Cache ResponseBody annotation presence per controller class

Closes gh-36311

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestResponseBodyMethodProcessor.java

@@ -20,6 +20,8 @@ import java.io.IOException;
 import java.lang.reflect.Type;
 import java.net.URI;
 import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.jspecify.annotations.Nullable;
 
@@ -67,6 +69,9 @@ import org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolv
  */
 public class RequestResponseBodyMethodProcessor extends AbstractMessageConverterMethodProcessor {
 
+	private final Map<Class<?>, Boolean> responseBodyControllerCache = new ConcurrentHashMap<>();
+
+
 	/**
 	 * Basic constructor with converters only. Suitable for resolving
 	 * {@code @RequestBody}. For handling {@code @ResponseBody} consider also
@@ -132,7 +137,8 @@ public class RequestResponseBodyMethodProcessor extends AbstractMessageConverter
 
 	@Override
 	public boolean supportsReturnType(MethodParameter returnType) {
-		return (AnnotatedElementUtils.hasAnnotation(returnType.getContainingClass(), ResponseBody.class) ||
+		return (this.responseBodyControllerCache.computeIfAbsent(returnType.getContainingClass(),
+				clazz -> AnnotatedElementUtils.hasAnnotation(clazz, ResponseBody.class)) ||
 				returnType.hasMethodAnnotation(ResponseBody.class));
 	}