Update SpringBootJoranConfigurator to use proper GraalVM format for inner class

Prior to this commit, the generated name for inner class had a wrong
format <package>.<parent>.<child> (canonical name). GraalVM expects $
to  separate the parent from the inner class.

This commit updates SpringBootJoranConfigurator to generate an
appropriate format for a class name. Specifically, an
inner class should be separated by a dollar sign, not a dot.

See spring-projectsgh-44016

Signed-off-by: Dmytro Nosan <[email protected]>

Author: nosan

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/SpringBootJoranConfigurator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -231,12 +231,12 @@ private Set<Class<? extends Serializable>> serializationTypes(Model model) {
 			return modelClasses;
 		}
 
-		private Set<String> reflectionTypes(Model model) {
+		private Set<Class<?>> reflectionTypes(Model model) {
 			return reflectionTypes(model, () -> null);
 		}
 
-		private Set<String> reflectionTypes(Model model, Supplier<Object> parent) {
-			Set<String> reflectionTypes = new HashSet<>();
+		private Set<Class<?>> reflectionTypes(Model model, Supplier<Object> parent) {
+			Set<Class<?>> reflectionTypes = new HashSet<>();
 			Class<?> componentType = determineType(model, parent);
 			if (componentType != null) {
 				processComponent(componentType, reflectionTypes);
@@ -306,23 +306,22 @@ private Object instantiate(Class<?> type) {
 			}
 		}
 
-		private void processComponent(Class<?> componentType, Set<String> reflectionTypes) {
+		private void processComponent(Class<?> componentType, Set<Class<?>> reflectionTypes) {
 			BeanDescription beanDescription = this.modelInterpretationContext.getBeanDescriptionCache()
 				.getBeanDescription(componentType);
 			reflectionTypes.addAll(parameterTypesNames(beanDescription.getPropertyNameToAdder().values()));
 			reflectionTypes.addAll(parameterTypesNames(beanDescription.getPropertyNameToSetter().values()));
-			reflectionTypes.add(componentType.getCanonicalName());
+			reflectionTypes.add(componentType);
 		}
 
-		private Collection<String> parameterTypesNames(Collection<Method> methods) {
+		private Collection<Class<?>> parameterTypesNames(Collection<Method> methods) {
 			return methods.stream()
 				.filter((method) -> !method.getDeclaringClass().equals(ContextAware.class)
 						&& !method.getDeclaringClass().equals(ContextAwareBase.class))
 				.map(Method::getParameterTypes)
 				.flatMap(Stream::of)
 				.filter((type) -> !type.isPrimitive() && !type.equals(String.class))
 				.map((type) -> type.isArray() ? type.getComponentType() : type)
-				.map(Class::getName)
 				.toList();
 		}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackConfigurationAotContributionTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -23,6 +23,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Properties;
 import java.util.function.Consumer;
 import java.util.function.Predicate;
@@ -54,6 +55,7 @@
 import org.springframework.aot.hint.MemberCategory;
 import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.SerializationHints;
+import org.springframework.aot.hint.TypeHint;
 import org.springframework.aot.hint.TypeReference;
 import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
 import org.springframework.aot.test.generate.TestGenerationContext;
@@ -214,6 +216,14 @@ void typeFromParentsDefaultClassAnnotatedSetterIsRegisteredForReflection() {
 			.accepts(generationContext.getRuntimeHints());
 		assertThat(invokePublicConstructorsAndInspectAndInvokePublicMethodsOf(Implementation.class))
 			.accepts(generationContext.getRuntimeHints());
+		assertThat(invokePublicConstructorsAndInspectAndInvokePublicMethodsOf(BaseImplementation.Details.class))
+			.accepts(generationContext.getRuntimeHints());
+
+		assertThat(hasValidNestedTypeName(OuterWithDefaultClass.class)).accepts(generationContext.getRuntimeHints());
+		assertThat(hasValidNestedTypeName(Implementation.class)).accepts(generationContext.getRuntimeHints());
+		assertThat(hasValidNestedTypeName(BaseImplementation.Details.class))
+			.accepts(generationContext.getRuntimeHints());
+
 	}
 
 	@Test
@@ -250,6 +260,16 @@ private Predicate<RuntimeHints> invokePublicConstructorsAndInspectAndInvokePubli
 					MemberCategory.INVOKE_PUBLIC_METHODS);
 	}
 
+	private Predicate<RuntimeHints> hasValidNestedTypeName(Class<?> type) {
+		return (runtimeHints) -> {
+			String name = Optional.ofNullable(runtimeHints.reflection().getTypeHint(type))
+				.map(TypeHint::getType)
+				.map(TypeReference::getName)
+				.orElse("");
+			return name.equals(type.getEnclosingClass().getName() + "$" + type.getSimpleName());
+		};
+	}
+
 	private Properties load(InputStreamSource source) {
 		try (InputStream inputStream = source.getInputStream()) {
 			Properties properties = new Properties();
@@ -323,7 +343,21 @@ public void setContract(Contract contract) {
 
 	}
 
-	public static class Implementation implements Contract {
+	public static class BaseImplementation implements Contract {
+
+		private Details details;
+
+		public void setDetails(Details details) {
+			this.details = details;
+		}
+
+		public static final class Details {
+
+		}
+
+	}
+
+	public static class Implementation extends BaseImplementation {
 
 	}