1 files changed, 123 insertions, 0 deletions
diff --git a/test/java/lang/ClassLoader/forNameLeak/ClassForNameLeak.java b/test/java/lang/ClassLoader/forNameLeak/ClassForNameLeak.java
new file mode 100644
index 0000000000..d243103bd4
--- /dev/null
+++ b/test/java/lang/ClassLoader/forNameLeak/ClassForNameLeak.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2016, 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 8151486
+ * @summary Call Class.forName() on the system classloader from a class loaded
+ *          from a custom classloader.
+ * @library /lib/testlibrary
+ * @build jdk.testlibrary.Utils jdk.testlibrary.JarUtils
+ * @build ClassForName ClassForNameLeak
+ * @run main/othervm/policy=test.policy -Djava.security.manager ClassForNameLeak
+ */
+
+import java.lang.ref.PhantomReference;
+import java.lang.ref.Reference;
+import java.lang.ref.ReferenceQueue;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import jdk.testlibrary.Utils;
+import jdk.testlibrary.JarUtils;
+
+/*
+ * Create .jar, load ClassForName from .jar using a URLClassLoader
+ */
+public class ClassForNameLeak {
+    private static final long TIMEOUT = (long)(5000.0 * Utils.TIMEOUT_FACTOR);
+    private static final String TESTCLASSES = System.getProperty("test.classes", ".");
+    private static final String CLASSFILENAME = "ClassForName.class";
+    private static final int THREADS = 10;
+    private static final ReferenceQueue<ClassLoader> rq = new ReferenceQueue<>();
+
+    // Use a new classloader to load the ClassForName class, then run its
+    // Runnable.
+    public static PhantomReference<ClassLoader> loadAndRun(Path jarFilePath)
+            throws Exception {
+        ClassLoader classLoader = new URLClassLoader(
+                new URL[]{jarFilePath.toUri().toURL()}) {
+            @Override public String toString() { return "LeakedClassLoader"; }
+        };
+
+        Class<?> loadClass = Class.forName("ClassForName", true, classLoader);
+        ((Runnable) loadClass.newInstance()).run();
+
+        PhantomReference<ClassLoader> ref = new PhantomReference<>(classLoader, rq);
+        System.out.println("returning phantom ref: " + ref + " to " + classLoader);
+        return ref;
+    }
+
+    public static void main(final String[] args) throws Exception {
+        Path classFile = FileSystems.getDefault().getPath(TESTCLASSES,
+                                                          CLASSFILENAME);
+
+        // Create a temporary .jar file containing ClassForName.class
+        Path testClassesDir = Paths.get(TESTCLASSES);
+        Path jarFilePath = Files.createTempFile("cfn", ".jar");
+        JarUtils.createJarFile(jarFilePath, testClassesDir, classFile);
+        jarFilePath.toFile().deleteOnExit();
+
+        // Remove the ClassForName.class file that jtreg built, to make sure
+        // we're loading from the tmp .jar
+        Files.delete(classFile);
+
+        // Make simultaneous calls to the test method, to stress things a bit
+        ExecutorService es = Executors.newFixedThreadPool(THREADS);
+
+        List<Callable<PhantomReference<ClassLoader>>> callables =
+                Stream.generate(() -> {
+                    Callable<PhantomReference<ClassLoader>> cprcl = () -> {
+                        return loadAndRun(jarFilePath);
+                    };
+                    return cprcl;
+                }).limit(THREADS).collect(Collectors.toList());
+
+        List<Future<PhantomReference<ClassLoader>>> refs = es.invokeAll(callables);
+
+        // Give the GC a chance to enqueue the PhantomReferences
+        for (int i = 0; i < 10; i++) {
+            System.gc();
+        }
+        // Make sure all PhantomReferences to the leaked classloader are enqueued
+        for (int j = 0; j < THREADS; j++) {
+            Reference rmRef = rq.remove(TIMEOUT);
+            if (rmRef == null) {
+                throw new RuntimeException("ClassLoader was never enqueued!");
+            } else {
+                System.out.println("Enqueued " + rmRef);
+            }
+        }
+        System.out.println("All Classloaders successfully enqued");
+    }
+}