jdk-24/hotspot/test/runtime/modules/AccessCheck/DiffCL_PkgNotExp.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * accompanied this code).
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/*
 * @test
 * @summary Test that if module m1 can read module m2, but package p2 in m2 is not
 *          exported, then class p1.c1 in m1 can not read p2.c2 in m2.
 * @library /testlibrary /test/lib
 * @compile myloaders/MyDiffClassLoader.java
 * @compile p2/c2.java
 * @compile p1/c1.java
 * @build DiffCL_PkgNotExp
 * @run main/othervm -Xbootclasspath/a:. DiffCL_PkgNotExp
 */

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

import java.lang.reflect.Layer;
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.MyDiffClassLoader;

//
// ClassLoader1 --> defines m1 --> packages p1
// ClassLoader2 --> defines m2 --> packages p2
//
// m1 can read m2
// package p2 in m2 is not exported
//
// class p1.c1 defined in m1 tries to access p2.c2 defined in m2
// Access denied since p2 is not exported.
//
public class DiffCL_PkgNotExp {

    // 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:          p1
        // Packages exported: p1 is exported unqualifiedly
        ModuleDescriptor descriptor_m1 =
                new ModuleDescriptor.Builder("m1")
                        .requires("java.base")
                        .requires("m2")
                        .exports("p1")
                        .build();

        // Define module:     m2
        // Can read:          java.base
        // Packages:          p2
        // Packages exported: none
        ModuleDescriptor descriptor_m2 =
                new ModuleDescriptor.Builder("m2")
                        .requires("java.base")
                        .conceals("p2")
                        .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.empty(), Set.of("m1"));

        // map each module to differing class loaders for this test
        Map<String, ClassLoader> map = new HashMap<>();
        map.put("m1", MyDiffClassLoader.loader1);
        map.put("m2", MyDiffClassLoader.loader2);

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

        assertTrue(layer.findLoader("m1") == MyDiffClassLoader.loader1);
        assertTrue(layer.findLoader("m2") == MyDiffClassLoader.loader2);
        assertTrue(layer.findLoader("java.base") == null);

        // now use the same loader to load class p1.c1
        Class p1_c1_class = MyDiffClassLoader.loader1.loadClass("p1.c1");
        try {
            p1_c1_class.newInstance();
            throw new RuntimeException("Failed to get IAE (p2 in m2 is not exported)");
        } catch (IllegalAccessError e) {
          System.out.println(e.getMessage());
          if (!e.getMessage().contains("does not export")) {
              throw new RuntimeException("Wrong message: " + e.getMessage());
          }
        }
    }

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