Github user tony810430 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3651#discussion_r108864201
  
    --- Diff: 
flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/util/KinesisConfigUtil.java
 ---
    @@ -224,27 +222,19 @@ private static void 
validateOptionalPositiveDoubleProperty(Properties config, St
                }
        }
     
    -   private static void validateOptionalDateProperty(Properties config, 
String timestampKey, String formatKey, String message) {
    +   private static void validateOptionalDateProperty(Properties config, 
String timestampKey, String format, String message) {
                if (config.containsKey(timestampKey)) {
    -                   if (config.containsKey(formatKey)) {
    -                           try {
    -                                   SimpleDateFormat customDateFormat = new 
SimpleDateFormat(config.getProperty(formatKey));
    -                                   
customDateFormat.parse(config.getProperty(timestampKey));
    -                           } catch (ParseException | 
IllegalArgumentException | NullPointerException exception) {
    -                                   throw new 
IllegalArgumentException(message);
    -                           }
    -                   } else {
    +                   try {
    +                           SimpleDateFormat customDateFormat = new 
SimpleDateFormat(format);
    --- End diff --
    
    IllegalArgumentException would be thrown. See `SimpleDateFormat` 
[API](https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html#SimpleDateFormat(java.lang.String)).


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