The File Extensions Database

.JNLP File Extension

  • Developer by: Oracle
  • Category: Web Files
  • Format: XML

What is an .JNLP file?

.JNLP is Java Web Start File

A JNLP file is created in the Java Network Launching Protocol (JNLP) format. It contains information such as the remote address for downloading a Java program (.JAR file) and the initial class to run. JNLP files are used for launching and managing Java programs over a network or on the web (e.g., an applet in a web browser).

JNLP files are saved in an XML format and can be viewed or edited with a text editor. They can be double-clicked to run the program if the Java Runtime Environment (JRE) is installed.

NOTE: The JRE includes Java Web Start technology, which opens JNLP files and runs the specified instructions.

Programs that open Java Web Start File
Oracle Java Web Start
Oracle Java Web Start
Oracle Java Web Start

How to solve problems with JNLP files

  • Associate the JNLP file extension with the correct application. On :
    Windows: Right click on any JNLP file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.JNLP files". Mac: Right click (or Ctrl-click) the JNLP file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .JNLP is Java Web Start File. Because only the current version supports the latest JNLP file format. Search, therefore, e.g. on the Oracle manufacturer website after an available .JNLP is Java Web Start File update.
  • To make sure that your JNLP file is not corrupted or virus-infected, get the file again and scan it with antivirus software.