Run class in Jar file

Use java -cp myjar.jar com.mypackage.myClass.

If the class is not in a package then simply java -cp myjar.jar myClass.
If you are not within the directory where myJar.jar is located, then you can do:
1. On Unix or Linux platforms:
  java -cp /location_of_jar/myjar.jar com.mypackage.myClass
2. On Windows:
  java -cp c:\location_of_jar\myjar.jar com.mypackage.myClass

You want:

java -cp myJar.jar myClass

The Documentation gives the following example:

C:> java -classpath C:\java\MyClasses\myclasses.jar utility.myapp.Cool

java command-line jar

There are two types of JAR files available in Java:

Runnable/Executable jar file which contains manifest file.To run a Runnable jar you can use java -jar fileName.jar or java -jar -classpath abc.jar fileName.jar
Simple jar file that does not contain a manifest file so you simply run your main class by giving its path java -cp ./fileName.jar MainClass

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