russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
106 lines
3.4 KiB
Java
106 lines
3.4 KiB
Java
/*
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* Copyright (c) 2021, 2026, 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 8265237
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* @summary tests StringJoiner OOME when joining sub-max-length Strings
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* @modules java.base/jdk.internal.util
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* @requires vm.bits == "64" & os.maxMemory > 4G
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* @run junit/othervm -Xmx4g -XX:+CompactStrings StringJoinerOomUtf16Test
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*/
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import static jdk.internal.util.ArraysSupport.SOFT_MAX_ARRAY_LENGTH;
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import static org.junit.jupiter.api.Assertions.fail;
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import java.util.StringJoiner;
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import org.junit.jupiter.api.Tag;
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import org.junit.jupiter.api.Test;
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@Tag("unit")
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@Tag("string")
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@Tag("util")
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@Tag("libs")
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public class StringJoinerOomUtf16Test {
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// the sum of lengths of the following two strings is way less than
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// SOFT_MAX_ARRAY_LENGTH, but the byte[] array holding the UTF16 representation
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// would need to be bigger than Integer.MAX_VALUE...
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private static final String HALF_MAX_LATIN1_STRING =
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"*".repeat(SOFT_MAX_ARRAY_LENGTH >> 1);
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private static final String OVERFLOW_UTF16_STRING =
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"\u017D".repeat(((Integer.MAX_VALUE - SOFT_MAX_ARRAY_LENGTH) >> 1) + 1);
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@Test
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public void OOM1() {
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try {
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new StringJoiner("")
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.add(HALF_MAX_LATIN1_STRING)
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.add(OVERFLOW_UTF16_STRING)
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.toString();
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fail("Should have thrown OutOfMemoryError");
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} catch (OutOfMemoryError ex) {
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System.out.println("Expected: " + ex);
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}
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}
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@Test
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public void OOM2() {
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try {
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new StringJoiner(HALF_MAX_LATIN1_STRING)
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.add("")
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.add(OVERFLOW_UTF16_STRING)
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.toString();
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fail("Should have thrown OutOfMemoryError");
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} catch (OutOfMemoryError ex) {
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System.out.println("Expected: " + ex);
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}
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}
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@Test
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public void OOM3() {
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try {
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new StringJoiner(OVERFLOW_UTF16_STRING)
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.add("")
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.add(HALF_MAX_LATIN1_STRING)
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.toString();
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fail("Should have thrown OutOfMemoryError");
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} catch (OutOfMemoryError ex) {
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System.out.println("Expected: " + ex);
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}
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}
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@Test
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public void OOM4() {
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try {
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new StringJoiner("", HALF_MAX_LATIN1_STRING, OVERFLOW_UTF16_STRING)
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.toString();
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fail("Should have thrown OutOfMemoryError");
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} catch (OutOfMemoryError ex) {
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System.out.println("Expected: " + ex);
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}
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}
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}
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