zhangmeng0426 opened a new pull request #13468:
URL: https://github.com/apache/flink/pull/13468


   Properties extends Hashtable<Object,Object> ,The key and value of the 
Properties class support object objects. If the user's value is a boolean type, 
 this code "(String) k, (String) v"  will occur an error.
   
   such as :  java.lang.ClassCastException: java.lang.Boolean cannot be cast to 
java.lang.String
   
   


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