1 /*
   2  * Copyright (c) 2013, 2014, 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 SanityTest
  26  * @summary Sanity check of String.intern() & GC
  27  * @library /testlibrary /../../test/lib
  28  * @build SanityTest
  29  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  30  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  31  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI SanityTest
  32  */
  33 
  34 import java.util.*;
  35 import sun.hotspot.WhiteBox;
  36 
  37 
  38 public class SanityTest {
  39     public static Object tmp;
  40     public static void main(String... args) {
  41 
  42         WhiteBox wb = WhiteBox.getWhiteBox();
  43         StringBuilder sb = new StringBuilder();
  44         sb.append("1234x"); sb.append("x56789");
  45         String str = sb.toString();
  46 
  47         if (wb.isInStringTable(str)) {
  48             throw new RuntimeException("String " + str + " is already interned");
  49         }
  50         str.intern();
  51         if (!wb.isInStringTable(str)) {
  52             throw new RuntimeException("String " + str + " is not interned");
  53         }
  54         str = sb.toString();
  55         wb.fullGC();
  56         if (wb.isInStringTable(str)) {
  57             throw new RuntimeException("String " + str + " is in StringTable even after GC");
  58         }
  59     }
  60 }