Use getDeclaredConstructor(…) in RepositoryBeanDefinitionReader to avoid failures due to package-private constructors.

Closes #3325

Author: mp911de

src/main/java/org/springframework/data/repository/config/RepositoryBeanDefinitionReader.java

@@ -184,7 +184,8 @@ private RepositoryFragmentsContributor getFragmentsContributor(Class<?> reposito
 		Assert.state(beanDefinition.getBeanClassName() != null, "No Repository BeanFactory set");
 
 		Class<?> repositoryFactoryBean = forName(beanDefinition.getBeanClassName());
-		Constructor<?> constructor = ClassUtils.getConstructorIfAvailable(repositoryFactoryBean, Class.class);
+		Constructor<?> constructor = org.springframework.data.util.ClassUtils
+				.getDeclaredConstructorIfAvailable(repositoryFactoryBean, Class.class);
 
 		if (constructor == null) {
 			throw new IllegalStateException("No constructor accepting Class in " + repositoryFactoryBean.getName());

src/main/java/org/springframework/data/util/ClassUtils.java

@@ -15,10 +15,13 @@
  */
 package org.springframework.data.util;
 
+import java.lang.reflect.Constructor;
 import java.util.function.Consumer;
 
 import org.jspecify.annotations.Nullable;
 
+import org.springframework.util.Assert;
+
 /**
  * Utility class to work with classes.
  *
@@ -74,4 +77,27 @@ public static void ifPresent(String className, @Nullable ClassLoader classLoader
 		}
 	}
 
+	/**
+	 * Determine whether the given class has a public constructor with the given signature, and return it if available
+	 * (else return {@code null}).
+	 * <p>
+	 * Essentially translates {@code NoSuchMethodException} to {@code null}.
+	 *
+	 * @param clazz the clazz to analyze
+	 * @param paramTypes the parameter types of the method
+	 * @return the constructor, or {@code null} if not found
+	 * @see Class#getDeclaredConstructor
+	 * @since 4.0
+	 */
+	public static <T> @Nullable Constructor<T> getDeclaredConstructorIfAvailable(Class<T> clazz, Class<?>... paramTypes) {
+
+		Assert.notNull(clazz, "Class must not be null");
+
+		try {
+			return clazz.getDeclaredConstructor(paramTypes);
+		} catch (NoSuchMethodException ex) {
+			return null;
+		}
+	}
+
 }