Fix GraalVM native image compatibility for AzureIdentityEnvVars #47940
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Replace reflection-dependent AzureIdentityEnvVars enum usage with direct string literal to avoid NullPointerException in GraalVM native images. The ExpandableStringEnum base class uses reflection for static field initialization, which doesn't work in native images without explicit configuration. Using the string literal 'AZURE_TOKEN_CREDENTIALS' directly eliminates the reflection dependency while maintaining identical runtime behavior. Fixes NullPointerException in IdentityClientOptions.loadFromConfiguration when running in GraalVM native builds (e.g., Quarkus applications).
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moved this to Untriaged
in Azure Identity SDK Improvements
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Replace reflection-dependent AzureIdentityEnvVars enum usage with direct string literal to avoid NullPointerException in GraalVM native images.
The ExpandableStringEnum base class uses reflection for static field initialization, which doesn't work in native images without explicit configuration. Using the string literal 'AZURE_TOKEN_CREDENTIALS' directly eliminates the reflection dependency while maintaining identical runtime behavior.
Fixes NullPointerException in IdentityClientOptions.loadFromConfiguration when running in GraalVM native builds (e.g., Quarkus applications).