jdk-24/test/hotspot/jtreg/runtime/appcds/SpecifySysLoaderProp.java

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/*
 *  @test
 *  @summary If -Djava.system.class.loader=xxx is specified in command-line, disable UseAppCDS
 *  AppCDS does not support uncompressed oops
 *  @requires (vm.opt.UseCompressedOops == null) | (vm.opt.UseCompressedOops == true)
 *  @library /test/lib
 *  @modules java.base/jdk.internal.misc
 *      jdk.jartool/sun.tools.jar
 *  @compile test-classes/TestClassLoader.java
 *  @compile test-classes/ReportMyLoader.java
 *  @compile test-classes/TrySwitchMyLoader.java
 *  @run main SpecifySysLoaderProp
 */

import java.io.*;
import jdk.test.lib.process.OutputAnalyzer;

public class SpecifySysLoaderProp {

  public static void main(String[] args) throws Exception {
    JarBuilder.build("sysloader", "TestClassLoader", "ReportMyLoader", "TrySwitchMyLoader");

    String jarFileName = "sysloader.jar";
    String appJar = TestCommon.getTestJar(jarFileName);
    TestCommon.testDump(appJar, TestCommon.list("ReportMyLoader"));
    String warning = "VM warning: UseAppCDS is disabled because the java.system.class.loader property is specified";


    // (0) Baseline. Do not specify -Djava.system.class.loader
    //     The test class should be loaded from archive
    OutputAnalyzer output = TestCommon.execCommon(
        "-verbose:class",
        "-cp", appJar,
        "ReportMyLoader");
    TestCommon.checkExec(output,
                         "[class,load] ReportMyLoader source: shared objects file",
                         "ReportMyLoader's loader = jdk.internal.loader.ClassLoaders$AppClassLoader@");

    // (1) Try to execute the archive with -Djava.system.class.loader=no.such.Klass,
    //     it should fail
    output = TestCommon.execCommon(
        "-cp", appJar,
        "-Djava.system.class.loader=no.such.Klass",
        "ReportMyLoader");
    try {
        output.shouldContain(warning);
        output.shouldContain("ClassNotFoundException: no.such.Klass");
    } catch (Exception e) {
        TestCommon.checkCommonExecExceptions(output, e);
    }

    // (2) Try to execute the archive with -Djava.system.class.loader=TestClassLoader,
    //     it should run, but AppCDS should be disabled
    output = TestCommon.execCommon(
        "-verbose:class",
        "-cp", appJar,
        "-Djava.system.class.loader=TestClassLoader",
        "ReportMyLoader");
    TestCommon.checkExec(output,
                         "ReportMyLoader's loader = jdk.internal.loader.ClassLoaders$AppClassLoader@", //<-this is still printed because TestClassLoader simply delegates to Launcher$AppLoader, but ...
                         "TestClassLoader.called = true", //<-but this proves that TestClassLoader was indeed called.
                         "TestClassLoader: loadClass(\"ReportMyLoader\","); //<- this also proves that TestClassLoader was indeed called.
    try {
        output.shouldMatch(".class,load. TestClassLoader source: file:");
        output.shouldMatch(".class,load. ReportMyLoader source: file:.*" + jarFileName);
    } catch (Exception e) {
        TestCommon.checkCommonExecExceptions(output, e);
    }

    // (3) Try to change the java.system.class.loader programmatically after
    //     the app's main method is executed. This should have no effect in terms of
    //     changing or switching the actual system class loader that's already in use.
    output = TestCommon.execCommon(
        "-verbose:class",
        "-cp", appJar,
        "TrySwitchMyLoader");
    TestCommon.checkExec(output,
                         "[class,load] ReportMyLoader source: shared objects file",
                         "TrySwitchMyLoader's loader = jdk.internal.loader.ClassLoaders$AppClassLoader@",
                         "ReportMyLoader's loader = jdk.internal.loader.ClassLoaders$AppClassLoader@",
                         "TestClassLoader.called = false");
  }
}