Don't Log Converted Message With Projection

`toString()` cannot be invoked on the payload proxy created by
the project factory.

Author: garyrussell

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

@@ -25,6 +25,7 @@
 import org.springframework.kafka.listener.KafkaListenerErrorHandler;
 import org.springframework.kafka.listener.ListenerExecutionFailedException;
 import org.springframework.kafka.support.Acknowledgment;
+import org.springframework.kafka.support.converter.ProjectingMessageConverter;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.support.GenericMessage;
 
@@ -79,7 +80,7 @@ public void onMessage(ConsumerRecord<K, V> record, Acknowledgment acknowledgment
 		else {
 			message = NULL_MESSAGE;
 		}
-		if (logger.isDebugEnabled()) {
+		if (logger.isDebugEnabled() && !(getMessageConverter() instanceof ProjectingMessageConverter)) {
 			logger.debug("Processing [" + message + "]");
 		}
 		try {