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man jps

jps(1) jps(1)

Name jps – Java Virtual Machine Process Status Tool

SYNOPSIS jps [ options ] [ hostid ]

PARAMETERS options 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[指示] the communications protocol, port number, and other implementation specific data.

DESCRIPTION The jps tool lists the instrumented【手段，工具】 HotSpot Java Virtual Machines (JVMs) on the target system. The tool is limited to reporting information on JVMs for which it has the access permissions[许可，权限].

If jps is run without specifying a hostid, it will look for instrumented 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【呈现】 to be running on the target host.

The jps command will report the local VM identifier, or lvmid, for each instrumented JVM found on the target sys‐ tem. The lvmid is typically, but not necessarily, the operating system’s process identifier for the JVM process. With no options, jps 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[省略；遗漏；删除；疏忽] the class’s package information or the JAR files path information.

The jps command uses the java launcher to find the class name and arguments passed to the main method. If the tar‐ get 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 jps 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 permissions granted to the principal running the command. The command will only list the JVMs for which the principle[原理，原则] has access rights as determined by operating system specific access control mechanisms[机制；机构].

NOTE: This utility[实用；效用；公共设施；功用] is unsupported and may not be available in future versions of the JDK. It is not currently available on Windows 98 and Windows ME platforms.

OPTIONS The jps command supports a number of options that modify the output of the command. These options are subject to change or removal[免职；移动；排除；搬迁] in the future.

-q Suppress【抑制；镇压；废止】 the output of the class name, JAR file name, and arguments passed to the main method, producing only a list of local VM identifiers.

lester@lester-ThinkPad-T410:~/study/jps$ jps -q 3007 5405 6703 3545

-m Output the arguments passed to the main method. The output may be null for embedded[嵌入式的；植入的；内含的] JVMs. lester@lester-ThinkPad-T410:~/study/jps$ jps -m 3007 5405 Jstat -gcutil -h5 -t 3007 1s 6731 Jps -m 3545 HighUS

-l Output the full package name for the application’s main class or the full path name to the application’s JAR file. lester@lester-ThinkPad-T410:~/study/jps$ jps -l 6755 sun.tools.jps.Jps 3007 5405 sun.tools.jstat.Jstat 3545 bezier.HighUS lester@lester-ThinkPad-T410:~/study/jps

-v Output the arguments passed to the JVM. lester@lester-ThinkPad-T410:~/study/jps$ jps -v 3007 -Dosgi.requiredJavaVersion=1.5 -Dhelp.lucene.tokenizer=standard -XX:PermSize=512m -XX:+DisableExplicitGC -XX:+UserParNewGC -XX:+UserConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=80 -XX:+UseCMSInitiatingOccupancyOnly -XX:+PrintGCDetails -xx:+PrintGCTimeStamps -Xloggc:/home/lester/develop/eclipse/lester_gc_log -Xms512m -Xmx512m -XX:MaxPermSize=256m 5405 Jstat -Denv.class.path=:.:/home/lester/develop/jdk1.6.0_37/lib -Dapplication.home=/home/lester/develop/jdk1.6.0_37 -Xms8m 6787 Jps -Denv.class.path=:.:/home/lester/develop/jdk1.6.0_37/lib -Dapplication.home=/home/lester/develop/jdk1.6.0_37 -Xms8m 3545 HighUS -Dfile.encoding=UTF-8

-V Output the arguments passed to the JVM through the flags file (the .hotspotrc file or the file specified by the -XX:Flags=<filename> argument). lester@lester-ThinkPad-T410:~/study/jps$ jps -V 3007 5405 Jstat 6817 Jps 3545 HighUS

-Joption Pass option to the java launcher called by jps. For example, -J-Xms48m sets the startup memory to 48 megabytes. It is a common convention for -J to pass options to the underlying VM executing applications writ‐ ten in Java.

HOST IDENTIFIER The host identifier, or hostid is a string that indicates the target system. The syntax of the hostid string largely corresponds to the syntax of a URI:

[protocol:][[//]hostname][:port][/servername]

protocol The communications protocol. If the protocol is omitted【遗漏，省略】 and a hostname is not specified, the default pro‐ tocol is a platform specific[特定的], optimized【最优】, local protocol. If the protocol is omitted and a hostname is specified[规定的；详细说明的], then the default protocol is rmi.

hostname A hostname or IP address indicating[表明；指示] the target host. If hostname is omitted, then the target host is the local host.

port The default port for communicating with the remote server. If the hostname is omitted or the protocol specifies 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 rmireg‐ istry 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 representing the name of the RMI remote object on the remote host. See the -n option for the jstatd(1) command.

OUTPUT FORMAT The output of the jps command follows the following pattern:

lvmid [ [ classname | JARfilename | “Unknown”] [ arg* ] [ jvmarg* ] ]

Where all output tokens are separated by white space. An arg that includes embedded【嵌入式的；植入的；内含的】 white space will introduce ambiguity[含糊；不明确] when attempting to map arguments to their actual positional【位置的；地位的】 parameters.

NOTE: You are advised not to write scripts to parse jps output since the format may change in future releases. If you choose to write scripts that parse jps output, expect to modify them for future releases of this tool.

EXAMPLES This section provides examples of the jps command.

Listing the instrumented JVMs on the local host:

jps

18027 Java2Demo.JAR

18032 jps

18005 jstat

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 rmireg‐ istry 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.

jps -l remote.domain

3002 /opt/jdk1.5.0/demo/jfc/Java2D/Java2Demo.JAR

2857 sun.tools.jstatd.jstatd

Listing 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 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/jdk1.5.0/demo/jfc/Java2D/Java2Demo.JAR

3102 sun.tools.jstatd.jstatd -p 2002

SEE ALSO o java(1) – the Java Application Launcher

o jstat(1) – the Java virtual machine Statistics Monitoring Tool

o jstatd(1) – the jstat daemon

o rmiregistry(1) – the Java Remote Object Registry

06 Apr 2010 jps(1)

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