1 /*
2 * Copyright (c) 2004, 2013, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.tools.jps;
27
28 import java.util.*;
29 import java.net.*;
30 import sun.jvmstat.monitor.*;
31
32 /**
33 * Application to provide a listing of monitorable java processes.
34 *
35 * @author Brian Doherty
36 * @since 1.5
37 */
38 public class Jps {
39
40 private static Arguments arguments;
41
42 public static void main(String[] args) {
43 try {
44 arguments = new Arguments(args);
45 } catch (IllegalArgumentException e) {
46 System.err.println(e.getMessage());
47 Arguments.printUsage(System.err);
48 System.exit(1);
49 }
50
51 if (arguments.isHelp()) {
52 Arguments.printUsage(System.err);
53 System.exit(0);
54 }
55
56 try {
57 HostIdentifier hostId = arguments.hostId();
58 MonitoredHost monitoredHost =
59 MonitoredHost.getMonitoredHost(hostId);
60
61 // get the set active JVMs on the specified host.
62 Set<Integer> jvms = monitoredHost.activeVms();
63
64 for (Integer jvm: jvms) {
65 StringBuilder output = new StringBuilder();
66 Throwable lastError = null;
67
68 int lvmid = jvm;
69
70 output.append(String.valueOf(lvmid));
71
72 if (arguments.isQuiet()) {
73 System.out.println(output);
74 continue;
75 }
76
77 MonitoredVm vm = null;
78 String vmidString = "//" + lvmid + "?mode=r";
79
80 String errorString = null;
81
82 try {
83 // Note: The VM associated with the current VM id may
84 // no longer be running so these queries may fail. We
85 // already added the VM id to the output stream above.
86 // If one of the queries fails, then we try to add a
87 // reasonable message to indicate that the requested
88 // info is not available.
89
90 errorString = " -- process information unavailable";
91 VmIdentifier id = new VmIdentifier(vmidString);
92 vm = monitoredHost.getMonitoredVm(id, 0);
93
94 errorString = " -- main class information unavailable";
95 output.append(" " + MonitoredVmUtil.mainClass(vm,
96 arguments.showLongPaths()));
97
98 if (arguments.showMainArgs()) {
99 errorString = " -- main args information unavailable";
100 String mainArgs = MonitoredVmUtil.mainArgs(vm);
101 if (mainArgs != null && mainArgs.length() > 0) {
102 output.append(" " + mainArgs);
103 }
104 }
105 if (arguments.showVmArgs()) {
106 errorString = " -- jvm args information unavailable";
107 String jvmArgs = MonitoredVmUtil.jvmArgs(vm);
108 if (jvmArgs != null && jvmArgs.length() > 0) {
109 output.append(" " + jvmArgs);
110 }
111 }
112 if (arguments.showVmFlags()) {
113 errorString = " -- jvm flags information unavailable";
114 String jvmFlags = MonitoredVmUtil.jvmFlags(vm);
115 if (jvmFlags != null && jvmFlags.length() > 0) {
116 output.append(" " + jvmFlags);
117 }
118 }
119
120 errorString = " -- detach failed";
121 monitoredHost.detach(vm);
122
123 System.out.println(output);
124
125 errorString = null;
126 } catch (URISyntaxException e) {
127 // unexpected as vmidString is based on a validated hostid
128 lastError = e;
129 assert false;
130 } catch (Exception e) {
131 lastError = e;
132 } finally {
133 if (errorString != null) {
134 /*
135 * we ignore most exceptions, as there are race
136 * conditions where a JVM in 'jvms' may terminate
137 * before we get a chance to list its information.
138 * Other errors, such as access and I/O exceptions
139 * should stop us from iterating over the complete set.
140 */
141 output.append(errorString);
142 if (arguments.isDebug()) {
143 if ((lastError != null)
144 && (lastError.getMessage() != null)) {
145 output.append("\n\t");
146 output.append(lastError.getMessage());
147 }
148 }
149 System.out.println(output);
150 if (arguments.printStackTrace()) {
151 lastError.printStackTrace();
152 }
153 continue;
154 }
155 }
156 }
157 } catch (MonitorException e) {
158 if (e.getMessage() != null) {
159 System.err.println(e.getMessage());
160 } else {
161 Throwable cause = e.getCause();
162 if ((cause != null) && (cause.getMessage() != null)) {
163 System.err.println(cause.getMessage());
164 } else {
165 e.printStackTrace();
166 }
167 }
168 System.exit(1);
169 }
170 }
171 }