[GR-57624] [24.2] NPE in Locale processing with JDK 24+10 and better

[jerboaa]

Describe the issue
A new JDK fix in JDK 24+10 causes NullPointerException when some Locale classes are being used in a native image.

Steps to reproduce the issue

1. Build Graal master (revision 152bcf2f6a4d1080b707258d4a5fdf27f51f4c69) with JDK 24+10 or better.
2. Generate a native image from the provided reproducer.
3. Run the reproducer.

Reproducer code

$ cat TestLocale.java 
import java.util.Locale;
public class TestLocale {
	public static void main(String[] args) {
		Locale some = Locale.of("de", "AT");
		System.out.println("Country: " + some.getDisplayCountry());
	}
}
$ $GRAALVM_HOME/bin/java  TestLocale.java
Country: Austria

Describe GraalVM and your environment:

• GraalVM master built from source
• JDK major version: 24+10
• OS: Linux
• Architecture: AMD64

More details
When running the produced native image one can observe an NPE:

$ ./loc-test
Exception in thread "main" java.lang.NullPointerException
	at java.base@24-beta/sun.util.locale.provider.LocaleResources.getLocaleName(LocaleResources.java:294)
	at java.base@24-beta/sun.util.locale.provider.LocaleNameProviderImpl.getDisplayString(LocaleNameProviderImpl.java:198)
	at java.base@24-beta/sun.util.locale.provider.LocaleNameProviderImpl.getDisplayCountry(LocaleNameProviderImpl.java:147)
	at java.base@24-beta/java.util.Locale$LocaleNameGetter.getObject(Locale.java:2652)
	at java.base@24-beta/java.util.Locale$LocaleNameGetter.getObject(Locale.java:2634)
	at java.base@24-beta/sun.util.locale.provider.LocaleServiceProviderPool.getLocalizedObjectImpl(LocaleServiceProviderPool.java:284)
	at java.base@24-beta/sun.util.locale.provider.LocaleServiceProviderPool.getLocalizedObject(LocaleServiceProviderPool.java:245)
	at java.base@24-beta/java.util.Locale.getDisplayString(Locale.java:2144)
	at java.base@24-beta/java.util.Locale.getDisplayCountry(Locale.java:2130)
	at java.base@24-beta/java.util.Locale.getDisplayCountry(Locale.java:2109)
	at TestLocale.main(TestLocale.java:5)
	at java.base@24-beta/java.lang.invoke.LambdaForm$DMH/sa346b79c.invokeStaticInit(LambdaForm$DMH)

Building GraalVM master on the same revision with JDK 24+9 works. We've determined that the issue is being caused by the JDK 24 fix new in build 10: https://bugs.openjdk.org/browse/JDK-8337603