What is jrun.exe?

The genuine jrun.exe file is a software component of JRun Application Server by Macromedia.
A Java server framework application, Jrun starts with your browser or associated program that requires its use. It is an application server that allows the execution of java applets within a given framework. Jrun was discontinued in 2005 and is no longer supported. Macromedia was a software developer and flash provider that existed from 1992 until 2005, when it was purchased by Adobe.

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the jrun.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for jrun.exe related errors

Jrun.exe file information

The process known as JRun JAR Launcher or JAR Launcher belongs to software Macromedia JRun Application Server by Macromedia (

Description: Jrun.exe is not essential for the Windows OS and causes relatively few problems. The jrun.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 65,536 bytes (72% of all occurrences), 53,248 bytes or 61,440 bytes. 
The program has no visible window. It is not a Windows core file. The process listens for or sends data on open ports to a LAN or the Internet. Therefore the technical security rating is 59% dangerous; however you should also read the user reviews.

Uninstalling this variant: There is a possibility to uninstall Macromedia ColdFusion MX 7 or Adobe ColdFusion 8 from your computer using the Control Panel applet Uninstall a Program, consult Macromedia’s Customer Service or look for a new, improved version.

Recommended: Identify jrun.exe related errors

Important: Some malware camouflages itself as jrun.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the jrun.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

something to do with coldfusion
  Mystical Quinn  
Java Applet used by Macromedia Products, closing it will cause these applications to fail or report an error. Harmless enough, Just wish it did`nt use so much memory
  Si UK  
J2EE application server for ColdFusion MX
It keeps rebooting the system, can be masked by 3rd party
takes to 99% of cpu
This is used to run the J2EE App Server for CFMX (ColdFusion)
  Alex Richards   (further information)
jrun.exe is an instance of a jsp application server.
ColdFusion Launcher, Harmless.... but eats up system resources like a starved fat man. stopping the process is also harmless, unless you are trying to use coldfusion
Part of ColdFusion MX 6.1
  IT Mgr at a CFMX-based ASP   (further information)
jrun.exe is a process belonging to Macromedia ColdFusion Server and is described is the JAR Launcher.
  salim   (further information)
part of coldfusion MX
This files is also part of malicious software and it runs upto 4 copies simultaneneously, within hidden Iexplorer as well as in system areas this then creates random numbered .exe files which log and take control of internet browsers major memory hog
jrun.exe is the ColdFusion server running in a JRun instance. Essential to run ColdFusion applications when a web page is written in ColdFusion

Rating chart

Summary: Average user rating of jrun.exe: based on 15 votes with 14 user comments. 10 users think jrun.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous. One user suspects danger. 2 users think jrun.exe is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving jrun issues

A clean and tidy computer is the key requirement for avoiding problems with jrun. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the jrun.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

jrun.exe [all]