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Updated on 2025-03-02

Use jps command to view detailed guide to Java processes

Introduction: jpsIt is a good assistant for Java developers and system administrators. It simplifies the process of Java process monitoring and makes it easy to quickly check the running status of the application. By rationally utilizing the parameters it provides, troubleshooting, performance monitoring and daily management tasks can be efficiently carried out to ensure the stable operation of Java applications.

In Java development and operation and maintenance scenarios,jpsIt is a very practical command line tool for quickly viewing all running Java Virtual Machine (JVM) processes in the current system. It is part of the Java Platform, Standard Edition Development Kit (JDK), and is mainly used to monitor and manage the running status of Java applications. Here is how to use it effectivelyjpsCommands to view detailed guide to Java processes.

How to use jps command

Prerequisites

  • Install JDK: Make sure that your system has Java Development Kit (JDK) installed becausejpsThe tool is built into JDK.
  • Environment variable configuration:make sureJAVA_HOMEThe environment variable has been set, and%JAVA_HOME%\bin(Windows system) or$JAVA_HOME/bin(Unix/Linux system) is added to the system's PATH variable so that it can be called directly from the command linejps。

Basic use

Open the command line terminal (command prompt on Windows or terminal on Linux/Mac), enterjpsOrder and press Enter. This lists all Java processes started by the current user, showing the process ID (PID) of each process and the short name of its main class, for example:

12345 MainClass
67890 AnotherApp

Here,12345and67890They are the PIDs of two Java processes, andMainClassandAnotherAppIt is the main class name corresponding to these processes.

Use with parameters

jpsThere are also some optional parameters to customize the output information, although they are relatively few, but sufficient to meet basic monitoring needs:

  • -q: Silent mode, only output PID, no class name is displayed.
  • -m: Displays the parameters of the main method passed to the main class when each Java process is started.
  • -l: Displays the complete class name, including the package name.
  • -v: Displays the parameters passed to the JVM.

For example, usejps -mvThe command will display the PID, full class name and corresponding JVM parameters of each Java process, which is particularly useful for debugging and performance analysis.

Find specific processes

If multiple Java processes are running in the system and you only want to focus on a specific application, you can combine pipeline commands (e.g.grepIn Unix/Linux systems) further filter the output:

jps -l | grep MyApplication

This will only show the IncludeMyApplicationString Java process information helps you quickly locate target processes.

Things to note

  • Permissions issues: On some operating systems, non-root users may not be able to see Java process information started by other users. If you need to monitor all users' Java processes, you may need to run them with administrator privilegesjps。
  • Performance impact:AlthoughjpsResource consumption is very low, and frequent use or execution on high-load systems may still have a minor impact on performance.
  • Cross-platform differences:althoughjpsIt is available on most Unix-like systems and Windows, but differences in command line environments can lead to some subtle usage experiences, such as path separators and reference rules for command line parameters.

in conclusion

jpsIt is a good assistant for Java developers and system administrators. It simplifies the process of Java process monitoring and makes it easy to quickly check the running status of the application. By rationally utilizing the parameters it provides, troubleshooting, performance monitoring and daily management tasks can be efficiently carried out to ensure the stable operation of Java applications.

The above is the detailed guide to using the jps command to view Java processes. For more information about viewing Java processes by jps, please follow my other related articles!