jdk-24/jdk/test/java/util/ServiceLoader/modules/BadProvidersTest.java

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/**
 * @test
 * @library /lib/testlibrary
 * @modules jdk.compiler
 * @build CompilerUtils
 * @run testng/othervm BadProvidersTest
 * @summary Basic test of ServiceLoader with bad provider and bad provider
 *          factories deployed on the module path
 */

import java.lang.module.Configuration;
import java.lang.module.ModuleFinder;
import java.lang.reflect.Layer;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.List;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import java.util.ServiceLoader.Provider;
import java.util.Set;
import java.util.stream.Collectors;

import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;
import static org.testng.Assert.*;

/**
 * Basic test of `provides S with PF` and `provides S with P` where the provider
 * factory or provider
 */

public class BadProvidersTest {

    private static final String TEST_SRC = System.getProperty("test.src");

    private static final Path USER_DIR   = Paths.get(System.getProperty("user.dir"));
    private static final Path SRC_DIR    = Paths.get(TEST_SRC, "modules");

    private static final Path BADFACTORIES_DIR = Paths.get(TEST_SRC, "badfactories");
    private static final Path BADPROVIDERS_DIR = Paths.get(TEST_SRC, "badproviders");

    private static final String TEST1_MODULE = "test1";
    private static final String TEST2_MODULE = "test2";

    private static final String TEST_SERVICE = "p.Service";

    /**
     * Compiles a module, returning a module path with the compiled module.
     */
    private Path compileTest(String moduleName) throws Exception {
        Path dir = Files.createTempDirectory(USER_DIR, "mods");
        Path output = Files.createDirectory(dir.resolve(moduleName));
        boolean compiled = CompilerUtils.compile(SRC_DIR.resolve(moduleName), output);
        assertTrue(compiled);
        return dir;
    }

    /**
     * Resolves a test module and loads it into its own layer. ServiceLoader
     * is then used to load all providers.
     */
    private List<Provider> loadProviders(Path mp, String moduleName) throws Exception {
        ModuleFinder finder = ModuleFinder.of(mp);

        Layer bootLayer = Layer.boot();

        Configuration cf = bootLayer.configuration()
                .resolveRequiresAndUses(finder, ModuleFinder.of(), Set.of(moduleName));

        ClassLoader scl = ClassLoader.getSystemClassLoader();

        Layer layer = Layer.boot().defineModulesWithOneLoader(cf, scl);

        Class<?> service = layer.findLoader(moduleName).loadClass(TEST_SERVICE);

        return ServiceLoader.load(layer, service)
                .stream()
                .collect(Collectors.toList());
    }

    @Test
    public void sanityTest1() throws Exception {
        Path mods = compileTest(TEST1_MODULE);
        List<Provider> list = loadProviders(mods, TEST1_MODULE);
        assertTrue(list.size() == 1);

        // the provider is a singleton, enforced by the provider factory
        Object p1 = list.get(0).get();
        Object p2 = list.get(0).get();
        assertTrue(p1 != null);
        assertTrue(p1 == p2);
    }

    @Test
    public void sanityTest2() throws Exception {
        Path mods = compileTest(TEST2_MODULE);
        List<Provider> list = loadProviders(mods, TEST2_MODULE);
        assertTrue(list.size() == 1);
        Object p = list.get(0).get();
        assertTrue(p != null);
    }


    @DataProvider(name = "badfactories")
    public Object[][] createBadFactories() {
        return new Object[][] {
                { "classnotpublic",     null },
                { "methodnotpublic",    null },
                { "badreturntype",      null },
                { "returnsnull",        null },
                { "throwsexception",    null },
        };
    }


    @Test(dataProvider = "badfactories",
          expectedExceptions = ServiceConfigurationError.class)
    public void testBadFactory(String testName, String ignore) throws Exception {
        Path mods = compileTest(TEST1_MODULE);

        // compile the bad factory
        Path source = BADFACTORIES_DIR.resolve(testName);
        Path output = Files.createTempDirectory(USER_DIR, "tmp");
        boolean compiled = CompilerUtils.compile(source, output);
        assertTrue(compiled);

        // copy the compiled class into the module
        Path classFile = Paths.get("p", "ProviderFactory.class");
        Files.copy(output.resolve(classFile),
                   mods.resolve(TEST1_MODULE).resolve(classFile),
                   StandardCopyOption.REPLACE_EXISTING);

        // load providers and instantiate each one
        loadProviders(mods, TEST1_MODULE).forEach(Provider::get);
    }


    @DataProvider(name = "badproviders")
    public Object[][] createBadProviders() {
        return new Object[][] {
                { "notpublic",          null },
                { "ctornotpublic",      null },
                { "notasubtype",        null },
                { "throwsexception",    null }
        };
    }


    @Test(dataProvider = "badproviders",
          expectedExceptions = ServiceConfigurationError.class)
    public void testBadProvider(String testName, String ignore) throws Exception {
        Path mods = compileTest(TEST2_MODULE);

        // compile the bad provider
        Path source = BADPROVIDERS_DIR.resolve(testName);
        Path output = Files.createTempDirectory(USER_DIR, "tmp");
        boolean compiled = CompilerUtils.compile(source, output);
        assertTrue(compiled);

        // copy the compiled class into the module
        Path classFile = Paths.get("p", "Provider.class");
        Files.copy(output.resolve(classFile),
                   mods.resolve(TEST2_MODULE).resolve(classFile),
                   StandardCopyOption.REPLACE_EXISTING);

        // load providers and instantiate each one
        loadProviders(mods, TEST2_MODULE).forEach(Provider::get);
    }

}