[GitHub] [flink] hehuiyuan opened a new pull request #13566: [kafka connector]Fix cast question for properies() method in kafka ConnectorDescriptor

[GitBox]

hehuiyuan opened a new pull request #13566:
URL: https://github.com/apache/flink/pull/13566


   ## What is the purpose of the change
   
   This pull resquest fixes Kafka connector. There is a cast  problem when use 
properties method.
   
    ```
      Properties props = new Properties();
       props.put( "enable.auto.commit", "false");
       props.put( "fetch.max.wait.ms", "3000");
       props.put("flink.poll-timeout", 5000);
       props.put( "flink.partition-discovery.interval-millis", false);
   
      kafka = new Kafka()
           .version("0.11")
           .topic(topic)
           .properties(props);
   ```
   
   ```
   Exception in thread "main" java.lang.ClassCastException: java.lang.Integer 
cannot be cast to java.lang.String
   
   Exception in thread "main" java.lang.ClassCastException: java.lang.Boolean 
cannot be cast to java.lang.String
   ```
   
   ## Brief change log
   
     - *change  (String) v  ----> String.valueOf() in Kafka.java*
   
   
   
   
   ## Documentation
   
     - Does this pull request introduce a new feature? ( no)
   
   


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