61 lines
2.4 KiB
Java
61 lines
2.4 KiB
Java
/*
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* Copyright (c) 2012, 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 7173432
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* @summary If the key to be inserted into a HashMap is null and the table
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* needs to be resized as part of the insertion then addEntry will try to
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* recalculate the hash of a null key. This will fail with an NPE.
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*/
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import java.util.*;
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public class NullKeyAtResize {
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public static void main(String[] args) throws Exception {
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List<Object> old_order = new ArrayList<>();
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Map<Object,Object> m = new HashMap<>(16);
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int number = 0;
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while(number < 100000) {
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m.put(null,null); // try to put in null. This may cause resize.
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m.remove(null); // remove it.
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Integer adding = (number += 100);
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m.put(adding, null); // try to put in a number. This wont cause resize.
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List<Object> new_order = new ArrayList<>();
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new_order.addAll(m.keySet());
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new_order.remove(adding);
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if(!old_order.equals(new_order)) {
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// we resized and didn't crash.
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System.out.println("Encountered resize after " + (number / 100) + " iterations");
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break;
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}
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// remember this order for the next time around.
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old_order.clear();
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old_order.addAll(m.keySet());
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}
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if(number == 100000) {
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throw new Error("Resize never occurred");
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}
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}
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}
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