Fix native support for generic array parameters

This commit adds a workaround for oracle/graal#6529
triggered by b374824.

When the GraalVM fix will have reached a wide enough
audience, it should be removed via spring-projectsgh-30394.

Closes spring-projectsgh-30407

spring-beans/src/main/java/org/springframework/beans/factory/aot/BeanRegistrationsAotContribution.java

@@ -16,6 +16,8 @@
 
 package org.springframework.beans.factory.aot;
 
+import java.lang.reflect.GenericArrayType;
+import java.lang.reflect.Type;
 import java.util.Map;
 
 import javax.lang.model.element.Modifier;
@@ -30,9 +32,11 @@
 import org.springframework.aot.hint.ReflectionHints;
 import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
+import org.springframework.core.ResolvableType;
 import org.springframework.javapoet.ClassName;
 import org.springframework.javapoet.CodeBlock;
 import org.springframework.javapoet.MethodSpec;
+import org.springframework.util.ReflectionUtils;
 
 /**
  * AOT contribution from a {@link BeanRegistrationsAotProcessor} used to
@@ -118,6 +122,17 @@ private void generateRegisterHints(RuntimeHints runtimeHints, Map<BeanRegistrati
 			if (beanClass.isRecord()) {
 				hints.registerType(beanClass, MemberCategory.INVOKE_DECLARED_METHODS);
 			}
+			// Workaround for https://github.com/oracle/graal/issues/6529
+			ReflectionUtils.doWithMethods(beanClass, method -> {
+				for (Type type : method.getGenericParameterTypes()) {
+					if (type instanceof GenericArrayType) {
+						Class<?> clazz = ResolvableType.forType(type).resolve();
+						if (clazz != null) {
+							hints.registerType(clazz);
+						}
+					}
+				}
+			});
 		});
 	}
 

spring-beans/src/test/java/org/springframework/beans/factory/aot/BeanRegistrationsAotContributionTests.java

@@ -36,6 +36,8 @@
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.support.RegisteredBean;
 import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.beans.testfixture.beans.GenericBeanWithBounds;
+import org.springframework.beans.testfixture.beans.Person;
 import org.springframework.beans.testfixture.beans.RecordBean;
 import org.springframework.beans.testfixture.beans.TestBean;
 import org.springframework.beans.testfixture.beans.factory.aot.MockBeanFactoryInitializationCode;
@@ -161,6 +163,16 @@ void applyToRegisterReflectionHintsOnRecordBean() {
 				.accepts(this.generationContext.getRuntimeHints());
 	}
 
+	@Test
+	void applyToRegisterReflectionHintsOnGenericBeanWithBounds() {
+		RegisteredBean registeredBean = registerBean(new RootBeanDefinition(GenericBeanWithBounds.class));
+		BeanDefinitionMethodGenerator generator = new BeanDefinitionMethodGenerator(this.methodGeneratorFactory,
+				registeredBean, null, List.of());
+		BeanRegistrationsAotContribution contribution = createContribution(GenericBeanWithBounds.class, generator);
+		contribution.applyTo(this.generationContext, this.beanFactoryInitializationCode);
+		assertThat(reflection().onType(Person[].class)).accepts(this.generationContext.getRuntimeHints());
+	}
+
 	private RegisteredBean registerBean(RootBeanDefinition rootBeanDefinition) {
 		String beanName = "testBean";
 		this.beanFactory.registerBeanDefinition(beanName, rootBeanDefinition);

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/GenericBeanWithBounds.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2002-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.beans.testfixture.beans;
+
+public class GenericBeanWithBounds<T extends Person> {
+
+	@SafeVarargs
+	public final void process(T... persons) {
+	}
+}