galenwarren commented on a change in pull request #152:
URL: https://github.com/apache/flink-statefun/pull/152#discussion_r492357429



##########
File path: 
statefun-flink/statefun-flink-core/src/main/java/org/apache/flink/statefun/flink/core/StatefulFunctionsConfigValidator.java
##########
@@ -61,4 +64,26 @@ private static void 
validateParentFirstClassloaderPatterns(Configuration configu
     }
     return parentFirstClassloaderPatterns;
   }
+
+  private static void validateCustomPayloadSerializerClassName(Configuration 
configuration) {
+
+    MessageFactoryType factoryType =
+        configuration.get(StatefulFunctionsConfig.USER_MESSAGE_SERIALIZER);
+    String customPayloadSerializerClassName =
+        
configuration.get(StatefulFunctionsConfig.USER_MESSAGE_CUSTOM_PAYLOAD_SERIALIZER_CLASS);
+
+    if (factoryType == MessageFactoryType.WITH_CUSTOM_PAYLOADS) {
+      if 
(StringUtils.isNullOrWhitespaceOnly(customPayloadSerializerClassName)) {

Review comment:
       OK will do




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