Fix package tangles caused by ConfigurationProperties hints

Relocate `ConfigurationPropertiesReflectionHintsProcessor` and refactor
it to be a general purpose `BindableRuntimeHintsRegistrar`.

Prior to this commit, `ConfigurationPropertiesReflectionHintsProcessor`
was used to declare binding hints for classes that were bound, but
might be `@ConfigurationProperties`. By moving and renaming the class,
it's now better aligned to the way it's used.

Support for `@NestedConfigurationProperties` has been implemented by
adding a `@Nestable` meta-annotation. This allow us to create the
appropriate hints, without the `Binder` needing to be directly aware of
the `@NestedConfigurationProperties` annotation.

Closes gh-32815

Author: philwebb

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/freemarker/FreeMarkerRuntimeHints.java

@@ -16,22 +16,19 @@
 
 package org.springframework.boot.autoconfigure.freemarker;
 
-import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.RuntimeHintsRegistrar;
 import org.springframework.boot.autoconfigure.freemarker.FreeMarkerTemplateAvailabilityProvider.FreeMarkerTemplateAvailabilityProperties;
-import org.springframework.boot.context.properties.ConfigurationPropertiesReflectionHintsProcessor;
+import org.springframework.boot.context.properties.bind.BindableRuntimeHintsRegistrar;
 
 /**
  * {@link RuntimeHintsRegistrar} for FreeMarker support.
  *
  * @author Moritz Halbritter
  */
-class FreeMarkerRuntimeHints implements RuntimeHintsRegistrar {
+class FreeMarkerRuntimeHints extends BindableRuntimeHintsRegistrar {
 
-	@Override
-	public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
-		ConfigurationPropertiesReflectionHintsProcessor
-				.processConfigurationProperties(FreeMarkerTemplateAvailabilityProperties.class, hints.reflection());
+	FreeMarkerRuntimeHints() {
+		super(FreeMarkerTemplateAvailabilityProperties.class);
 	}
 
 }

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/http/HttpMessageConvertersAutoConfiguration.java

@@ -16,8 +16,6 @@
 
 package org.springframework.boot.autoconfigure.http;
 
-import org.springframework.aot.hint.RuntimeHints;
-import org.springframework.aot.hint.RuntimeHintsRegistrar;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
@@ -31,7 +29,7 @@
 import org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration.NotReactiveWebApplicationCondition;
 import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
 import org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration;
-import org.springframework.boot.context.properties.ConfigurationPropertiesReflectionHintsProcessor;
+import org.springframework.boot.context.properties.bind.BindableRuntimeHintsRegistrar;
 import org.springframework.boot.context.properties.bind.Binder;
 import org.springframework.boot.web.servlet.server.Encoding;
 import org.springframework.context.annotation.Bean;
@@ -102,12 +100,10 @@ private static class ReactiveWebApplication {
 
 	}
 
-	static class HttpMessageConvertersAutoConfigurationRuntimeHints implements RuntimeHintsRegistrar {
+	static class HttpMessageConvertersAutoConfigurationRuntimeHints extends BindableRuntimeHintsRegistrar {
 
-		@Override
-		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
-			ConfigurationPropertiesReflectionHintsProcessor.processConfigurationProperties(Encoding.class,
-					hints.reflection());
+		HttpMessageConvertersAutoConfigurationRuntimeHints() {
+			super(Encoding.class);
 		}
 
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/SpringApplication.java

@@ -36,8 +36,6 @@
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.aot.AotDetector;
-import org.springframework.aot.hint.RuntimeHints;
-import org.springframework.aot.hint.RuntimeHintsRegistrar;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
@@ -49,8 +47,8 @@
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
 import org.springframework.boot.Banner.Mode;
-import org.springframework.boot.context.properties.ConfigurationPropertiesReflectionHintsProcessor;
 import org.springframework.boot.context.properties.bind.Bindable;
+import org.springframework.boot.context.properties.bind.BindableRuntimeHintsRegistrar;
 import org.springframework.boot.context.properties.bind.Binder;
 import org.springframework.boot.context.properties.source.ConfigurationPropertySources;
 import org.springframework.boot.convert.ApplicationConversionService;
@@ -1428,12 +1426,10 @@ public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
 
 	}
 
-	static class SpringApplicationRuntimeHints implements RuntimeHintsRegistrar {
+	static class SpringApplicationRuntimeHints extends BindableRuntimeHintsRegistrar {
 
-		@Override
-		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
-			ConfigurationPropertiesReflectionHintsProcessor.processConfigurationProperties(SpringApplication.class,
-					hints.reflection());
+		SpringApplicationRuntimeHints() {
+			super(SpringApplication.class);
 		}
 
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/ConfigDataPropertiesRuntimeHints.java

@@ -19,7 +19,7 @@
 import org.springframework.aot.hint.ExecutableMode;
 import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.RuntimeHintsRegistrar;
-import org.springframework.boot.context.properties.ConfigurationPropertiesReflectionHintsProcessor;
+import org.springframework.boot.context.properties.bind.BindableRuntimeHintsRegistrar;
 import org.springframework.util.ReflectionUtils;
 
 /**
@@ -31,8 +31,7 @@ class ConfigDataPropertiesRuntimeHints implements RuntimeHintsRegistrar {
 
 	@Override
 	public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
-		ConfigurationPropertiesReflectionHintsProcessor.processConfigurationProperties(ConfigDataProperties.class,
-				hints.reflection());
+		BindableRuntimeHintsRegistrar.forTypes(ConfigDataProperties.class).registerHints(hints);
 		hints.reflection().registerMethod(ReflectionUtils.findMethod(ConfigDataLocation.class, "of", String.class),
 				ExecutableMode.INVOKE);
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConfigurationPropertiesBeanFactoryInitializationAotProcessor.java

@@ -24,6 +24,7 @@
 import org.springframework.beans.factory.aot.BeanFactoryInitializationAotProcessor;
 import org.springframework.beans.factory.aot.BeanFactoryInitializationCode;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.boot.context.properties.bind.BindableRuntimeHintsRegistrar;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.CollectionUtils;
 
@@ -66,10 +67,7 @@ private ConfigurationPropertiesReflectionHintsContribution(Iterable<Class<?>> ty
 		@Override
 		public void applyTo(GenerationContext generationContext,
 				BeanFactoryInitializationCode beanFactoryInitializationCode) {
-			for (Class<?> type : this.types) {
-				ConfigurationPropertiesReflectionHintsProcessor.processConfigurationProperties(type,
-						generationContext.getRuntimeHints().reflection());
-			}
+			BindableRuntimeHintsRegistrar.forTypes(this.types).registerHints(generationContext.getRuntimeHints());
 		}
 
 	}