Thursday, February 10, 2011

Use of jps Command?

Good Day Friends..
if u want to know about the currently running JAVA processes here is a command


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 principal 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.

No comments:

Post a Comment