1 /*

     2  * Copyright (c) 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 /* @test

    25  * @bug 7011804

    26  * @summary SequenceInputStream#read() was implemented recursivly,

    27  *          which may cause stack overflow

    28  */

    29 

    30 import java.io.ByteArrayInputStream;

    31 import java.io.InputStream;

    32 import java.io.SequenceInputStream;

    33 import java.util.Enumeration;

    34 

    35 public class LotsOfStreams {

    36 

    37     static final int MAX_SUBSTREAMS = 32000;

    38 

    39     public static void main(String[] argv) throws Exception {

    40         try (InputStream stream =

    41                 new SequenceInputStream(new LOSEnumeration())) {

    42             stream.read();

    43         }

    44         try (InputStream stream =

    45                 new SequenceInputStream(new LOSEnumeration())) {

    46             byte[] b = new byte[1];

    47             stream.read(b, 0, 1);

    48         }

    49     }

    50 

    51     static class LOSEnumeration

    52             implements Enumeration<InputStream> {

    53 

    54         private static InputStream inputStream =

    55                 new ByteArrayInputStream(new byte[0]);

    56         private int left = MAX_SUBSTREAMS;

    57 

    58         public boolean hasMoreElements() {

    59             return (left > 0);

    60         }

    61         public InputStream nextElement() {

    62             left--;

    63             return inputStream;

    64         }

    65     }

    66 }