NAME
jps - Java Virtual Machine Process Status Tool
SYNOPSIS
jjppss [options] [hostid]DESCRIPTION
The jjppss tool lists the instrumented HotSpot Java Virtual Machines(JVMs) on the target system. The tool is limited to reporting informa-
tion on JVMs for which it has the access permissions.If jjppss is run without specifying a hostid, it will look for instru-
mented JVMs on the local host. If started with a hostid, it will look 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 jjppss command will report the local VM 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, jjppss will list each Java application'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 information.The jjppss 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, the class name (or JAR file name) and the arguments to the main method will not be available. In this case, the jjppss command will output 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 may be limited by the per-
missions granted to the principal running the command. The command willonly list the JVMs for which the principle has access rights as deter-
mined by operating system specific access control mechanisms.NNOOTTEE - This utility is unsupported and may or may not be available in
future versions of the JDK. It is not currently available on Widows 98 and Windows ME platforms. PPAARRAAMMEETTEERRSSoptions Command-line options.
hostid The host identifier of the host for which the process report should be generated. The hostid may include optional components that indicate the communications protocol, port number, and other implementation specific data. OOPPTTIIOONNSS The jjppss command supports a number of options that modify the output of the command. These options are subject to change or removal in the future.-qq Suppress the output of the class name, JAR file name,
and arguments passed to the main method, producing only a list of local VM identifiers.-mm Output the arguments passed to the main method. The out-
put may be null for embedded JVMs.-ll Output the full package name for the application's main
class or the full path name to the application's JAR file.-vv Output the arguments passed to the JVM.
-VV Output the arguments passed to the JVM through the flags
file (the .hotspotrc file or the file specified by the-XX:Flags=
argument). -JJoption Pass option to the java launcher called by javac. For
example, -JJ-XXmmss4488mm sets the startup memory to 48
megabytes. It is a common convention for -JJ to pass
options to the underlying VM executing applications written in Java. HHOOSSTT IIDDEENNTTIIFFIIEERR The host identifier, or hostid is a string that indicates the targetsystem. The syntax of the hostid string largely corresponds to the syn-
tax of a URI: [[pprroottooccooll::]][[[[////]]hhoossttnnaammee]][[::ppoorrtt]][[//sseerrvveerrnnaammee]] pprroottooccooll The communications protocol. If the protocol is omitted and a hostname is not specified, the default protocol is a platform specific, optimized, local protocol. If the protocol is omitted and a hostname is specified, then the default protocol is rmi. hhoossttnnaammee A hostname or IP address indicating the target host. If hostname is omitted, then the target host is the local host. ppoorrtt The default port for communicating with the remoteserver. If the hostname is omitted or the protocol spec-
ifies an optimized, local protocol, then port is ignored. Otherwise, treatment of the port parameter is implementation specific. For the default rmi protocol the port indicates the port number for the rmiregistry on the remote host. If port is omitted, and protocol indicates rmi, then the default rmiregistry port (1099) is used.sseerrvveerrnnaammee The treatment of this parameter depends on the implemen-
tation. For the optimized, local protocol, this field is ignored. For the rmi protocol, this parameter is a string representing the name of the RMI remote object onthe remote host. See the -n option for the jstatd com-
mand. OOUUTTPPUUTT FFOORRMMAATTThe output of the jps command follows the following pattern:
llvvmmiidd [[ [[ ccllaassssnnaammee || JJAARRffiilleennaammee || ""UUnnkknnoowwnn""]] [[ aarrgg** ]] [[ jjvvmmaarrgg** ]] ]] Where all output tokens are separated by white space. An arg that includes embedded white space will introduce ambiguity when attempting to map arguments to their actual positional parameters.NNOOTTEE- You are advised not to write scripts to parse jps output since
the format may change in future releases. If you choose to writescripts that parse jps output, expect to modify them for future
releases of this tool. EEXXAAMMPPLLEESSThis section provides examples of the jps command.
Listing the instrumented JVMs on the local host: jjppss 1188002277 JJaavvaa22DDeemmoo..JJAARR 1188003322 jjppss 1188000055 jjssttaatt Listing 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 also includes the -l option to output the long form of the
class names or JAR file names.jjppss -ll rreemmoottee..ddoommaaiinn
33000022 //oopptt//jj22ssddkk11..55..00//ddeemmoo//jjffcc//JJaavvaa22DD//JJaavvaa22DDeemmoo..JJAARR 22885577 ssuunn..ttoooollss..jjssttaattdd..jjssttaattddListing the instrumented JVMs on a remote host with a non-default port
for the RMI registry:This example assumes that the jstatd server, with an internal RMI reg-
istry bound to port 2002, is running on the remote host. This examplealso uses the -m option to include the arguments passed to the main
method of each of the listed Java applications.jjppss -mm rreemmoottee..ddoommaaiinn::22000022
33000022 //oopptt//jj22ssddkk11..55..00//ddeemmoo//jjffcc//JJaavvaa22DD//JJaavvaa22DDeemmoo..JJAARR33110022 ssuunn..ttoooollss..jjssttaattdd..jjssttaattdd -pp 22000022
SEE ALSO
jjaavvaa(1) jjssttaatt(1) jjssttaattdd(1) rrmmiirreeggiissttrryy(1)13 June 2004 jps(1)