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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
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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.
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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 
main(String[] args)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 }
172