muralibasani commented on code in PR #17005:
URL: https://github.com/apache/kafka/pull/17005#discussion_r1735795478


##########
streams/src/test/java/org/apache/kafka/streams/StreamsConfigTest.java:
##########
@@ -1622,6 +1626,72 @@ public void testInvalidProcessingExceptionHandler() {
         );
     }
 
+    @Test
+    public void 
shouldSetAndGetDeserializationExceptionHandlerWhenOnlyNewConfigIsSet() {
+        
props.put(StreamsConfig.DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG, 
LogAndContinueExceptionHandler.class);
+        streamsConfig = new StreamsConfig(props);
+        assertEquals(LogAndContinueExceptionHandler.class, 
streamsConfig.deserializationExceptionHandler().getClass());
+    }
+
+    @SuppressWarnings("deprecation")
+    @Test
+    public void 
shouldUseNewDeserializationExceptionHandlerWhenBothConfigsAreSet() {
+        
props.put(StreamsConfig.DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG, 
LogAndContinueExceptionHandler.class);
+        
props.put(StreamsConfig.DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG, 
LogAndFailExceptionHandler.class);
+
+        try (LogCaptureAppender streamsConfigLogs = 
LogCaptureAppender.createAndRegister(StreamsConfig.class)) {
+            streamsConfigLogs.setClassLogger(StreamsConfig.class, Level.WARN);
+            streamsConfig = new StreamsConfig(props);
+            assertEquals(LogAndContinueExceptionHandler.class, 
streamsConfig.deserializationExceptionHandler().getClass());
+
+            final long warningMessageWhenBothConfigsAreSet = 
streamsConfigLogs.getMessages().stream()
+                .filter(m -> m.contains("Both the deprecated and new config 
for deserialization exception handler are configured."))
+                .count();
+            assertEquals(1, warningMessageWhenBothConfigsAreSet);
+        }
+    }
+
+    @SuppressWarnings("deprecation")
+    @Test
+    public void 
shouldUseOldDeserializationExceptionHandlerWhenOnlyOldConfigIsSet() {
+        
props.put(StreamsConfig.DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG, 
LogAndContinueExceptionHandler.class);
+        streamsConfig = new StreamsConfig(props);
+        assertEquals(LogAndContinueExceptionHandler.class, 
streamsConfig.deserializationExceptionHandler().getClass());
+    }
+
+    @Test
+    public void 
shouldSetAndGetProductionExceptionHandlerWhenOnlyNewConfigIsSet() {
+        props.put(StreamsConfig.PRODUCTION_EXCEPTION_HANDLER_CLASS_CONFIG, 
DefaultProductionExceptionHandler.class);

Review Comment:
   Thought about it, but missed. Now updated with 
ProductionExceptionHandlerMock, and also had to add a no args constructor.



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