test/hotspot/jtreg/runtime/cds/appcds/LotsOfJRTClasses.java

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import java.util.ArrayList;

import jdk.test.lib.cds.CDSTestUtils;
import jdk.test.lib.cds.CDSOptions;

/*
 * @test
 * @summary Try to archive lots of classes by searching for classes from the jrt:/ file system. With JDK 12
 *          this will produce an archive with over 30,000 classes.
 * @requires vm.cds
 * @library /test/lib /test/hotspot/jtreg/runtime/cds/appcds
 * @run driver/timeout=500 LotsOfJRTClasses
 */

public class LotsOfJRTClasses {

    public static void main(String[] args) throws Exception {
        ArrayList<String> list = new ArrayList<>();
        long start = System.currentTimeMillis();
        TestCommon.findAllClasses(list);
        System.out.println("findAllClasses = " + (System.currentTimeMillis() - start) + "ms");
        CDSOptions opts = new CDSOptions();
        opts.setClassList(list);
        opts.addSuffix("--add-modules");
        opts.addSuffix("ALL-SYSTEM");
        opts.addSuffix("-Xlog:hashtables");
        opts.addSuffix("-Xmx500m");
        opts.addSuffix("-XX:MetaspaceSize=500M"); // avoid heap fragmentation by avoiding metaspace-limit induced GCs
        opts.addSuffix("-Xlog:gc+region+cds");
        opts.addSuffix("-Xlog:cds=debug");  // test detailed metadata info printing

        CDSTestUtils.createArchiveAndCheck(opts);
    }
}