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=lib Make use of CompletionStage#handle instead of whenComplete #10181
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FYI @He-Pin
JDK 11 has MinimalStage which is a CompletableFuture (also CompletionStage), with UnsupportedOperationException in lot of method bodies (like isDone).
With this change we throw from here at line 73 if encounered a MinimalStage.
I am not claiming this is a bug, or MinimalStage is flawed; neither know whether it is a valid case to have MinimalStage flying around, just letting you know.
Don't shoot the messenger please ;)
Others also implement safety measures: Kotlin/kotlinx.coroutines#2456
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Many thanks @nmarton-da. It reproduces indeed:
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It seems play framework had to work around it: playframework/playframework#11993
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Sorry for the delay, I was busy at shopping festival, will submit fix to other repository this weekend.