jdk/test/java/lang/ClassLoader/CustomSystemLoader/InitSystemLoaderTest.java
author mchung
Tue, 09 May 2017 10:34:13 -0700
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8179950: Custom system class loader using Enum.valueOf in its initialization triggers java.lang.InternalError Reviewed-by: alanb, dfuchs, lancea
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/*
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 * Copyright (c) 2017, 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 8179950
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 * @build CustomLoader InitSystemLoaderTest
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 * @run main/othervm -Djava.system.class.loader=CustomLoader InitSystemLoaderTest
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 * @summary Test custom system loader initialization and verify their ancestors
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 */
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public class InitSystemLoaderTest {
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    public static void main(String... args) {
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        // check that system class loader is the custom loader
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        ClassLoader loader = ClassLoader.getSystemClassLoader();
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        if (loader != CustomLoader.INSTANCE) {
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            throw new RuntimeException("Expected custom loader: "
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                + CustomLoader.INSTANCE + " got: " + loader);
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        }
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        // parent of the custom loader should be builtin system class loader
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        ClassLoader builtinSystemLoader = loader.getParent();
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        ClassLoader grandparent = builtinSystemLoader.getParent();
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        if (grandparent != ClassLoader.getPlatformClassLoader()) {
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            throw new RuntimeException("Expected class loader ancestor: "
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                + ClassLoader.getPlatformClassLoader() + " got: " + grandparent);
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        }
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    }
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}