test/hotspot/jtreg/runtime/modules/ModuleStress/ModuleSameCLMain.java

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import static jdk.test.lib.Asserts.*;

import java.lang.module.Configuration;
import java.lang.module.ModuleDescriptor;
import java.lang.module.ModuleFinder;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

//
// ClassLoader1 --> defines m1x --> packages p1
// ClassLoader1 --> defines m2x --> packages p2
//
// m1x can read m2x
// package p2 in m2x is exported to m1x
//
// class p1.c1 defined in m1x tries to access p2.c2 defined in m2x
// Access allowed since m1x can read m2x and package p2 is exported to m1x.
//
public class ModuleSameCLMain {

    // Create a layer over the boot layer.
    // Define modules within this layer to test access between
    // publically defined classes within packages of those modules.
    public void createLayerOnBoot() throws Throwable {

        // Define module:     m1x
        // Can read:          java.base, m2x
        // Packages:          p1
        // Packages exported: p1 is exported to unqualifiedly
        ModuleDescriptor descriptor_m1x =
                ModuleDescriptor.newModule("m1x")
                        .requires("java.base")
                        .requires("m2x")
                        .exports("p1")
                        .build();

        // Define module:     m2x
        // Can read:          java.base
        // Packages:          p2
        // Packages exported: package p2 is exported to m1x
        ModuleDescriptor descriptor_m2x =
                ModuleDescriptor.newModule("m2x")
                        .requires("java.base")
                        .exports("p2", Set.of("m1x"))
                        .build();

        // Set up a ModuleFinder containing all modules for this layer.
        ModuleFinder finder = ModuleLibrary.of(descriptor_m1x, descriptor_m2x);

        // Resolves "m1x"
        Configuration cf = ModuleLayer.boot()
                .configuration()
                .resolve(finder, ModuleFinder.of(), Set.of("m1x"));

        // map each module to the same class loader for this test
        Map<String, ClassLoader> map = new HashMap<>();
        Loader1 cl1 = new Loader1();
        map.put("m1x", cl1);
        map.put("m2x", cl1);

        // Create layer that contains m1x & m2x
        ModuleLayer layer = ModuleLayer.boot().defineModules(cf, map::get);
        assertTrue(layer.findLoader("m1x") == cl1);
        assertTrue(layer.findLoader("m2x") == cl1);
        assertTrue(layer.findLoader("java.base") == null);

        // now use the same loader to load class p1.c1
        Class p1_c1_class = cl1.loadClass("p1.c1");
        try {
            p1_c1_class.newInstance();
        } catch (IllegalAccessError e) {
            throw new RuntimeException("Test Failed, an IAE should not be thrown since p2 is exported qualifiedly to m1x");
        }
    }

    public static void main(String args[]) throws Throwable {
      ModuleSameCLMain test = new ModuleSameCLMain();
      test.createLayerOnBoot();
    }

    static class Loader1 extends ClassLoader { }
}