So you have created a java application that use .JAR libraries,But you need to put all the stuff into a single JAR ! That’s when the One-JAR comes to your aid.
What is One-JAR?
One-JAR lets you package a Java application together with its dependency Jars into a single executable Jar file.
You can download and read more information about it here : http://one-jar.sourceforge.net/
How to use it : download “one-jar-boot-x.xx.jar” from http://one-jar.sourceforge.net/index.php?page=downloads&file=downloads