 E/System  (17062):   at org.chromium.mojo.bindings.AutoCloseableRouter.finalize(AutoCloseableRouter.java:111)
03-28 10:26:27.463 E/System  (17062):   at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:202)
03-28 10:26:27.463 E/System  (17062):   at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:185)
03-28 10:26:27.463 E/System  (17062):   at java.lang.Thread.run(Thread.java:818)

[Hixie]

See also #2509 (comment) from @jamesr:

I remember looking with @collinjackson a few months back at a number of places in flutter that have mojo or android objects owned by dart or java objects without an explicit teardown path. In both cases this produces potentially pretty bad memory leaks as neither the Android runtime nor the Dart runtime promise to run finalizers promptly or even run them at all. I don't remember if anything came of this.

In this case the Mojo bindings Java finalizer is the one complaining that some Java object was holding on to a Mojo handle when the finalizer ran, meaning it wasn't explicitly destroyed.

[Hixie]

this sounds like the kind of thing @jason-simmons finds oddly irresistible. :-)

[Hixie]

We're probably leaking all the mojo objects on the Java side of things when accessibility is enabled, too.

[jimbeveridge]

+1 for this bug. Seeing it whenever I use FlutterView.

[github-actions]

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