hotspot/test/runtime/modules/AccessCheck/ExportAllUnnamed.java

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/*
 * @test
 * @summary Test if package p2 in module m2 is exported to all unnamed,
 *          then class p1.c1 in an unnamed module can read p2.c2 in module m2.
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 * @modules java.base/jdk.internal.module
 * @compile myloaders/MySameClassLoader.java
 * @compile p2/c2.java
 * @compile p1/c1.java
 * @run main/othervm -Xbootclasspath/a:. ExportAllUnnamed
 */

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

import java.lang.module.Configuration;
import java.lang.module.ModuleDescriptor;
import java.lang.module.ModuleFinder;
import java.lang.reflect.Layer;
import java.lang.reflect.Module;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import myloaders.MySameClassLoader;

//
// ClassLoader1 --> defines m1 --> no packages
//                  defines m2 --> packages p2
//
// m1 can read m2
// package p2 in m2 is exported unqualifiedly
//
// class p1.c1 defined in an unnamed module tries to access p2.c2 defined in m2
// Access allowed, an unnamed module can read all modules and p2 in module
//           m2 is exported to all unnamed modules.

public class ExportAllUnnamed {

    // 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:     m1
        // Can read:          java.base, m2
        // Packages:          none
        // Packages exported: none
        ModuleDescriptor descriptor_m1 =
                ModuleDescriptor.module("m1")
                        .requires("java.base")
                        .requires("m2")
                        .build();

        // Define module:     m2
        // Can read:          java.base
        // Packages:          p2
        // Packages exported: p2 is exported unqualifiedly
        ModuleDescriptor descriptor_m2 =
                ModuleDescriptor.module("m2")
                        .requires("java.base")
                        .exports("p2", Set.of("m1"))
                        .build();

        // Set up a ModuleFinder containing all modules for this layer.
        ModuleFinder finder = ModuleLibrary.of(descriptor_m1, descriptor_m2);

        // Resolves "m1"
        Configuration cf = Layer.boot()
                .configuration()
                .resolveRequires(finder, ModuleFinder.of(), Set.of("m1"));

        // map each module to differing class loaders for this test
        Map<String, ClassLoader> map = new HashMap<>();
        map.put("m1", MySameClassLoader.loader1);
        map.put("m2", MySameClassLoader.loader1);

        // Create Layer that contains m1 & m2
        Layer layer = Layer.boot().defineModules(cf, map::get);

        assertTrue(layer.findLoader("m1") == MySameClassLoader.loader1);
        assertTrue(layer.findLoader("m2") == MySameClassLoader.loader1);
        assertTrue(layer.findLoader("java.base") == null);

        Class p2_c2_class = MySameClassLoader.loader1.loadClass("p2.c2");
        Module m2 = p2_c2_class.getModule();

        // Export m2/p2 to all unnamed modules.
        jdk.internal.module.Modules.addExportsToAllUnnamed(m2, "p2");

        // now use the same loader to load class p1.c1
        Class p1_c1_class = MySameClassLoader.loader1.loadClass("p1.c1");
        try {
            p1_c1_class.newInstance();
        } catch (IllegalAccessError e) {
            throw new RuntimeException("Test Failed, unnamed module failed to access public type p2.c2 " +
                                       "that was exported to all unnamed");
        }
    }

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