Runtime code generation and barriers in migrating away from JVM-interal APIs

Rafael Winterhalter rafael.wth at
Sun Jan 7 17:46:33 UTC 2018

You are right Peter, that does work. I assumed that the module to which a
package was opened automatically received the access rights for any lookup
object, thanks for pointing it out to me. This makes my proposal of C

I hope that D and E are considered nevertheless!

Also, thank you Volker for forwarding this to the correct mailinglists.

2018-01-07 17:40 GMT+01:00 Peter Levart <peter.levart at>:

> Hi Rafael,
> On 01/07/18 13:10, Volker Simonis wrote:
> At a result, even with Java 9 being supported by many popular frameworks, a
> migration away from internal APIs has not yet been achieved. I would
> therefore like to suggest the following extensions:
> C) When a module opens a package, other modules should gain package access
> to this package when creating method handle lookups. This way, if a user
> opens a package containing Spring beans to the Spring framework, it could
> proxy all of these beans as it does today. Since opening a package also
> permits reflection on package-private types and methods of this package,
> this is not a security concern either.
> Have you checked the new JDK 9 method: java.lang.invoke.MethodHandles#privateLookupIn
> ?
> I believe it should do the trick.
> Regards, Peter

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