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

[Kevin Rushforth]

On Fri, 9 Apr 2021 15:51:05 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Can you tell me how you ran it? I ensured, that the test failed with a segfault before continuing with the fix. While I did that I indeed placed the file in the wrong directory, but currently I see no test failures locally. I run:
>> 
>> ./gradlew  -PFULL_TEST=true -PUSE_ROBOT=true :systemTests:cleanTest :systemTests:test --tests test.com.sun.webkit.LocalStorageAccessTest 
>> 
>> to only invoke the new test. I'll move the file to the package, but I'd like to understand where I went wrong.
>
> That's how I ran it, too. I did it from a clean repo. This was on Windows, but shouldn't matter.

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

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