test/jdk/java/util/StringJoiner/StringJoinerOomUtf16Test.java - master - githubmirror/jdk21u

test/jdk/java/util/StringJoiner/StringJoinerOomUtf16Test.java
105 строк3 KB
Roland Mesde
8375231: Refactor util/ServiceLoader tests to use JUnit
30 мар 2026, 20:16
30 мар 2026, 20:16896dd48
/*
 * Copyright (c) 2021, 2026, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/**
 * @test
 * @bug 8265237
 * @summary tests StringJoiner OOME when joining sub-max-length Strings
 * @modules java.base/jdk.internal.util
 * @requires vm.bits == "64" & os.maxMemory > 4G
 * @run junit/othervm -Xmx4g -XX:+CompactStrings StringJoinerOomUtf16Test
 */


import static jdk.internal.util.ArraysSupport.SOFT_MAX_ARRAY_LENGTH;

import static org.junit.jupiter.api.Assertions.fail;

import java.util.StringJoiner;

import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;

@Tag("unit")
@Tag("string")
@Tag("util")
@Tag("libs")
public class StringJoinerOomUtf16Test {

    // the sum of lengths of the following two strings is way less than
    // SOFT_MAX_ARRAY_LENGTH, but the byte[] array holding the UTF16 representation
    // would need to be bigger than Integer.MAX_VALUE...
    private static final String HALF_MAX_LATIN1_STRING =
        "*".repeat(SOFT_MAX_ARRAY_LENGTH >> 1);
    private static final String OVERFLOW_UTF16_STRING =
        "\u017D".repeat(((Integer.MAX_VALUE - SOFT_MAX_ARRAY_LENGTH) >> 1) + 1);

    @Test
    public void OOM1() {
        try {
            new StringJoiner("")
                .add(HALF_MAX_LATIN1_STRING)
                .add(OVERFLOW_UTF16_STRING)
                .toString();
            fail("Should have thrown OutOfMemoryError");
        } catch (OutOfMemoryError ex) {
            System.out.println("Expected: " + ex);
        }
    }

    @Test
    public void OOM2() {
        try {
            new StringJoiner(HALF_MAX_LATIN1_STRING)
                .add("")
                .add(OVERFLOW_UTF16_STRING)
                .toString();
            fail("Should have thrown OutOfMemoryError");
        } catch (OutOfMemoryError ex) {
            System.out.println("Expected: " + ex);
        }
    }

    @Test
    public void OOM3() {
        try {
            new StringJoiner(OVERFLOW_UTF16_STRING)
                .add("")
                .add(HALF_MAX_LATIN1_STRING)
                .toString();
            fail("Should have thrown OutOfMemoryError");
        } catch (OutOfMemoryError ex) {
            System.out.println("Expected: " + ex);
        }
    }

    @Test
    public void OOM4() {
        try {
            new StringJoiner("", HALF_MAX_LATIN1_STRING, OVERFLOW_UTF16_STRING)
                .toString();
            fail("Should have thrown OutOfMemoryError");
        } catch (OutOfMemoryError ex) {
            System.out.println("Expected: " + ex);
        }
    }
}