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https://issues.apache.org/jira/browse/FLINK-4053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated FLINK-4053:
--------------------------
    Description: 
In RMQSource.java and RMQSink.java, there is code in the following pattern:
{code}
      connection = factory.newConnection();
      channel = connection.createChannel();
{code}
According to 
https://www.rabbitmq.com/releases/rabbitmq-java-client/current-javadoc/com/rabbitmq/client/Connection.html#createChannel()
 :

{code}
Returns:
a new channel descriptor, or null if none is available
{code}
The return value should be checked against null.

  was:
In RMQSource.java and RMQSink.java, there is code in the following pattern:
{code}
      connection = factory.newConnection();
      channel = connection.createChannel();
{code}
According to 
https://www.rabbitmq.com/releases/rabbitmq-java-client/current-javadoc/com/rabbitmq/client/Connection.html#createChannel()
 :
{code}
Returns:
a new channel descriptor, or null if none is available
{code}
The return value should be checked against null.


> Return value from Connection should be checked against null
> -----------------------------------------------------------
>
>                 Key: FLINK-4053
>                 URL: https://issues.apache.org/jira/browse/FLINK-4053
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Priority: Minor
>
> In RMQSource.java and RMQSink.java, there is code in the following pattern:
> {code}
>       connection = factory.newConnection();
>       channel = connection.createChannel();
> {code}
> According to 
> https://www.rabbitmq.com/releases/rabbitmq-java-client/current-javadoc/com/rabbitmq/client/Connection.html#createChannel()
>  :
> {code}
> Returns:
> a new channel descriptor, or null if none is available
> {code}
> The return value should be checked against null.



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