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 * @modules java.base/jdk.internal.misc 28 * @library /test/lib 29 * @build sun.hotspot.WhiteBox 30 * @run main ClassFileInstaller sun.hotspot.WhiteBox 31 * sun.hotspot.WhiteBox$WhiteBoxPermission 32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI SanityTest 33 */ 34 35 import java.util.*; 36 import sun.hotspot.WhiteBox; 37 38 39 public class SanityTest { 40 public static Object tmp; 41 public static void main(String... args) { 42 43 WhiteBox wb = WhiteBox.getWhiteBox(); 44 StringBuilder sb = new StringBuilder(); 45 sb.append("1234x"); sb.append("x56789"); 46 String str = sb.toString(); 47 48 if (wb.isInStringTable(str)) { 49 throw new RuntimeException("String " + str + " is already interned"); 50 } 51 str.intern(); 52 if (!wb.isInStringTable(str)) { 53 throw new RuntimeException("String " + str + " is not interned"); 54 } 55 str = sb.toString(); 56 wb.fullGC(); 57 if (wb.isInStringTable(str)) { 58 throw new RuntimeException("String " + str + " is in StringTable even after GC"); 59 } 60 } 61 }