If you have the Java Runtime Environment installed, and the JAR file is executable, it should open with a double-click. Sometimes, you might see a pop-up to choose which app to run the file.

How to Configure Chrome to Open JNLP Files. Java Network Launching Protocol, or JNLP files, are used for launching Java programs and Web applets over the Internet or company intranet. While some ...

The following command enables you to run any Java JAR file on the command line: java -jar jarfilename.jar To use the JAR file opener that comes when you install Java with the JDK, just issue the ...