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From "Chesnay Schepler (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-10234) Lambda usage in FutureUtils is ambigouos with Java 9
Date Tue, 28 Aug 2018 11:55:00 GMT
Chesnay Schepler created FLINK-10234:
----------------------------------------

             Summary: Lambda usage in FutureUtils is ambigouos with Java 9
                 Key: FLINK-10234
                 URL: https://issues.apache.org/jira/browse/FLINK-10234
             Project: Flink
          Issue Type: Sub-task
          Components: Core
    Affects Versions: 1.7.0
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler
             Fix For: 1.7.0


In {{FutureUtils}} the following code doesn't compile with java 9:
{code}
... = scheduledExecutor.schedule(
	() -> retryOperationWithDelay(resultFuture, operation, retries - 1, retryDelay,
	...,
	...,
	...);
{code}

The reason is that the compiler cannot determine whether the lambda should be a {{Runnable}}
or a {{Callable<V>}}, resulting in incompatible bounds for the return type.



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