1 /* 2 * Copyright (c) 2016, 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 26 * @bug 8146851 27 * @summary Test exception depths, and code to get stack traces 28 * @library /testlibrary 29 * @run main/othervm -XX:MaxJavaStackTraceDepth=1024 TestThrowable 30 */ 31 32 import java.lang.reflect.Method; 33 import jdk.test.lib.Asserts; 34 35 public class TestThrowable { 36 37 // Inner class that throws a lot of exceptions 38 static class Thrower { 39 static int MaxJavaStackTraceDepth = 1024; // as above 40 int[] depths = {10, 34, 100, 1024, 2042}; 41 int count = 0; 42 43 int getDepth(Throwable t) throws Exception { 44 for (Method m : Throwable.class.getDeclaredMethods()) { 45 if (m.getName().equals("getStackTraceDepth")) { 46 m.setAccessible(true); // it's private 47 return (int)m.invoke(t); 48 } 49 } 50 return 0; 51 } 52 53 void callThrow(int depth) { 54 if (++count < depth) { 55 callThrow(depth); 56 } else { 57 throw new RuntimeException("depth tested " + depth); 58 } 59 } 60 void testThrow() throws Exception { 61 for (int d : depths) { 62 try { 63 count = getDepth(new Throwable()); 64 callThrow(d); 65 } catch(Exception e) { 66 e.getStackTrace(); 67 System.out.println(e.getMessage()); 68 int throwableDepth = getDepth(e); 69 Asserts.assertTrue(throwableDepth == d || 70 (d > MaxJavaStackTraceDepth && throwableDepth == MaxJavaStackTraceDepth), 71 "depth should return the correct value: depth tested=" + 72 d + " throwableDepth=" + throwableDepth); 73 } 74 } 75 } 76 } 77 78 public static void main(java.lang.String[] unused) throws Exception { 79 Thrower t = new Thrower(); 80 t.testThrow(); 81 } 82 }