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jps(1)                                                                                                jps(1)



NAME
       jps - Java Virtual Machine Process Status Tool

SYNOPSIS
       jps [options] [hostid]

DESCRIPTION
       The  jps  tool  lists the instrumented 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.

       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 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 system. 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 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  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 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 princi-pal principal
       pal running the command. The command will only list the JVMs  for  which  the  principle  has  access
       rights as determined by operating system specific access control mechanisms.

       NOTE - 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.

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 the communications protocol, port
                      number, and other implementation specific data.

OPTIONS
       The jps command supports a number of options that modify the output of the  command.   These  options
       are subject to change or removal in the future.

       -q             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.

       -m             Output the arguments passed to the main method. The output may be  null  for  embedded
                      JVMs.

       -l             Output the full package name for the application's main class or the full path name to
                      the application's JAR file.

       -v             Output the arguments passed to the JVM.

       -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).

       -Joption       Pass  option  to  the  java  launcher called by javac. 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 written 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 and a hostname is  not  speci-fied, specified,
                      fied,  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.

       hostname       A hostname or IP address indicating 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.  Other-wise, Otherwise,
                      wise,  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.

       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 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 white space will
       introduce ambiguity when attempting to map arguments to their actual positional 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 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.

              jps -l remote.domain
              3002 /opt/j2sdk1.5.0/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/j2sdk1.5.0/demo/jfc/Java2D/Java2Demo.JAR
              3102 sun.tools.jstatd.jstatd -p 2002

SEE ALSO
       Java (1) jstat (1) jstatd (1) rmiregistry (1)



                                                13 June 2004                                          jps(1)