test/hotspot/jtreg/runtime/logging/LoaderConstraintsTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test LoaderConstraintsTest
 * @bug 8149996
 * @modules java.base/jdk.internal.misc
 * @library /test/lib /runtime/testlibrary classes
 * @run driver LoaderConstraintsTest
 */

import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import java.lang.ref.WeakReference;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class LoaderConstraintsTest {
    private static OutputAnalyzer out;
    private static ProcessBuilder pb;
    private static class ClassUnloadTestMain {
        public static void main(String... args) throws Exception {
            String className = "test.Empty";
            ClassLoader cl = ClassUnloadCommon.newClassLoader();
            Class<?> c = cl.loadClass(className);
            cl = null; c = null;
            ClassUnloadCommon.triggerUnloading();
        }
    }

    // Use the same command-line heap size setting as ../ClassUnload/UnloadTest.java
    static ProcessBuilder exec(String... args) throws Exception {
        List<String> argsList = new ArrayList<>();
        Collections.addAll(argsList, args);
        Collections.addAll(argsList, "-Xmn8m");
        Collections.addAll(argsList, "-Dtest.classes=" + System.getProperty("test.classes","."));
        Collections.addAll(argsList, ClassUnloadTestMain.class.getName());
        return ProcessTools.createJavaProcessBuilder(argsList.toArray(new String[argsList.size()]));
    }

    public static void main(String... args) throws Exception {

        // -XX:+TraceLoaderConstraints
        pb = exec("-XX:+TraceLoaderConstraints");
        out = new OutputAnalyzer(pb.start());
        out.getOutput();
        out.shouldContain("[class,loader,constraints] adding new constraint for name: java/lang/Class, loader[0]: jdk/internal/loader/ClassLoaders$AppClassLoader, loader[1]: <bootloader>");

        // -Xlog:class+loader+constraints=info
        pb = exec("-Xlog:class+loader+constraints=info");
        out = new OutputAnalyzer(pb.start());
        out.shouldContain("[class,loader,constraints] adding new constraint for name: java/lang/Class, loader[0]: jdk/internal/loader/ClassLoaders$AppClassLoader, loader[1]: <bootloader>");

        // -XX:-TraceLoaderConstraints
        pb = exec("-XX:-TraceLoaderConstraints");
        out = new OutputAnalyzer(pb.start());
        out.shouldNotContain("[class,loaderconstraints]");

        // -Xlog:class+loader+constraints=off
        pb = exec("-Xlog:class+loader+constraints=off");
        out = new OutputAnalyzer(pb.start());
        out.shouldNotContain("[class,loader,constraints]");

    }
}