1 /* 2 * Copyright (c) 2014 Google Inc. 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 * @ignore This test has huge memory requirements 27 * @run main/timeout=1800/othervm -Xmx8g MaxCapacity 28 * @bug 8055949 29 * @summary Check that we can write (almost) Integer.MAX_VALUE bytes 30 * to a ByteArrayOutputStream. 31 * @author Martin Buchholz 32 */ 33 import java.io.ByteArrayOutputStream; 34 35 public class MaxCapacity { 36 public static void main(String[] args) { 37 long maxHeap = Runtime.getRuntime().maxMemory(); 38 if (maxHeap < 3L * Integer.MAX_VALUE) { 39 System.out.printf("Skipping test; max memory %sM too small%n", 40 maxHeap/(1024*1024)); 41 return; 42 } 43 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 44 for (long n = 0; ; n++) { 45 try { 46 baos.write((byte)'x'); 47 } catch (Throwable t) { 48 // check data integrity while we're here 49 byte[] bytes = baos.toByteArray(); 50 if (bytes.length != n) 51 throw new AssertionError("wrong length"); 52 if (bytes[0] != 'x' || 53 bytes[bytes.length - 1] != 'x') 54 throw new AssertionError("wrong contents"); 55 56 long gap = Integer.MAX_VALUE - n; 57 System.out.printf("gap=%dM %d%n", gap/(1024*1024), gap); 58 if (gap > 1024) 59 throw t; 60 // t.printStackTrace(); 61 break; 62 } 63 } 64 } 65 }