Dawid Wysakowicz created FLINK-6943:

             Summary: Improve exceptions within 
                 Key: FLINK-6943
                 URL: https://issues.apache.org/jira/browse/FLINK-6943
             Project: Flink
          Issue Type: Bug
          Components: Core
            Reporter: Dawid Wysakowicz
            Assignee: Dawid Wysakowicz

Exception message seems to be inexact. 
Also if there is no SAM, sam would be null upon returning from the method.

The suggestion from a review was to change the message and add a check (for 
null sam) prior to returning.

Another suggestion is to check if the given method is an interface, as only for 
interface it is possible to pass lambda.

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