jdk-24/test/hotspot/jtreg/runtime/modules/AccessCheck/AccessExportTwice.java

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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.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 =
                ModuleDescriptor.newModule("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 =
                ModuleDescriptor.newModule("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 = ModuleLayer.boot()
                .configuration()
                .resolve(finder, ModuleFinder.of(), Set.of("first_mod"));

        // 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
        ModuleLayer layer = ModuleLayer.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();
    }
}