shibd commented on code in PR #16740:
URL: https://github.com/apache/pulsar/pull/16740#discussion_r931691027


##########
pulsar-functions/instance/src/main/java/org/apache/pulsar/functions/instance/JavaInstanceRunnable.java:
##########
@@ -384,7 +386,12 @@ private void sendOutputMessage(Record srcRecord, Object 
output) throws Exception
         try {
             this.sink.write(sinkRecord);
         } catch (Exception e) {
-            log.info("Encountered exception in sink write: ", e);
+            if (e instanceof ClassCastException && functionClassLoader != 
componentClassLoader) {

Review Comment:
   Oh, sorry. I miss this.
   
   However, if the user wants to use it, the input parameter type may need to 
be carefully defined. In general, users can only use `GenericObject`, which 
triggers the registration of `auto_consumer` type schema, because only then can 
multiple topic inputs be processed.
   
   Am I right?
   
   



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