why a typeguard single implementation interface field

[Aleksey Shipilev]

On 01/30/2017 10:50 AM, Peter Veentjer wrote:
> This code shows there is a typeguard; even though there is only a single
> implementation of the 'Service' interface. Why is this typeguard required? If a
> second conflicting implementation of Service would be loaded, why not rely on
> CHA to take care of deoptimizing the code?

Short answer: CHA is not handling interfaces well.

See:
 https://bugs.openjdk.java.net/browse/JDK-6986483
 https://bugs.openjdk.java.net/browse/JDK-8065760

Thanks,
-Aleksey

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