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/*
* Copyright (c) 2025, 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 8356152
* @summary Check that huge concatenations throw OutOfMemoryError
* @requires os.maxMemory > 8G
* @run junit/othervm -Xmx8G -XX:+CompactStrings -Dcompact=true HugeConcatTest
* @run junit/othervm -Xmx8G -XX:-CompactStrings -Dcompact=false HugeConcatTest
*/
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import static org.junit.Assert.assertThrows;
public class HugeConcatTest {
private static final int HUGE_LENGTH_UTF16 = Integer.MAX_VALUE / 2 - 2;
private static String hugeLatin1;
private static final String hugeUTF16 = "\u20AC".repeat(HUGE_LENGTH_UTF16);
@BeforeAll
public static void initHugeLatin1() {
String compact = System.getProperty("compact", "true");
int hugeLatin1Length = Boolean.parseBoolean(compact)
? Integer.MAX_VALUE - 2
: HUGE_LENGTH_UTF16;
hugeLatin1 = "a".repeat(hugeLatin1Length);
}
@Test
public void testConcat_Latin1_Latin1() {
assertThrows(OutOfMemoryError.class, () -> { var s = hugeLatin1 + hugeLatin1; });
assertThrows(OutOfMemoryError.class, () -> hugeLatin1.concat(hugeLatin1));
}
@Test
public void testConcat_Latin1_UTF16() {
assertThrows(OutOfMemoryError.class, () -> { var s = hugeLatin1 + hugeUTF16; });
assertThrows(OutOfMemoryError.class, () -> hugeLatin1.concat(hugeUTF16));
}
@Test
public void testConcat_UTF16_Latin1() {
assertThrows(OutOfMemoryError.class, () -> { var s = hugeUTF16 + hugeLatin1; });
assertThrows(OutOfMemoryError.class, () -> hugeUTF16.concat(hugeLatin1));
}
@Test
public void testConcat_UTF16_UTF16() {
assertThrows(OutOfMemoryError.class, () -> { var s = hugeUTF16 + hugeUTF16; });
assertThrows(OutOfMemoryError.class, () -> hugeUTF16.concat(hugeUTF16));
}
}
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