RFR: 8280377: MethodHandleProxies does not correctly invoke default methods with varags [v4]

[liach]

On Tue, 25 Jan 2022 22:01:22 GMT, Johannes Kuhn <jkuhn at openjdk.org> wrote:

> My question was for when a library wants to implement something similar to `MethodHandleProxies.asInterfaceInstace`, and for example supports Interfaces with more than a single abstract method. Currently, such a library would also have to call `ReflectAccess.invokeDefault`, as the interface may not be accessible by the `InvocationHandler` (as it could be the case with `MethodHandleProxies.asInterfaceInstace`
> 
> But this might be a discussion for an other time. Patch looks good.

They will probably accept a `MethodHandles.Lookup` object to define a class for such a single-interface instance plus calling the default methods beyond the restrictions.

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PR: https://git.openjdk.java.net/jdk/pull/7185