[ 
https://issues.apache.org/jira/browse/FLINK-3635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Ted Yu updated FLINK-3635:
--------------------------
    Description: 
{code}
      JsonNode jsonNode = jsonParser.readValue(value, JsonNode.class);
      if (jsonNode.has("user") && 
jsonNode.get("user").get("lang").asText().equals("en")) {
{code}

jsonNode.get("user").get("lang") may return null, leading to 
NullPointerException.

  was:
{code}
      JsonNode jsonNode = jsonParser.readValue(value, JsonNode.class);
      if (jsonNode.has("user") && 
jsonNode.get("user").get("lang").asText().equals("en")) {
{code}
jsonNode.get("user").get("lang") may return null, leading to 
NullPointerException.


> Potential null deference in 
> TwitterExample#SelectEnglishAndTokenizeFlatMap#flatMap
> ----------------------------------------------------------------------------------
>
>                 Key: FLINK-3635
>                 URL: https://issues.apache.org/jira/browse/FLINK-3635
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Priority: Minor
>
> {code}
>       JsonNode jsonNode = jsonParser.readValue(value, JsonNode.class);
>       if (jsonNode.has("user") && 
> jsonNode.get("user").get("lang").asText().equals("en")) {
> {code}
> jsonNode.get("user").get("lang") may return null, leading to 
> NullPointerException.



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