JPS(1) JDK Commands JPS(1)
NAME
jps - list the instrumented JVMs on the target system
SYNOPSIS
Note: This command is experimental and unsupported.
jps [-q] [-mlvV] [hostid]
jps [-help]
OPTIONS
-q Suppresses the output of the class name, JAR file name, and ar-
guments passed to the main method, producing a list of only lo-
cal JVM identifiers.
-mlvV You can specify any combination of these options.
• -m displays the arguments passed to the main method. The out-
put may be null for embedded JVMs.
• -l displays the full package name for the application's main
class or the full path name to the application's JAR file.
• -v displays the arguments passed to the JVM.
• -V suppresses the output of the class name, JAR file name, and
arguments passed to the main method, producing a list of only
local JVM identifiers.
hostid The identifier of the host for which the process report should
be generated. The hostid can include optional components that
indicate the communications protocol, port number, and other im-
plementation specific data. See Host Identifier.
-help Displays the help message for the jps command.
DESCRIPTION
The jps command lists the instrumented Java HotSpot VMs on the target
system. The command is limited to reporting information on JVMs for
which it has the access permissions.
If the jps command is run without specifying a hostid, then it searches
for instrumented JVMs on the local host. If started with a hostid,
then it searches for JVMs on the indicated host, using the specified
protocol and port. A jstatd process is assumed to be running on the
target host.
The jps command reports the local JVM identifier, or lvmid, for each
instrumented JVM found on the target system. The lvmid is typically,
but not necessarily, the operating system's process identifier for the
JVM process. With no options, the jps command lists each Java applica-
tion's lvmid followed by the short form of the application's class name
or jar file name. The short form of the class name or JAR file name
omits the class's package information or the JAR files path informa-
tion.
The jps command uses the Java launcher to find the class name and argu-
ments passed to the main method. If the target JVM is started with a
custom launcher, then the class or JAR file name, and the arguments to
the main method aren't available. In this case, the jps command out-
puts the string Unknown for the class name, or JAR file name, and for
the arguments to the main method.
The list of JVMs produced by the jps command can be limited by the per-
missions granted to the principal running the command. The command
lists only the JVMs for which the principal has access rights as deter-
mined by operating system-specific access control mechanisms.
HOST IDENTIFIER
The host identifier, or hostid, is a string that indicates the target
system. The syntax of the hostid string corresponds to the syntax of a
URI:
[protocol:][[//]hostname][:port][/servername]
protocol
The communications protocol. If the protocol is omitted and a
hostname isn't specified, then the default protocol is a plat-
form-specific, optimized, local protocol. If the protocol is
omitted and a host name is specified, then the default protocol
is rmi.
hostname
A host name or IP address that indicates the target host. If
you omit the hostname parameter, then the target host is the lo-
cal host.
port The default port for communicating with the remote server. If
the hostname parameter is omitted or the protocol parameter
specifies an optimized, local protocol, then the port parameter
is ignored. Otherwise, treatment of the port parameter is im-
plementation-specific. For the default rmi protocol, the port
parameter indicates the port number for the rmiregistry on the
remote host. If the port parameter is omitted, and the protocol
parameter indicates rmi, then the default rmiregistry port
(1099) is used.
servername
The treatment of this parameter depends on the implementation.
For the optimized, local protocol, this field is ignored. For
the rmi protocol, this parameter is a string that represents the
name of the RMI remote object on the remote host. See the js-
tatd command -n option.
OUTPUT FORMAT OF THE JPS COMMAND
The output of the jps command has the following pattern:
lvmid [ [ classname | JARfilename | "Unknown"] [ arg* ] [ jv-
marg* ] ]
All output tokens are separated by white space. An arg value that in-
cludes embedded white space introduces ambiguity when attempting to map
arguments to their actual positional parameters.
Note:
It's recommended that you don't write scripts to parse jps output be-
cause the format might change in future releases. If you write scripts
that parse jps output, then expect to modify them for future releases
of this tool.
EXAMPLES
This section provides examples of the jps command.
List the instrumented JVMs on the local host:
jps
18027 Java2Demo.JAR
18032 jps
18005 jstat
The following example lists the instrumented JVMs on a remote host.
This example assumes that the jstat server and either the its internal
RMI registry or a separate external rmiregistry process are running on
the remote host on the default port (port 1099). It also assumes that
the local host has appropriate permissions to access the remote host.
This example includes the -l option to output the long form of the
class names or JAR file names.
jps -l remote.domain
3002 /opt/jdk1.7.0/demo/jfc/Java2D/Java2Demo.JAR
2857 sun.tools.jstatd.jstatd
The following example lists the instrumented JVMs on a remote host with
a nondefault port for the RMI registry. This example assumes that the
jstatd server, with an internal RMI registry bound to port 2002, is
running on the remote host. This example also uses the -m option to
include the arguments passed to the main method of each of the listed
Java applications.
jps -m remote.domain:2002
3002 /opt/jdk1.7.0/demo/jfc/Java2D/Java2Demo.JAR
3102 sun.tools.jstatd.jstatd -p 2002
JDK 21 2023 JPS(1)
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