1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 7194897
  27  * @summary JSR 292: Cannot create more than 16 instances of an anonymous class
  28  * @modules java.base/sun.misc
  29  * @modules java.management
  30  * @library /lib/testlibrary
  31  * @author  Robert Field
  32  * @compile -XDignore.symbol.file ManyNewInstanceAnonTest.java
  33  * @build jdk.testlibrary.*
  34  * @run main ClassFileInstaller ManyNewInstanceAnonTest
  35  * @run main/othervm -Xbootclasspath/a:. -Xverify:all ManyNewInstanceAnonTest
  36  * @run main/othervm -Xbootclasspath/a:. -Xverify:all -Dsun.reflection.noInflation=true ManyNewInstanceAnonTest
  37  */
  38 import java.io.ByteArrayOutputStream;
  39 import java.io.InputStream;
  40 import sun.misc.Unsafe;
  41 
  42 public class ManyNewInstanceAnonTest {
  43 
  44     static final int REPS = 20;
  45     static final Class<?> klass = ManyNewInstanceAnonTest.class;
  46 
  47     public static void main(String[] args) throws Exception {
  48         Class<?> c = Unsafe.getUnsafe().defineAnonymousClass(klass, readClassFile(), null);
  49         for (int i = 0; i < REPS; ++i) {
  50             System.out.printf("%d: %s\n", i, c.newInstance());
  51         }
  52         System.out.println("Passed.");
  53     }
  54 
  55     private static byte[] readClassFile() throws Exception {
  56         try (InputStream in = klass.getResourceAsStream(klass.getSimpleName() + ".class");
  57              ByteArrayOutputStream out = new ByteArrayOutputStream())
  58         {
  59             int b;
  60             while ((b = in.read()) != -1) {
  61                 out.write(b);
  62             }
  63             return out.toByteArray();
  64         }
  65     }
  66 }