Add missing reflection hints on Jakarta types

This commit adds reflection hints for `jakarta.inject.Provider` and
ensures that hints are always contributed even if jakarta classes are
not on the classpath.

Fixes gh-31259

Author: bclozel

spring-beans/src/main/java/org/springframework/beans/factory/annotation/JakartaAnnotationsRuntimeHints.java

@@ -20,23 +20,20 @@
 
 import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.TypeReference;
 import org.springframework.lang.Nullable;
-import org.springframework.util.ClassUtils;
 
 /**
  * {@link RuntimeHintsRegistrar} for Jakarta annotations.
- * <p>Hints are only registered if Jakarta inject is on the classpath.
  *
  * @author Brian Clozel
  */
 class JakartaAnnotationsRuntimeHints implements RuntimeHintsRegistrar {
 
 	@Override
 	public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
-		if (ClassUtils.isPresent("jakarta.inject.Inject", classLoader)) {
-			Stream.of("jakarta.inject.Inject", "jakarta.inject.Qualifier").forEach(annotationType ->
-					hints.reflection().registerType(ClassUtils.resolveClassName(annotationType, classLoader)));
-		}
+		Stream.of("jakarta.inject.Inject", "jakarta.inject.Provider", "jakarta.inject.Qualifier").forEach(typeName ->
+				hints.reflection().registerType(TypeReference.of(typeName)));
 	}
 
 }

spring-beans/src/test/java/org/springframework/beans/factory/annotation/JakartaAnnotationsRuntimeHintsTests.java

@@ -18,6 +18,7 @@
 
 
 import jakarta.inject.Inject;
+import jakarta.inject.Provider;
 import jakarta.inject.Qualifier;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -51,6 +52,11 @@ void jakartaInjectAnnotationHasHints() {
 		assertThat(RuntimeHintsPredicates.reflection().onType(Inject.class)).accepts(this.hints);
 	}
 
+	@Test
+	void jakartaProviderAnnotationHasHints() {
+		assertThat(RuntimeHintsPredicates.reflection().onType(Provider.class)).accepts(this.hints);
+	}
+
 	@Test
 	void jakartaQualifierAnnotationHasHints() {
 		assertThat(RuntimeHintsPredicates.reflection().onType(Qualifier.class)).accepts(this.hints);