merlimat commented on a change in pull request #12106:
URL: https://github.com/apache/pulsar/pull/12106#discussion_r712622946



##########
File path: 
pulsar-client/src/main/java/org/apache/pulsar/client/impl/TypedMessageBuilderImpl.java
##########
@@ -284,7 +284,7 @@ public MessageMetadata getMetadataBuilder() {
 
     public Message<T> getMessage() {
         beforeSend();
-        return MessageImpl.create(msgMetadata, content, schema, 
producer.topic);
+        return MessageImpl.create(msgMetadata, content, schema, producer != 
null ? producer.getTopic() : null);

Review comment:
       In what case can we get that producer is null? 
   
   the field is defined as: 
   
   ```
       private transient final ProducerBase<?> producer;
   ```
   
   and we create the message builder starting from the producer. Would that 
mean that the message builder was serialized and passed around?




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