test/runtime/BadObjectClass/BootstrapRedefine.java

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/*
 * @test
 * @bug 6583051
 * @summary Give error if java.lang.Object has been incompatibly overridden on the bootpath
 * @library /testlibrary
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run main BootstrapRedefine
 */

import jdk.test.lib.*;

public class BootstrapRedefine {

    public static void main(String[] args) throws Exception {
        String source = "package java.lang;" +
                        "public class Object {" +
                        "    void dummy1() { return; }" +
                        "    void dummy2() { return; }" +
                        "    void dummy3() { return; }" +
                        "}";

        ClassFileInstaller.writeClassToDisk("java/lang/Object",
                                        InMemoryJavaCompiler.compile("java.lang.Object", source,
                                        "-Xmodule:java.base"),
                                        "mods/java.base");

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xpatch:mods", "-version");
        new OutputAnalyzer(pb.start())
            .shouldContain("Incompatible definition of java.lang.Object")
            .shouldHaveExitValue(1);
    }
}