jdk-24/test/hotspot/jtreg/runtime/appcds/jigsaw/PatchModule/PatchJavaBase.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @requires vm.cds
 * @summary sharing is disabled if java.base is patch at runtime
 * @library ../..
 * @library /test/hotspot/jtreg/testlibrary
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          jdk.jartool/sun.tools.jar
 * @build PatchMain
 * @run main PatchJavaBase
 */

import jdk.test.lib.compiler.InMemoryJavaCompiler;
import jdk.test.lib.process.OutputAnalyzer;

public class PatchJavaBase {
    private static String moduleJar;

    public static void main(String args[]) throws Throwable {

        String source = "package java.lang; "                       +
                        "public class NewClass { "                  +
                        "    static { "                             +
                        "        System.out.println(\"I pass!\"); " +
                        "    } "                                    +
                        "}";

        ClassFileInstaller.writeClassToDisk("java/lang/NewClass",
             InMemoryJavaCompiler.compile("java.lang.NewClass", source, "--patch-module=java.base"),
             System.getProperty("test.classes"));

        JarBuilder.build("javabase", "java/lang/NewClass");
        moduleJar = TestCommon.getTestJar("javabase.jar");

        System.out.println("Test dumping with --patch-module");
        OutputAnalyzer output =
            TestCommon.dump(null, null,
                "--patch-module=java.base=" + moduleJar,
                "PatchMain", "java.lang.NewClass");
        TestCommon.checkDump(output, "Loading classes to share");

        output = TestCommon.execCommon(
            "-XX:+UnlockDiagnosticVMOptions",
            "--patch-module=java.base=" + moduleJar,
            "PatchMain", "java.lang.NewClass");
        output.shouldContain("CDS is disabled when java.base module is patched");
    }
}