test/hotspot/jtreg/runtime/cds/CheckSharingWithDefaultArchive.java

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/**
 * @test Default CDS archive
 * @summary Sharing should be enabled by default on supported platform/binaries.
 *          No -Xshare:dump is needed. No -Xshare:auto or -Xshare:on in needed.
 *          Verify a set of well-known shared classes.
 * @requires vm.cds
 * @library /test/lib
 * @build jdk.test.whitebox.WhiteBox
 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
 *      -XX:+WhiteBoxAPI CheckSharingWithDefaultArchive -showversion
 */
import jdk.test.lib.Platform;
import jtreg.SkippedException;
import jdk.test.whitebox.WhiteBox;

public class CheckSharingWithDefaultArchive {
    public static void main(String[] args) throws Exception {
        if (!Platform.isDefaultCDSArchiveSupported()) {
            throw new SkippedException("Supported platform");
        }

        WhiteBox wb = WhiteBox.getWhiteBox();
        String classes[] = {"java.lang.Object",
                            "java.lang.String",
                            "java.lang.Class"};
        // If maping fails, sharing is disabled
        if (wb.isSharingEnabled()) {
            for (int i = 0; i < classes.length; i++) {
                Class c = Class.forName(classes[i]);
                if (wb.isSharedClass(c)) {
                    System.out.println(classes[i] + " is shared.");
                } else {
                    throw new RuntimeException(classes[i] + " is not shared");
                }
            }
        } else {
           throw new SkippedException("Sharing is not enabled.");
        }
    }
}