GH-1631: fix missing @sendto for cglib proxies

Resolves #1631

GH-1631: add test

Fix imports.

spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/DelegatingInvocableHandler.java

@@ -180,8 +180,9 @@ private void setupReplyTo(InvocableHandlerMethod handler) {
 			replyTo = extractSendTo(method.toString(), ann);
 		}
 		if (ann == null) {
-			ann = AnnotationUtils.getAnnotation(this.bean.getClass(), SendTo.class);
-			replyTo = extractSendTo(this.getBean().getClass().getSimpleName(), ann);
+			Class<?> beanType = handler.getBeanType();
+			ann = AnnotationUtils.getAnnotation(beanType, SendTo.class);
+			replyTo = extractSendTo(beanType.getSimpleName(), ann);
 		}
 		if (ann != null && replyTo == null) {
 			replyTo = AdapterUtils.getDefaultReplyTopicExpression();

spring-kafka/src/test/java/org/springframework/kafka/annotation/EnableKafkaIntegrationTests.java

@@ -47,6 +47,10 @@
 import javax.validation.ValidationException;
 import javax.validation.constraints.Max;
 
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.apache.kafka.clients.admin.NewTopic;
 import org.apache.kafka.clients.consumer.Consumer;
 import org.apache.kafka.clients.consumer.ConsumerConfig;
@@ -62,13 +66,20 @@
 import org.junit.jupiter.api.Test;
 import org.mockito.Mockito;
 
+import org.springframework.aop.framework.ProxyFactory;
+import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
+import org.springframework.context.annotation.Role;
 import org.springframework.context.event.EventListener;
 import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.data.web.JsonPath;
 import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
@@ -161,6 +172,8 @@
 		"annotated38", "annotated38reply" })
 public class EnableKafkaIntegrationTests {
 
+	private static final Log logger = LogFactory.getLog(EnableKafkaIntegrationTests.class);
+
 	private static final String DEFAULT_TEST_GROUP_ID = "testAnnot";
 
 	@Autowired
@@ -1207,6 +1220,13 @@ public IfaceListener<String> ifaceListener() {
 			return new IfaceListenerImpl();
 		}
 
+		@Bean
+		@Order(Ordered.HIGHEST_PRECEDENCE)
+		@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
+		public ProxyListenerPostProcessor proxyListenerPostProcessor() {
+			return new ProxyListenerPostProcessor();
+		}
+
 		@Bean
 		public MultiListenerBean multiListener() {
 			return new MultiListenerBean();
@@ -1883,6 +1903,27 @@ public void registerSeekCallback(ConsumerSeekCallback callback) {
 
 	}
 
+	static class ProxyListenerPostProcessor implements BeanPostProcessor {
+
+		@Override
+		public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
+			if ("multiListenerSendTo".equals(beanName)) {
+				ProxyFactory proxyFactory = new ProxyFactory(bean);
+				proxyFactory.setProxyTargetClass(true);
+				proxyFactory.addAdvice(new MethodInterceptor() {
+					@Override
+					public Object invoke(MethodInvocation invocation) throws Throwable {
+						logger.info(String.format("Proxy listener for %s.$s",
+								invocation.getMethod().getDeclaringClass(), invocation.getMethod().getName()));
+						return invocation.proceed();
+					}
+				});
+				return proxyFactory.getProxy();
+			}
+			return bean;
+		}
+	}
+
 	public static class SeekToLastOnIdleListener extends AbstractConsumerSeekAware {
 
 		private final CountDownLatch latch1 = new CountDownLatch(10);