table of contents
| jcmd(1) | General Commands Manual | jcmd(1) |
Name¶
jcmd - Sends diagnostic command requests to a running Java Virtual Machine
SYNOPSIS¶
jcmd [ options ] jcmd [ pid | main-class ] PerfCounter.print jcmd [ pid | main-class ] command [arguments] jcmd [ pid | main-class ] -f file
- options
- The command-line options. See Options.
- pid
- Identifies the process that receives the diagnostic command requests. The process must be a Java process. To get a list of Java processes running on a machine, use jps(1) or jcmd(1).
- main-class
- The main class of the process that receives the diagnostic command requests. When matching processes, any process whose main class name contains the specified string as a substring is matched. If several running Java processes share the same main class, then the diagnostic command request is sent to all these processes. To get a list of Java processes running on a machine, use jps(1) or jcmd(1).
- command [arguments]
- The main class of the process that receives the diagnostic command requests. When matching processes, any process whose main class name contains the specified string as a substring is matched. If several running Java processes share the same main class, then the diagnostic command request is sent to all these processes. To get a list of Java processes running on a machine, use jps(1) or jcmd(1).
- Perfcounter.print
- Print the performance counters available on the targeted Java processes. The list of performance counters might vary with the Java process.
- -f file
- Read commands from file and call them on the targeted Java processes. In file, each command must be written on a single line. Lines starting with # are ignored. Processing of file ends when all lines have been called or when a line containing the stop keyword is read.
DESCRIPTION¶
jcmd is a utility to send diagnostic command requests to a Java Virtual Machine supporting this feature.
Used without arguments or with the -l option, jcmd prints the list of running Java processes with their process ID, their main class and their command-line arguments.
When a process ID is specified on the command line, jcmd sends the diagnostic command request to the process with this ID.
When a main class is specified on the command line, jcmd sends the diagnostic command request to all Java processes for which the command-line argument is a substring of the Java process' main class.
With the PerfCounter.print argument, jcmd prints the performance counters available on the targeted Java processes.
With the -f option, jcmd sends to the targeted Java processes the diagnostic commands stored in the specified file.
OPTIONS¶
Options are mutually exclusive. Options, when used, must immediately follow the command name.
SEE ALSO¶
- o
- jps
| 18 Jul 2013 |