6874407: Missing regression test for 6636650

Summary: Prevent classloader from resurrection
Reviewed-by: hawtin

test/java/lang/ClassLoader/UninitializedParent.java

+/*
+ * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 6636650
+ * @summary Uninitialized class loaders should not be a parent of other
+ *          class loaders.
+ */
+
+
+import java.net.*;
+
+public class UninitializedParent {
+    private static ClassLoader loader;
+    public static void main(String[] args) throws Exception {
+        System.setSecurityManager(new SecurityManager());
+
+        // Create an uninitialized class loader
+        try {
+            new ClassLoader(null) {
+                @Override
+                protected void finalize() {
+                    loader = this;
+                }
+            };
+        } catch (SecurityException exc) {
+            // Expected
+        }
+        System.gc();
+        System.runFinalization();
+
+        // if 'loader' isn't null, need to ensure that it can't be used as
+        // parent
+        if (loader != null) {
+            try {
+                // Create a class loader with 'loader' being the parent
+                URLClassLoader child = URLClassLoader.newInstance
+                    (new URL[0], loader);
+                throw new RuntimeException("Test Failed!");
+            } catch (SecurityException se) {
+                System.out.println("Test Passed: Exception thrown");
+            }
+        } else {
+            System.out.println("Test Passed: Loader is null");
+        }
+    }
+}