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.

test/jdk/java/lang/Class/NullBehaviorTest.java

@@ -0,0 +1,65 @@
+/*
+ * 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 8371953
+ * @summary Check null argument behaviors for java.lang.Class APIs.
+ * @run junit NullBehaviorTest
+ */
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class NullBehaviorTest {
+    @Test
+    void nullChecks() {
+        assertThrows(NullPointerException.class, () -> Class.forName(null));
+        assertDoesNotThrow(() -> Class.forName("java.lang.Object", false, null));
+        assertThrows(NullPointerException.class, () -> Class.forName(null, false, null));
+        assertThrows(NullPointerException.class, () -> Class.forName(null, "java.lang.Object"));
+        assertThrows(NullPointerException.class, () -> Class.forName(Object.class.getModule(), null));
+        assertThrows(NullPointerException.class, () -> Class.forPrimitiveName(null));
+        assertFalse(Object.class.isInstance(null));
+        assertThrows(NullPointerException.class, () -> Object.class.isAssignableFrom(null));
+        assertThrows(NullPointerException.class, () -> Object.class.getField(null));
+        assertThrows(NullPointerException.class, () -> Object.class.getDeclaredField(null));
+        assertThrows(NullPointerException.class, () -> Object.class.getMethod(null));
+        assertThrows(NullPointerException.class, () -> Object.class.getDeclaredMethod(null));
+        assertDoesNotThrow(() -> Object.class.getMethod("hashCode", (Class<?>[]) null));
+        assertDoesNotThrow(() -> Object.class.getDeclaredMethod("hashCode", (Class<?>[]) null));
+        assertThrows(NoSuchMethodException.class, () -> Object.class.getMethod("hashCode", new Class[]{null}));
+        assertThrows(NoSuchMethodException.class, () -> Object.class.getDeclaredMethod("hashCode", new Class[]{null}));
+        assertDoesNotThrow(() -> Object.class.getConstructor((Class<?>[]) null));
+        assertDoesNotThrow(() -> Object.class.getDeclaredConstructor((Class<?>[]) null));
+        assertThrows(NoSuchMethodException.class, () -> Object.class.getConstructor(new Class[]{null}));
+        assertThrows(NoSuchMethodException.class, () -> Object.class.getDeclaredConstructor(new Class[]{null}));
+        assertThrows(NullPointerException.class, () -> Object.class.getResourceAsStream(null));
+        assertThrows(NullPointerException.class, () -> Object.class.getResource(null));
+        assertDoesNotThrow(() -> Object.class.cast(null));
+        assertThrows(NullPointerException.class, () -> Object.class.asSubclass(null));
+        assertThrows(NullPointerException.class, () -> Object.class.isNestmateOf(null));
+        assertThrows(NullPointerException.class, () -> int.class.isNestmateOf(null));
+    }
+}