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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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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.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/jdk/java/lang/String/concat/HiddenClassUnloading.java Normal file
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/*
* Copyright (c) 2024, Alibaba Group Holding Limited. 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.
*/
import java.lang.StringBuilder;
import java.lang.invoke.*;
import java.lang.management.ManagementFactory;
import jdk.test.whitebox.WhiteBox;
/**
* @test
* @summary Test whether the hidden class unloading of StringConcatFactory works
*
* @library /test/lib
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @requires vm.flagless
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
* -Xverify:all HiddenClassUnloading
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
* -Xverify:all -XX:-CompactStrings HiddenClassUnloading
*/
public class HiddenClassUnloading {
public static void main(String[] args) throws Throwable {
var lookup = MethodHandles.lookup();
var types = new Class<?>[] {
int.class, long.class, double.class, float.class, char.class, boolean.class, String.class,
};
long initUnloadedClassCount = ManagementFactory.getClassLoadingMXBean().getUnloadedClassCount();
for (int i = 0; i < 2000; i++) {
int radix = types.length;
String str = Integer.toString(i, radix);
int length = str.length();
var ptypes = new Class[length];
for (int j = 0; j < length; j++) {
int index = Integer.parseInt(str.substring(j, j + 1), radix);
ptypes[j] = types[index];
}
StringConcatFactory.makeConcatWithConstants(
lookup,
"concat",
MethodType.methodType(String.class, ptypes),
"\1".repeat(length), // recipe
new Object[0]
);
}
// Request GC which performs class unloading
WhiteBox.getWhiteBox().fullGC();
long unloadedClassCount = ManagementFactory.getClassLoadingMXBean().getUnloadedClassCount();
if (initUnloadedClassCount == unloadedClassCount) {
throw new RuntimeException("unloadedClassCount is zero");
}
}
}