Amar3tto commented on code in PR #31618:
URL: https://github.com/apache/beam/pull/31618#discussion_r1643996264


##########
sdks/java/io/rabbitmq/src/main/java/org/apache/beam/sdk/io/rabbitmq/RabbitMqMessage.java:
##########
@@ -78,30 +80,37 @@ private static Map<String, Object> 
serializableHeaders(Map<String, Object> heade
     if (headers != null) {
       for (Map.Entry<String, Object> h : headers.entrySet()) {
         Object value = h.getValue();
-        if (!(value instanceof Serializable)) {
-          try {
-            if (value instanceof LongString) {
-              LongString longString = (LongString) value;
-              byte[] bytes = longString.getBytes();
-              String s = new String(bytes, StandardCharsets.UTF_8);
-              value = s;
-            } else {
-              throw new RuntimeException(String.format("no transformation 
defined for %s", value));
-            }
-          } catch (Throwable t) {
-            throw new UnsupportedOperationException(
-                String.format(
-                    "can't make unserializable value %s a serializable value 
(which is mandatory for Apache Beam dataflow implementation)",
-                    value),
-                t);
-          }
+        if (value instanceof List<?>) {

Review Comment:
   Added `RabbitMqMessageTest`



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