GH-2528: Handle Conversion Exception with Batch

Resolves https://github.com/spring-projects/spring-amqp/issues/2528

Detect a conversion exception within a batch and reject just that message.

formatting code

Polishing.

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/listener/adapter/BatchMessagingMessageListenerAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019 the original author or authors.
+ * Copyright 2019-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,6 +25,7 @@ import org.springframework.amqp.rabbit.batch.SimpleBatchingStrategy;
 import org.springframework.amqp.rabbit.listener.api.ChannelAwareBatchMessageListener;
 import org.springframework.amqp.rabbit.listener.api.RabbitListenerErrorHandler;
 import org.springframework.amqp.rabbit.support.RabbitExceptionTranslator;
+import org.springframework.amqp.support.converter.MessageConversionException;
 import org.springframework.lang.Nullable;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.support.GenericMessage;
@@ -63,7 +64,20 @@ public class BatchMessagingMessageListenerAdapter extends MessagingMessageListen
 		else {
 			List<Message<?>> messagingMessages = new ArrayList<>();
 			for (org.springframework.amqp.core.Message message : messages) {
-				messagingMessages.add(toMessagingMessage(message));
+				try {
+					Message<?> messagingMessage = toMessagingMessage(message);
+					messagingMessages.add(messagingMessage);
+				}
+				catch (MessageConversionException e) {
+					this.logger.error("Could not convert incoming message", e);
+					try {
+						channel.basicReject(message.getMessageProperties().getDeliveryTag(), false);
+					}
+					catch (Exception ex) {
+						this.logger.error("Failed to reject message with conversion error", ex);
+						throw e; // NOSONAR
+					}
+				}
 			}
 			if (this.converterAdapter.isMessageList()) {
 				converted = new GenericMessage<>(messagingMessages);

spring-rabbit/src/test/java/org/springframework/amqp/rabbit/listener/adapter/BatchMessagingMessageListenerAdapterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,16 +21,42 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
 
 import java.lang.reflect.Method;
 import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
 
 import org.junit.jupiter.api.Test;
 
+import org.springframework.amqp.core.Message;
+import org.springframework.amqp.core.MessageBuilder;
+import org.springframework.amqp.core.MessagePropertiesBuilder;
+import org.springframework.amqp.rabbit.annotation.EnableRabbit;
+import org.springframework.amqp.rabbit.annotation.RabbitListener;
+import org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory;
+import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
+import org.springframework.amqp.rabbit.connection.ConnectionFactory;
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.amqp.rabbit.junit.RabbitAvailable;
+import org.springframework.amqp.rabbit.junit.RabbitAvailableCondition;
+import org.springframework.amqp.rabbit.listener.RabbitListenerContainerFactory;
+import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
+import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
 import org.springframework.amqp.utils.test.TestUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
 
 /**
  * @author Gary Russell
+ * @author heng zhang
+ *
  * @since 3.0
  *
  */
+@SpringJUnitConfig
+@RabbitAvailable(queues = "test.batchQueue")
 public class BatchMessagingMessageListenerAdapterTests {
 
 	@Test
@@ -52,4 +78,104 @@ public class BatchMessagingMessageListenerAdapterTests {
 	public void listen(List<String> in) {
 	}
 
+
+	@Test
+	public void errorMsgConvert(@Autowired BatchMessagingMessageListenerAdapterTests.Config config,
+						  @Autowired RabbitTemplate template) throws Exception {
+
+		Message message = MessageBuilder.withBody("""
+						{
+							"name" : "Tom",
+							"age" : 18
+						}
+						""".getBytes()).andProperties(
+						MessagePropertiesBuilder.newInstance()
+								.setContentType("application/json")
+								.setReplyTo("nowhere")
+								.build())
+				.build();
+
+		Message errorMessage = MessageBuilder.withBody("".getBytes()).andProperties(
+						MessagePropertiesBuilder.newInstance()
+								.setContentType("application/json")
+								.setReplyTo("nowhere")
+								.build())
+				.build();
+
+		for (int i = 0; i < config.count; i++) {
+			template.send("test.batchQueue", message);
+			template.send("test.batchQueue", errorMessage);
+		}
+
+		assertThat(config.countDownLatch.await(config.count * 1000L, TimeUnit.SECONDS)).isTrue();
+	}
+
+
+
+	@Configuration
+	@EnableRabbit
+	public static class Config {
+		volatile int count = 5;
+		volatile CountDownLatch countDownLatch = new CountDownLatch(count);
+
+		@RabbitListener(
+				queues = "test.batchQueue",
+				containerFactory = "batchListenerContainerFactory"
+		)
+		public void listen(List<Model> list) {
+			for (Model model : list) {
+				countDownLatch.countDown();
+			}
+
+		}
+
+		@Bean
+		ConnectionFactory cf() {
+			return new CachingConnectionFactory(RabbitAvailableCondition.getBrokerRunning().getConnectionFactory());
+		}
+
+		@Bean(name = "batchListenerContainerFactory")
+		public RabbitListenerContainerFactory<SimpleMessageListenerContainer> rc(ConnectionFactory connectionFactory) {
+			SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
+			factory.setConnectionFactory(connectionFactory);
+			factory.setPrefetchCount(1);
+			factory.setConcurrentConsumers(1);
+			factory.setBatchListener(true);
+			factory.setBatchSize(3);
+			factory.setConsumerBatchEnabled(true);
+
+			Jackson2JsonMessageConverter jackson2JsonMessageConverter = new Jackson2JsonMessageConverter(new ObjectMapper());
+			factory.setMessageConverter(jackson2JsonMessageConverter);
+
+			return factory;
+		}
+
+		@Bean
+		RabbitTemplate template(ConnectionFactory cf) {
+			return new RabbitTemplate(cf);
+		}
+
+
+	}
+	public static class Model {
+		String name;
+		String age;
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public String getAge() {
+			return age;
+		}
+
+		public void setAge(String age) {
+			this.age = age;
+		}
+	}
+
 }