GH-751 Ensure RoutingFunction can be applied when function input type is AWS type

spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/config/JsonMessageConverter.java

@@ -91,6 +91,13 @@ public class JsonMessageConverter extends AbstractMessageConverter {
 				if (message.getPayload() instanceof byte[] && targetClass.isAssignableFrom(String.class)) {
 					return new String((byte[]) message.getPayload(), StandardCharsets.UTF_8);
 				}
+				else if (logger.isDebugEnabled()) {
+					Object payload = message.getPayload();
+					if (payload instanceof byte[]) {
+						payload = new String((byte[]) payload, StandardCharsets.UTF_8);
+					}
+					logger.warn("Failed to convert value: " + payload, e);
+				}
 			}
 		}
 

spring-cloud-function-context/src/main/java/org/springframework/cloud/function/json/JacksonMapper.java

@@ -19,6 +19,7 @@ package org.springframework.cloud.function.json;
 import java.io.Reader;
 import java.lang.reflect.Type;
 import java.util.Map;
+import java.util.function.Consumer;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JavaType;
@@ -42,6 +43,10 @@ public class JacksonMapper extends JsonMapper {
 		return this.fromJson(json, type);
 	}
 
+	public void configureObjectMapper(Consumer<ObjectMapper> configurer) {
+		configurer.accept(mapper);
+	}
+
 	@Override
 	protected <T> T doFromJson(Object json, Type type) {
 		T convertedValue = null;