Yunyung commented on code in PR #20134:
URL: https://github.com/apache/kafka/pull/20134#discussion_r2195936947


##########
clients/src/main/java/org/apache/kafka/common/utils/Utils.java:
##########
@@ -1469,7 +1470,19 @@ public static <K, V> Map<K, V> filterMap(final Map<K, V> 
map, final Predicate<En
      * @return a map including all elements in properties
      */
     public static Map<String, Object> propsToMap(Properties properties) {
-        return castToStringObjectMap(properties);
+        try {
+            final Enumeration<?> enumeration = properties.propertyNames();
+            Map<String, Object> props = new HashMap<>();
+            while (enumeration.hasMoreElements()) {
+                Object key = enumeration.nextElement();
+                String keyString = (String) key;
+                Object value = (properties.get(keyString) != null) ? 
properties.get(keyString) : properties.getProperty(keyString);
+                props.put(keyString, value);
+            }
+            return props;
+        } catch (Exception e) {
+            throw new ConfigException("Key must be a string.");
+        }

Review Comment:
   In any case, let's also add the unit test for the exception thrown.



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