Register Encoding on ReflectionHints for binding

Closes gh-31528

Author: mhalbritter

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

@@ -18,6 +18,8 @@
 
 import java.util.stream.Collectors;
 
+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;
@@ -27,15 +29,18 @@
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
 import org.springframework.boot.autoconfigure.condition.NoneNestedConditions;
 import org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration;
+import org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration.HttpMessageConvertersAutoConfigurationRuntimeHints;
 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.Binder;
 import org.springframework.boot.web.servlet.server.Encoding;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.core.env.Environment;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.http.converter.StringHttpMessageConverter;
@@ -60,6 +65,7 @@
 @Conditional(NotReactiveWebApplicationCondition.class)
 @Import({ JacksonHttpMessageConvertersConfiguration.class, GsonHttpMessageConvertersConfiguration.class,
 		JsonbHttpMessageConvertersConfiguration.class })
+@ImportRuntimeHints(HttpMessageConvertersAutoConfigurationRuntimeHints.class)
 public class HttpMessageConvertersAutoConfiguration {
 
 	static final String PREFERRED_MAPPER_PROPERTY = "spring.mvc.converters.preferred-json-mapper";
@@ -98,4 +104,14 @@ private static class ReactiveWebApplication {
 
 	}
 
+	static class HttpMessageConvertersAutoConfigurationRuntimeHints implements RuntimeHintsRegistrar {
+
+		@Override
+		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+			ConfigurationPropertiesReflectionHintsProcessor.processConfigurationProperties(Encoding.class,
+					hints.reflection());
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/http/HttpMessageConvertersAutoConfigurationTests.java

@@ -23,9 +23,13 @@
 import jakarta.json.bind.Jsonb;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration;
+import org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration.HttpMessageConvertersAutoConfigurationRuntimeHints;
 import org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration.MappingJackson2HttpMessageConverterConfiguration;
 import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
 import org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration;
@@ -36,6 +40,7 @@
 import org.springframework.boot.test.context.runner.ContextConsumer;
 import org.springframework.boot.test.context.runner.ReactiveWebApplicationContextRunner;
 import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
+import org.springframework.boot.web.servlet.server.Encoding;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.support.GenericApplicationContext;
@@ -61,6 +66,7 @@
  * @author Andy Wilkinson
  * @author Sebastien Deleuze
  * @author Eddú Meléndez
+ * @author Moritz Halbritter
  */
 class HttpMessageConvertersAutoConfigurationTests {
 
@@ -271,6 +277,15 @@ void whenAutoConfigurationIsActiveThenServerPropertiesConfigurationPropertiesAre
 				});
 	}
 
+	@Test
+	void shouldRegisterHints() {
+		RuntimeHints hints = new RuntimeHints();
+		new HttpMessageConvertersAutoConfigurationRuntimeHints().registerHints(hints, getClass().getClassLoader());
+		assertThat(RuntimeHintsPredicates.reflection().onType(Encoding.class)
+				.withMemberCategories(MemberCategory.INVOKE_DECLARED_METHODS, MemberCategory.INVOKE_PUBLIC_METHODS))
+						.accepts(hints);
+	}
+
 	private ApplicationContextRunner allOptionsRunner() {
 		return this.contextRunner.withConfiguration(AutoConfigurations.of(GsonAutoConfiguration.class,
 				JacksonAutoConfiguration.class, JsonbAutoConfiguration.class));