Unsafe.defineAnonymousClass no longer exists in Java17!

[Luc Chapon]

Thanks, and yes, I know.
It’s still not clear how to rewrite the “offending” part…

final MethodHandle mh = MethodHandles.lookup().findVirtual(Unsafe.class,
"defineAnonymousClass",

MethodType.methodType(Class.class, Class.class, byte[].class, Object[].class
));

final Field f = Unsafe.class.getDeclaredField("theUnsafe");

f.setAccessible(true);

return mh.bindTo(f.get(null));


Le mer. 24 janv. 2024 à 14:22, Remi Forax <forax at univ-mlv.fr> a écrit :

>
>
> ------------------------------
>
> *From: *"Luc Chapon" <sxilderik at gmail.com>
> *To: *"nashorn-dev" <nashorn-dev at openjdk.org>
> *Sent: *Wednesday, January 24, 2024 1:02:48 PM
> *Subject: *Unsafe.defineAnonymousClass no longer exists in Java17!
>
> Hello all
>
> First message here
>
> We are facing a problem re Nashorn (latest) and java17
>
> In Context.java, line 330, you try to get a handle to a no longer existent
> method, Unsafe.defineAnonymousClass
>
> And fail of course.
>
> I’m trying to rewrite this part for our own temporary urgent need
> according to this.
>
> https://www.oracle.com/java/technologies/javase/17-relnote-issues.html
>
> core-libs
> *➜
> <https://www.oracle.com/java/technologies/javase/17-relnote-issues.html#JDK-8243287> Removal
> of sun.misc.Unsafe::defineAnonymousClass*
>
> sun.misc.Unsafe::defineAnonymousClass API has been removed in JDK 17. The
> API replacement is
> java.lang.invoke.MethodHandles.Lookup::defineHiddenClass and
> java.lang.invoke.MethodHandles.Lookup::defineHiddenClassWithClassData.
>
>
> Are you aware of the problem? Is there a fix already available?
>
>
> Hello,
> defineAnonymousClass have been replaced by Lookup.defineHiddenClass(...)
> [1] which is a public API.
>
>
> Thank you!
>
>
> regards,
> Rémi
>
>
> Luc Chapon
> ChapsVision
> Suresnes, France
>
>
> [1]
> https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/invoke/MethodHandles.Lookup.html#defineHiddenClass(byte[],boolean,java.lang.invoke.MethodHandles.Lookup.ClassOption..
> .)
>
>
>
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