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