jps tool

jps (Java Virtual Machine Process Status Tool) is a small utility provided with the JDK to display information about all currently running JVM processes.

Basic Usage

Entering the jps command in the command line will list the PIDs and simple descriptions of all Java processes that the current user has permission to access:

jps

Example output:

12345 Jps
67890 MyApp
13579 AnotherApp

The numbers listed are process IDs, followed by the corresponding Java application names.

Display More Detailed Information

Use the -v option to display the startup parameters of each Java process:

jps -v

Example output:

12345 Jps -Dapplication.home=/usr/lib/jvm/java-8-openjdk-amd64
67890 MyApp -Xmx1024m
13579 AnotherApp -Xms512m -Xmx1024m

Display Class Names and Arguments

Use the -l option to display the main class name or Jar file name of each Java process:

jps -l

Example output:

12345 sun.tools.jps.Jps
67890 com.example.MyApp
13579 /path/to/anotherapp.jar

Display Full Command Line

Use the -m option to display the main class name and arguments of each Java process:

jps -m

Example output:

12345 Jps
67890 MyApp arg1 arg2
13579 AnotherApp config.xml

Display All Information

Use the -vm combination option to display all detailed information, including class names, arguments, and JVM parameters:

jps -vml