J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004-2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * |
| 8 | * - Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * - Neither the name of Sun Microsystems nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived |
| 17 | * from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| 20 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 21 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | */ |
| 34 | |
| 35 | import javax.management.*; |
| 36 | import javax.management.remote.*; |
| 37 | import java.io.IOException; |
| 38 | import java.net.MalformedURLException; |
| 39 | |
| 40 | /** |
| 41 | * This FullThreadDump class demonstrates the capability to get |
| 42 | * a full thread dump and also detect deadlock remotely. |
| 43 | */ |
| 44 | public class FullThreadDump { |
| 45 | private MBeanServerConnection server; |
| 46 | private JMXConnector jmxc; |
| 47 | public FullThreadDump(String hostname, int port) { |
| 48 | System.out.println("Connecting to " + hostname + ":" + port); |
| 49 | |
| 50 | // Create an RMI connector client and connect it to |
| 51 | // the RMI connector server |
| 52 | String urlPath = "/jndi/rmi://" + hostname + ":" + port + "/jmxrmi"; |
| 53 | connect(urlPath); |
| 54 | } |
| 55 | |
| 56 | public void dump() { |
| 57 | try { |
| 58 | ThreadMonitor monitor = new ThreadMonitor(server); |
| 59 | monitor.threadDump(); |
| 60 | if (!monitor.findDeadlock()) { |
| 61 | System.out.println("No deadlock found."); |
| 62 | } |
| 63 | } catch (IOException e) { |
| 64 | System.err.println("\nCommunication error: " + e.getMessage()); |
| 65 | System.exit(1); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Connect to a JMX agent of a given URL. |
| 71 | */ |
| 72 | private void connect(String urlPath) { |
| 73 | try { |
| 74 | JMXServiceURL url = new JMXServiceURL("rmi", "", 0, urlPath); |
| 75 | this.jmxc = JMXConnectorFactory.connect(url); |
| 76 | this.server = jmxc.getMBeanServerConnection(); |
| 77 | } catch (MalformedURLException e) { |
| 78 | // should not reach here |
| 79 | } catch (IOException e) { |
| 80 | System.err.println("\nCommunication error: " + e.getMessage()); |
| 81 | System.exit(1); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | public static void main(String[] args) { |
| 86 | if (args.length != 1) { |
| 87 | usage(); |
| 88 | } |
| 89 | |
| 90 | String[] arg2 = args[0].split(":"); |
| 91 | if (arg2.length != 2) { |
| 92 | usage(); |
| 93 | } |
| 94 | String hostname = arg2[0]; |
| 95 | int port = -1; |
| 96 | try { |
| 97 | port = Integer.parseInt(arg2[1]); |
| 98 | } catch (NumberFormatException x) { |
| 99 | usage(); |
| 100 | } |
| 101 | if (port < 0) { |
| 102 | usage(); |
| 103 | } |
| 104 | |
| 105 | // get full thread dump and perform deadlock detection |
| 106 | FullThreadDump ftd = new FullThreadDump(hostname, port); |
| 107 | ftd.dump(); |
| 108 | } |
| 109 | |
| 110 | private static void usage() { |
| 111 | System.out.println("Usage: java FullThreadDump <hostname>:<port>"); |
| 112 | } |
| 113 | } |