mjsax commented on code in PR #17005:
URL: https://github.com/apache/kafka/pull/17005#discussion_r1735367199


##########
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);
+        streamsConfig = new StreamsConfig(props);
+        assertEquals(DefaultProductionExceptionHandler.class, 
streamsConfig.productionExceptionHandler().getClass());
+    }
+
+    @SuppressWarnings("deprecation")
+    @Test
+    public void shouldUseNewProductionExceptionHandlerWhenBothConfigsAreSet() {
+        props.put(StreamsConfig.PRODUCTION_EXCEPTION_HANDLER_CLASS_CONFIG, 
DefaultProductionExceptionHandler.class);
+        
props.put(StreamsConfig.DEFAULT_PRODUCTION_EXCEPTION_HANDLER_CLASS_CONFIG, 
ProductionExceptionHandler.class);

Review Comment:
   Passing an interface does not seems to be right? For this case, the config 
is ignored as the new config is used, but otherwise, when we try to create an 
object we would crash.



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