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

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.
2026-03-26 17:11:57 -04:00 · 2026-03-26 17:11:57 -04:00 · 0a580b313d
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
--- a/test/jdk/java/util/Locale/ProviderPoolMultiThreadAccess.java
+++ b/test/jdk/java/util/Locale/ProviderPoolMultiThreadAccess.java
@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2010, 2023, 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 6989440
+ * @summary Verify ConcurrentModificationException is not thrown with multiple
+ *     thread accesses.
+ * @modules java.base/sun.util.locale.provider
+ * @compile -XDignore.symbol.file=true ProviderPoolMultiThreadAccess.java
+ * @run junit ProviderPoolMultiThreadAccess
+ */
+import java.text.spi.DateFormatProvider;
+import java.util.spi.LocaleNameProvider;
+import java.util.spi.LocaleServiceProvider;
+import java.util.spi.TimeZoneNameProvider;
+
+import sun.util.locale.provider.LocaleServiceProviderPool;
+
+import org.junit.jupiter.api.Test;
+
+public class ProviderPoolMultiThreadAccess {
+    static volatile boolean failed;  // false
+    static final int THREADS = 50;
+
+    /* Multiple instances of Locale Service Provider Pool calling
+     * getAvailableLocales() should not throw ConcurrentModificationException
+     */
+    @Test
+    public void multiThreadAccessTest() throws Exception {
+        Thread[] threads = new Thread[THREADS];
+        for (int i=0; i<threads.length; i++)
+            threads[i] = new TestThread();
+        for (int i=0; i<threads.length; i++)
+            threads[i].start();
+        for (int i=0; i<threads.length; i++)
+            threads[i].join();
+
+        if (failed)
+            throw new RuntimeException("Failed: check output");
+    }
+
+    static class TestThread extends Thread {
+        private Class<? extends LocaleServiceProvider> cls;
+        private static int count;
+
+        public TestThread() {
+            int which = count++ % 3;
+            switch (which) {
+                case 0 -> cls = LocaleNameProvider.class;
+                case 1 -> cls = TimeZoneNameProvider.class;
+                case 2 -> cls = DateFormatProvider.class;
+                default -> throw new AssertionError("Should not reach here");
+            }
+        }
+
+        public void run() {
+            try {
+                LocaleServiceProviderPool pool = LocaleServiceProviderPool.getPool(cls);
+                pool.getAvailableLocales();
+            } catch (Exception e) {
+                System.out.println(e);
+                e.printStackTrace();
+                failed = true;
+            }
+        }
+    }
+}