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

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/*
 * @test
 * @summary If -Djava.system.class.loader=xxx is specified in command-line, disable archived non-system classes
 * @requires vm.cds
 * @library /test/lib
 * @compile test-classes/TestClassLoader.java
 * @compile test-classes/ReportMyLoader.java
 * @compile test-classes/TrySwitchMyLoader.java
 * @run driver 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 = "Archived non-system classes are 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
    TestCommon.run(
        "-verbose:class",
        "-cp", appJar,
        "ReportMyLoader")
      .assertNormalExit("[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
    TestCommon.run(
        "-cp", appJar,
        "-Djava.system.class.loader=no.such.Klass",
        "ReportMyLoader")
      .assertAbnormalExit(output -> {
          output.shouldContain(warning);
          output.shouldContain("ClassNotFoundException: no.such.Klass");
        });

    // (2) Try to execute the archive with -Djava.system.class.loader=TestClassLoader,
    //     it should run, but archived non-system classes should be disabled
    TestCommon.run(
        "-verbose:class",
        "-cp", appJar,
        "-Xlog:cds",
        "-Djava.system.class.loader=TestClassLoader",
        "ReportMyLoader")
      .assertNormalExit("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.
      .assertNormalExit(output -> {
        output.shouldMatch(".class,load. TestClassLoader source: file:");
        output.shouldMatch(".class,load. ReportMyLoader source: file:.*" + jarFileName);
        output.shouldContain("full module graph: disabled due to incompatible property: java.system.class.loader=");
        });

    // (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.
    TestCommon.run(
        "-verbose:class",
        "-cp", appJar,
        "TrySwitchMyLoader")
      .assertNormalExit("[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");
  }
}