1/* 2 * Copyright (c) 2005, 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 * Thread Dump utility class for printing 26 * @author Mandy Chung 27 */ 28 29import java.lang.management.*; 30import java.util.*; 31 32public class ThreadDump { 33 private static final String INDENT = " "; 34 35 public static void printThreadInfo(ThreadInfo ti) { 36 StringBuilder sb = new StringBuilder("\"" + ti.getThreadName() + "\"" + 37 (ti.isDaemon() ? " daemon" : "") + 38 " Id=" + ti.getThreadId() + 39 " in " + ti.getThreadState()); 40 if (ti.getLockName() != null) { 41 sb.append(" on lock=" + ti.getLockName()); 42 } 43 if (ti.isSuspended()) { 44 sb.append(" (suspended)"); 45 } 46 if (ti.isInNative()) { 47 sb.append(" (running in native)"); 48 } 49 System.out.println(sb.toString()); 50 if (ti.getLockOwnerName() != null) { 51 System.out.println(INDENT + " owned by " + ti.getLockOwnerName() + 52 " Id=" + ti.getLockOwnerId()); 53 } 54 StackTraceElement[] stacktrace = ti.getStackTrace(); 55 MonitorInfo[] monitors = ti.getLockedMonitors(); 56 for (int i = 0; i < stacktrace.length; i++) { 57 StackTraceElement ste = stacktrace[i]; 58 System.out.println(INDENT + "at " + ste.toString()); 59 60 for (MonitorInfo mi : monitors) { 61 if (mi.getLockedStackDepth() == i) { 62 System.out.println(INDENT + " - locked " + mi); 63 } 64 } 65 } 66 System.out.println(); 67 } 68 69 public static void printStack(StackTraceElement[] stack) { 70 System.out.println(INDENT + "Stack: (length = " + stack.length + ")"); 71 for (int j = 0; j < stack.length; j++) { 72 System.out.println(INDENT + INDENT + stack[j]); 73 } 74 System.out.println(); 75 } 76 77 public static void dumpStacks() { 78 // Get stack traces of all Threads 79 Map m = Thread.getAllStackTraces(); 80 Set s = m.entrySet(); 81 Iterator iter = s.iterator(); 82 83 Map.Entry entry; 84 while (iter.hasNext()) { 85 entry = (Map.Entry) iter.next(); 86 Thread t = (Thread) entry.getKey(); 87 StackTraceElement[] stack = (StackTraceElement[]) entry.getValue(); 88 System.out.println(t); 89 printStack(stack); 90 } 91 } 92 93 public static void printLockInfo(LockInfo[] locks) { 94 System.out.println(INDENT + "Locked synchronizers: count = " + locks.length); 95 for (LockInfo li : locks) { 96 System.out.println(INDENT + " - " + li); 97 } 98 } 99 100 static ThreadMXBean tmbean = ManagementFactory.getThreadMXBean(); 101 public static void threadDump() { 102 System.out.println("Full Java thread dump"); 103 ThreadInfo[] tinfos = tmbean.dumpAllThreads(true, true); 104 for (ThreadInfo ti : tinfos) { 105 printThreadInfo(ti); 106 LockInfo[] syncs = ti.getLockedSynchronizers(); 107 printLockInfo(syncs); 108 System.out.println(); 109 } 110 } 111 112} 113