Ran Tao
                                            Ran Tao
                                        
                                    @MartijnVisser thanks. i rebased it. ci passed. PTAL
@MartijnVisser I think we can fix it completely. i will fix this and update pr ASAP. Sorry for my mistake. thanks.

> hi. @MartijnVisser i have updated the pr. And i searched the source code didn't find any other occurs using `org.apache.commons.collections`. PTAL. thanks. hi. @MartijnVisser please take a look ?
@MartijnVisser thanks for explanations. make sense. we will be watching closely about kafka externalization.
@MartijnVisser hi, Martijn, https://issues.apache.org/jira/browse/FLINK-30859 has been resolved. Can you help me to check this pr?
Hi @MartijnVisser thanks. it seems like some recent code introduced a old usage. I updated it.   please check.
@MartijnVisser There is a circular reference. ci failed becase flink-python kafka test case failed. flink-python test case reference flink-sql-connector-kafka(not uber jar, without commons-collections class), so search it in flink and...