jdk

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/*
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 * Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test
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 * @bug 8197901 8209758
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 * @summary Redefine classes with enabling logging to verify Klass:external_name() during GC.
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 * @comment This test is simplified version of serviceability/jvmti/RedefineClasses/RedefineRunningMethods.java.
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 * @library /test/lib
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 * @modules java.compiler
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 *          java.instrument
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 * @requires vm.jvmti
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 * @run main RedefineClassHelper
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 * @run main/othervm -Xmx256m -XX:MaxMetaspaceSize=64m -javaagent:redefineagent.jar -Xlog:all=trace:file=all.log RedefineClasses
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 */
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// package access top-level class to avoid problem with RedefineClassHelper
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// and nested types.
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class RedefineClasses_B {
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    public static void test() {
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    }
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}
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public class RedefineClasses {
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    static Object[] obj = new Object[20];
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    public static String newB =
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            "class RedefineClasses_B {" +
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            "    public static void test() { " +
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            "    }" +
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            "}";
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    public static void main(String[] args) throws Exception {
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        RedefineClassHelper.redefineClass(RedefineClasses_B.class, newB);
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        RedefineClasses_B.test();
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        for (int i = 0; i < 20 ; i++) {
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            obj[i] = new byte[1024 * 1024];
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            System.gc();
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        }
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    }
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}
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