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 * version 2 for more details (a copy is included in the LICENSE file that

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/*

 * @test

 * @summary Class p1.c1 in an unnamed module cannot read p2.c2 in module second_mod,

 *          even after p2 is exported to all unnamed. Ensures constant

 *          access check answers when not accessible due to exportedness.

 * @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 AccessExportTwice

 */

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 first_mod --> no packages

//                  defines second_mod --> packages p2

//

// first_mod can read second_mod

// package p2 in second_mod is exported to first_mod

//

// class p1.c1 defined in an unnamed module tries to access p2.c2 defined in second_mod

// Access is not allowed, even after p2 is exported to all unnamed modules.

public class AccessExportTwice {

    // Create a Layer over the boot layer.

    // Define modules within this layer to test access between

    // publicly defined classes within packages of those modules.

    public void createLayerOnBoot() throws Throwable {

        // Define module:     first_mod

        // Can read:          java.base, second_mod

        // Packages:          none

        // Packages exported: none

        ModuleDescriptor descriptor_first_mod =

                        .requires("java.base")

                        .requires("second_mod")

                        .build();

        // Define module:     second_mod

        // Can read:          java.base

        // Packages:          p2

        // Packages exported: p2 is exported to first_mod

        ModuleDescriptor descriptor_second_mod =

                        .requires("java.base")

                        .exports("p2", Set.of("first_mod"))

                        .build();

        // Set up a ModuleFinder containing all modules for this layer

        ModuleFinder finder = ModuleLibrary.of(descriptor_first_mod, descriptor_second_mod);

        // Resolves "first_mod"

        Configuration cf = Layer.boot()

                .configuration()

        // Map each module to the same class loader

        Map<String, ClassLoader> map = new HashMap<>();

        map.put("first_mod", MySameClassLoader.loader1);

        map.put("second_mod", MySameClassLoader.loader1);

        // Create Layer that contains first_mod & second_mod

        Layer layer = Layer.boot().defineModules(cf, map::get);

        assertTrue(layer.findLoader("first_mod") == MySameClassLoader.loader1);

        assertTrue(layer.findLoader("second_mod") == MySameClassLoader.loader1);

        assertTrue(layer.findLoader("java.base") == null);

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

        // Use the same loader to load class p1.c1

        Class p1_c1_class = MySameClassLoader.loader1.loadClass("p1.c1");

        // First access check for p1.c1

        try {

            p1_c1_class.newInstance();

            throw new RuntimeException("Test Failed, the unnamed module should not have access to public type p2.c2");

        } catch (IllegalAccessError e) {

            String message = e.getMessage();

            if (!(message.contains("cannot access") &&

                  message.contains("because module second_mod does not export p2 to unnamed module"))) {

                throw new RuntimeException("Wrong message: " + message);

            } else {

                System.out.println("Test Succeeded at attempt #1");

            }

        }

        // Export second_mod/p2 to all unnamed modules.

        Module second_mod = p2_c2_class.getModule();

        jdk.internal.module.Modules.addExportsToAllUnnamed(second_mod, "p2");

        // Second access check for p1.c1, should have same result as first

        try {

            p1_c1_class.newInstance();

            throw new RuntimeException("Test Failed, access should have been cached above");

        } catch (IllegalAccessError e) {

            String message = e.getMessage();

            if (!(message.contains("cannot access") &&

                  message.contains("because module second_mod does not export p2 to unnamed module"))) {

                throw new RuntimeException("Wrong message: " + message);

            } else {

                System.out.println("Test Succeeded at attempt #2");

            }

        }

    }

    public static void main(String args[]) throws Throwable {

      AccessExportTwice test = new AccessExportTwice();

      test.createLayerOnBoot();

    }

}