Run class in Jar file
If you have a jar file called
myJar.jar located in /myfolder and you want to use the class called
myClass from it, how do you go about doing it from the command line?
I thought it would be to go into the directory and say
java -cp myJar.jar.myClass but that isn't working. Any help would be appreciated.
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.jaris located, then you can do:
On Unix or Linux platforms:
java -cp /location_of_jar/myjar.jar com.mypackage.myClass
java -cp c:\location_of_jar\myjar.jar com.mypackage.myClass
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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.jaror
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
Assuming you are in the directory where
myJar.jar file is and that
myClass has a
public static void main() method on it:
You use the following command line:
java -cp ./myJar.jar myClass
myJar.jaris in the current path, note that
.isn't in the current path on most systems. A fully qualified path is preferred here as well.
myClassis a fully qualified package path to the class, the example assumes that
myClassis in the default package which is bad practice, if it is in a nested package it would be
This is the right way to execute a
.jar, and whatever one class in that
.jar should have
main() and the following are the parameters to it :
java -DLB="uk" -DType="CLIENT_IND" -jar com.fbi.rrm.rrm-batchy-1.5.jar