RFR: 8264990: Fix segfault when accessing local storage in webview

[Matthias Bläsing]

On Fri, 9 Apr 2021 19:10:13 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> I just tried it on Linux and get the same failure:
>> 
>> Caused by: java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because the return value of "java.lang.Class.getResource(String)" is null
>>         at mymod/myapp7.LocalStorageAccessWithModuleLayer.start(LocalStorageAccessWithModuleLayer.java:92)
>>         at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:849)
>>         at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:474)
>>         at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:447)
>>         at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
>>         at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:446)
>>         at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
>>         at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
>>         at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
>>         ... 1 more
>
> I get the same error. For some reason, the resource isn't found when it's on the root.
> Moving it inside the app7 package work.

Thank you both for checking. I noticed, there were two copies of the HTML present in the `build` folder, which explains the strange behavior.

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PR: https://git.openjdk.java.net/jfx/pull/458