[External] : Re: JEP-412 & OpenGL

[Martin Pernollet]

Thank you Maurizio. I confirm that using IntelliJ allows editing a program without having to rebuild outside the IDE.

I kept my questions and your answers there : https://github.com/jzy3d/panama-gl/issues/3

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

Le lundi 11 octobre 2021 à 16:47, Maurizio Cimadamore <maurizio.cimadamore at oracle.com> a écrit :

> On 11/10/2021 12:43, Maurizio Cimadamore wrote:
>
> > Both issues you report seem to have to do with Eclipse having issues
> >
> > with the shape of the generated code that comes out of jextract. We
> >
> > try to hide most of the API away (e.g. glut_h_3 is not really
> >
> > accessible, and only has package-private access) - but it seems like
> >
> > Eclipse emits references to these classes, instead of emitting
> >
> > references to the public accessible subclass. I'm pretty sure that the
> >
> > bytecode coming out of Eclipse is different than the one from javac,
> >
> > and this is the issue. All the calls in your code should have the form
> >
> > opengl.glut_h::<methodName> - but it seems like the bytecode generated
> >
> > by Eclipse ends up with opengl.glut_h_N::<methodName> instead.
> >
> > I have no such problems when running code with IntelliJ - but IntelliJ
> >
> > is using javac as a backend compiler, so that might explain the
> >
> > discrepancy.
>
> Performed some more tests:
>
>     // pkg/A.java
>     package pkg;
>
>     class A {
>         public static void foo() { }
>     }
>
>     // pkg/B.java
>     package pkg;
>
>     public class B extends A { }
>
>     // Test.java
>     import static pkg.B.foo;
>
>     class Test {
>          public static void main(String[] args) {
>              foo();
>          }
>     }
>
>
> I compiled this with both javac and the Eclipse compiler. With javac,
>
> Test::main has the following bytecode:
>
>               0: invokestatic  #2                  // Method pkg/B.foo:()V
>
>
> With Eclipse, I see the following:
>
>               0: invokestatic  #12                 // Method pkg/A.foo:()V
>
>
> Of course, the code compiled with javac runs, whereas the one compiler
>
> with Eclipse fails with this:
>
>     Exception in thread "main" java.lang.IllegalAccessError: failed to
>     access class pkg.A from class Test (pkg.A and Test are in unnamed module
>     of loader 'app')
>          at Test.main(Test.java:5)
>
>
>
> Which seems like a bug in the Eclipse compiler, and an unfortunate one
>
> too, since jextract relies on this pattern quite a lot.
>
> Maurizio