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From "Uwe Schindler" <>
Subject RE: Removing our use of sun.misc.Unsafe
Date Fri, 13 Oct 2017 07:52:42 GMT

getting Unsafe does not print a warning, as reflection is "open" on the jdk.unsupported module.
This was decided in JEP 260.


Uwe Schindler
Achterdiek 19, D-28357 Bremen

> -----Original Message-----
> From: Jochen Theodorou []
> Sent: Friday, October 13, 2017 8:49 AM
> To:
> Subject: Re: Removing our use of sun.misc.Unsafe
> On 13.10.2017 05:41, Paul King wrote:
> >
> > I was going to try to progress removing Unsafe but I am a little unsure
> > where others might have gotten up to in previous investigations. So, I
> > have a bunch of questions in case others have some answers/ideas.
> >
> > Does anyone know whether variable handles might work for us? Inside
> some
> > kind of jdk9 plugin I guess?
> in my opinion no. Not to operate on private fields of java.lang.String
> without a Lookup object that has the rights to operate on the fields,
> which would come from java.lang.String itself. As such a thing is not
> provided, there will be no possibility.
> > Has anyone looked into how we might package up our unsafe usage in such
> > a way that it could be used in pre-jdk9 environments where var handles
> > aren't available but not result in errors/warnings in jdk9?
> to avoid the warning we would have to not even try to get Unsafe. I
> would extend our vmplugin system for this then.
> > What tests were being run to ensure that performance wasn't lost?
> None... but what are you going to do if there is a performance loss? If
> there is no alternative, then there is no alternative. And then there is
> nothing to compare against, thus there is no performance loss, as a loss
> requires a base, which then does not exist anymore.
> > Can we remove the OFFSET enum in FastStringUtils described as applicable
> > for JDK4/5?
> Well... officially we do not JDK4... I think our minimum for 2.4 was
> JDK6? In that case... yeah I guess so ;)
> bye Jochen

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