How to open/run .jar file (double-click not working)?

Question

I can\'t open or run my .jar file.

I just installed java, but I tried to open the .jar with other programs first, so the double-click defaults to something else and

Answer 1

You must create a manifest file and specify your class that has the main method. you can build your jar file with manifest file as a parameter.

jar cfm MyJar.jar Manifest.txt MyPackage/*.class

Manifest-Version: 1.0

Archiver-Version: Plexus Archiver

Created-By: Apache Maven

Built-By: Cakes

Build-Jdk: 1.6.0_04

Main-Class: com.foo.App