1 /*
   2  * Copyright 2014 SAP AG.  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 public class RecursiveObjectLock {
  25 
  26     public ALock lightLock = new ALock();
  27 
  28 
  29     public void testMethod() {
  30         ALock lock = lightLock;
  31         synchronized (lock) {
  32             nestedLock1(lock);
  33         }
  34     }
  35 
  36     public void nestedLock1(ALock lock) {
  37         synchronized (lock) {
  38             nestedLock2(lock);
  39         }
  40     }
  41 
  42     public void nestedLock2(ALock lock) {
  43         synchronized (lock) {
  44             callWait(lock);
  45         }
  46     }
  47 
  48     public void callWait(ALock lock){
  49         try {
  50             lock.wait(1);
  51         } catch (InterruptedException e) {
  52 
  53             e.printStackTrace();
  54         }
  55         breakpoint1();
  56     }
  57 
  58     public static void breakpoint1() {
  59         // purpose: hold a breakpoint
  60     }
  61 
  62     public static void main(String[] args) {
  63         RecursiveObjectLock ro = new RecursiveObjectLock();
  64         ro.testMethod();
  65         System.out.println("ready");
  66     }
  67 
  68     static class ALock {
  69         // rather use this type for locking tests, because Object could be excluded from biased locking
  70     }
  71 }