[Bug 264356] java/openjdk17: Exception with multi-screen setup

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264356

            Bug ID: 264356
           Summary: java/openjdk17:  Exception with multi-screen setup
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: java@FreeBSD.org
          Reporter: scf@FreeBSD.org
             Flags: maintainer-feedback?(java@FreeBSD.org)
          Assignee: java@FreeBSD.org
 Attachment #234335 text/plain
         mime type:

Created attachment 234335
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234335&action=edit
Fix for screen count

Starting in OpenJDK 17 (tested on FreeBSD), a call to
java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment() will cause a
program to throw java.lang.ExceptionInInitializerError if run on a
screen that is not the first screen, i.e., :3.0.

I am unsure how good the attached fix is, but it does prevent the crash.
Basically, the variable screens is null when run on another screen such
as :3.1.  As the only thing needed is the number of screens, I switched
it to use the already defined numScreens.

It is easy to duplicate using xephyr:
Xephyr :3 -screen 800x600 -screen 800x600

Running the attached java program on screen :3.0 will work.
Running it on screen :3.1 throws an exception:

Exception in thread "main" java.lang.ExceptionInInitializerError
        at
java.desktop/java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:106)
        at GraphEnv.main(GraphEnv.java:18)
Caused by: java.lang.NullPointerException: Cannot read the array length because
"this.screens" is null
        at
java.desktop/sun.awt.X11GraphicsEnvironment.initDevices(X11GraphicsEnvironment.java:235)
        at
java.desktop/sun.awt.X11GraphicsEnvironment.rebuildDevices(X11GraphicsEnvironment.java:216)
        at
java.desktop/sun.awt.X11GraphicsEnvironment.<init>(X11GraphicsEnvironment.java:201)
        at
java.desktop/sun.awt.PlatformGraphicsInfo.createGE(PlatformGraphicsInfo.java:36)
        at
java.desktop/java.awt.GraphicsEnvironment$LocalGE.createGE(GraphicsEnvironment.java:93)
        at
java.desktop/java.awt.GraphicsEnvironment$LocalGE.<clinit>(GraphicsEnvironment.java:84)
        at
java.desktop/java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:106)
        at GraphEnv.main(GraphEnv.java:18)
        at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at
jdk.compiler/com.sun.tools.javac.launcher.Main.execute(Main.java:419)
        at jdk.compiler/com.sun.tools.javac.launcher.Main.run(Main.java:192)
        at jdk.compiler/com.sun.tools.javac.launcher.Main.main(Main.java:132)

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