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.\"

.\" Title: jcmd

.\" Language: English

.\" Date: 03 March 2015

.\" SectDesc: Troubleshooting Tools

.\" Software: JDK 8

.\" Arch: generic

.\" Part Number: E38207-04

.\" Doc ID: JSSON

.TH "jcmd" "1" "03 March 2015" "JDK 8" "Troubleshooting Tools"

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.\" * Define some portability stuff

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.\" * MAIN CONTENT STARTS HERE *

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.SH "NAME"

.SH "SYNOPSIS"

.sp

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.SH "DESCRIPTION"

The

\fBjcmd\fR

utility is used to send diagnostic command requests to the JVM\&. It must be used on the same machine on which the JVM is running, and have the same effective user and group identifiers that were used to launch the JVM\&.

.if n \{\

.sp

.\}

.RS 4

.it 1 an-trap

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\fBNote\fR

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.TS

allbox tab(:);

l.

T{

To invoke diagnostic commands from a remote machine or with different identifiers, you can use the

\fBcom\&.sun\&.management\&.DiagnosticCommandMBean\fR

interface\&. For more information about the

\fBDiagnosticCommandMBean\fR

interface, see the API documentation at http://docs\&.oracle\&.com/javase/8/docs/jre/api/management/extension/com/sun/management/DiagnosticCommandMBean\&.html

T}

.TE

.sp 1

.sp .5v

.RE

.PP

If you run

\fBjcmd\fR

without arguments or with the

\fB\-l\fR

option, it prints the list of running Java process identifiers with the main class and command\-line arguments that were used to launch the process\&. Running

\fBjcmd\fR

with the

\fB\-h\fR

or

\fB\-help\fR

option prints the tool\(cqs help message\&.

.PP

If you specify the processes identifier (\fIpid\fR) or the main class (\fImain\-class\fR) as the first argument,

\fBjcmd\fR

sends the diagnostic command request to the Java process with the specified identifier or to all Java processes with the specified name of the main class\&. You can also send the diagnostic command request to all available Java processes by specifying

\fB0\fR

as the process identifier\&. Use one of the following as the diagnostic command request:

.PP

.RS 4

.RE

.PP

\-f \fIfilename\fR

.RS 4

The name of the file from which to read diagnostic commands and send them to the specified Java process\&. Used only with the

\fB\-f\fR

option\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\fB#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the

\fBstop\fR

keyword is read\&.

.RE

.PP

.RS 4

The command to be sent to the specified Java process\&. The list of available diagnostic commands for a given process can be obtained by sending the

\fBhelp\fR

command to this process\&. Each diagnostic command has its own set of arguments\&. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the

\fBhelp\fR

command\&.

.sp

\fBNote:\fR

If any arguments contain spaces, you must surround them with single or double quotation marks (\fB\*(Aq\fR

or

\fB"\fR)\&. In addition, you must escape single or double quotation marks with a backslash (\fB\e\fR) to prevent the operating system shell from processing quotation marks\&. Alternatively, you can surround these arguments with single quotation marks and then with double quotation marks (or with double quotation marks and then with single quotation marks)\&.

.RE

.SH "OPTIONS"

.PP

.PP

\-f \fIfilename\fR

.RS 4

Reads commands from the specified file\&. This option can be used only if you specify the process identifier or the main class as the first argument\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\fB#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the

\fBstop\fR

keyword is read\&.

.RE

.PP

\-h

\-help

.RS 4

.RE

.PP

\-l

.RS 4

Prints the list of running Java processes identifiers with the main class and command\-line arguments\&.

.RE

.SH "SEE ALSO"

.sp

.RS 4

.ie n \{\

\h'-04'\(bu\h'+03'\c

.\}

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.sp -1

.IP \(bu 2.3

.\}

jps(1)

.RE

'pl 8.5i

'bp