Run class in Jar file

Question

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

User · Answer

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

User · Answer

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   Where    myJar jar is in the current path  note that   isn t in the current path on most systems  A fully qualified path is preferred here as well  myClass is a fully qualified package path to the class  the example assumes that myClass is in the default package which is bad practice  if it is in a nested package it would be com mycompany mycode myClass

User · Answer

You want   java -cp myJar jar myClass   The Documentation gives the following example   C  gt  java -classpath C  java MyClasses myclasses jar utility myapp Cool

User · Answer

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

User · Answer

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    On Unix or Linux platforms   java -cp  location of jar myjar jar com mypackage myClass On Windows   java -cp c  location of jar myjar jar com mypackage myClass

[java] Run class in Jar file

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