Looking for Sponsor: JDK-8229959 Convert proxy class to use constant dynamic

[Johannes Kuhn]

On 22.11.2019 22:41, Remi Forax wrote:
> i wonder if some codes in the wild rely on that ?
I don't think some code does, but you never know.
> There is perhaps a better way, as part of the branch nestmates of valhalla, Mandy has added a way to transfer a live object to a Class when defining it, with that you can send all the Methods as an array and in the bootstrap method of a condy, access to the right method by extracting it from the array using an index.
> It will avoid the whole serialization/deserialization of Methods dance.

That is a better idea - and could be done today using 
Unsafe.defineAnonymousClass - If it didn't need a host class.

> Here is an example:
>    https://gist.github.com/forax/d0f0034190bc479b86ce977fb94ca176
>
> I believe those changes are planned for Java 14 so will be integrated very soon.

It looks like the class is defined using 
Lookup.defineHiddenClassWithClassData - in the current proxy 
implementation there is no lookup object.
Also, I'm not sure if the defined proxy class needs to be findable.
In short: I did not do an evaluation on what unspecified parts of a 
proxy can be changed without breaking someones cod