[jira] [Created] (FLINK-6943) Improve exceptions within TypeExtractionUtils#getSingleAbstractMethod

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[jira] [Created] (FLINK-6943) Improve exceptions within TypeExtractionUtils#getSingleAbstractMethod

JIRA jira@apache.org
Dawid Wysakowicz created FLINK-6943:
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             Summary: Improve exceptions within TypeExtractionUtils#getSingleAbstractMethod
                 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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