Fix BindingReflectionHintsRegistrar anonymous classes support

This commit ensures that giving an anonymous class for reflection hints
registration does not result in a NullPointerException, since the
canonical name of anonymous classes is null.

Fixes gh-29657

spring-core/src/main/java/org/springframework/aot/hint/BindingReflectionHintsRegistrar.java

@@ -71,7 +71,7 @@ public class BindingReflectionHintsRegistrar {
 	}
 
 	private boolean shouldSkipMembers(Class<?> type) {
-		return type.getCanonicalName().startsWith("java.") || type.isArray();
+		return (type.getCanonicalName() != null && type.getCanonicalName().startsWith("java.")) || type.isArray();
 	}
 
 	private void registerReflectionHints(ReflectionHints hints, Set<Type> seen, Type type) {

spring-core/src/test/java/org/springframework/aot/hint/BindingReflectionHintsRegistrarTests.java

@@ -221,6 +221,12 @@ public class BindingReflectionHintsRegistrarTests {
 				});
 	}
 
+	@Test
+	void registerTypeForSerializationWithAnonymousClass() {
+		Runnable anonymousRunnable = () -> { };
+		bindingRegistrar.registerReflectionHints(this.hints.reflection(), anonymousRunnable.getClass());
+	}
+
 	@Test
 	void registerTypeForJacksonAnnotations() {
 		bindingRegistrar.registerReflectionHints(this.hints.reflection(), SampleClassWithJsonProperty.class);